configure.in - security/openssh-library - Rivoreo Source Code Repositories

 AC_INIT(ssh.c)

 AC_CONFIG_HEADER(config.h)
 AC_PROG_CC
 AC_CANONICAL_HOST

 # Checks for programs.
 AC_PROG_CPP
 AC_PROG_RANLIB
 AC_PROG_INSTALL
 AC_CHECK_PROG(AR, ar, ar)
 AC_PATH_PROG(PERL, perl)
 AC_SUBST(PERL)

 if test -z "$LD" ; then
 	LD=$CC
 fi
 AC_SUBST(LD)

 # C Compiler features
 AC_C_INLINE
 if test "$GCC" = "yes"; then
 	CFLAGS="$CFLAGS -Wall"
 fi

 # Check for some target-specific stuff
 case "$host" in
 *-*-aix*)
 	AFS_LIBS="-lld"
 	CFLAGS="$CFLAGS -I/usr/local/include"
 	LDFLAGS="$LDFLAGS -L/usr/local/lib"
 	if test "$LD" != "gcc" -a -z "$blibpath"; then
 		blibpath="/usr/lib:/lib:/usr/local/lib"
 	fi
 	AC_DEFINE(BROKEN_GETADDRINFO)
 	;;
 *-*-hpux10*)
 	if test -z "$GCC"; then
 		CFLAGS="$CFLAGS -Aa"
 	fi
 	CFLAGS="$CFLAGS -D_HPUX_SOURCE"
 	CFLAGS="$CFLAGS -I/usr/local/include"
 	LDFLAGS="$LDFLAGS -L/usr/local/lib"
 	AC_DEFINE(IPADDR_IN_DISPLAY)
 	AC_DEFINE(USE_UTMPX)
 	AC_MSG_CHECKING(for HPUX trusted system password database)
 	if test -f /tcb/files/auth/system/default; then
 		AC_MSG_RESULT(yes)
 		AC_DEFINE(HAVE_HPUX_TRUSTED_SYSTEM_PW)
 		LIBS="$LIBS -lsec"
 		AC_MSG_WARN([This configuration is untested])
 	else
 		AC_MSG_RESULT(no)
 		AC_DEFINE(DISABLE_SHADOW)
 	fi
 	MANTYPE='$(CATMAN)'
 	mansubdir=cat
 	;;
 *-*-irix5*)
 	CFLAGS="$CFLAGS -I/usr/local/include"
 	LDFLAGS="$LDFLAGS -L/usr/local/lib"
 	MANTYPE='$(CATMAN)'
 	no_libsocket=1
 	no_libnsl=1
 	;;
 *-*-irix6*)
 	CFLAGS="$CFLAGS -I/usr/local/include"
 	LDFLAGS="$LDFLAGS -L/usr/local/lib"
 	MANTYPE='$(CATMAN)'
 	AC_MSG_WARN([*** Irix 6.x is not tested, please report you experiences *** ])
 	no_libsocket=1
 	no_libnsl=1
 	;;
 *-*-linux*)
 	no_dev_ptmx=1
 	AC_DEFINE(DONT_TRY_OTHER_AF)
 	inet6_default_4in6=yes
 	;;
 *-*-netbsd*)
 	need_dash_r=1
 	;;
 *-*-solaris*)
 	CFLAGS="$CFLAGS -I/usr/local/include"
 	LDFLAGS="$LDFLAGS -L/usr/local/lib -R/usr/local/lib -L/usr/ucblib -R/usr/ucblib"
 	need_dash_r=1
 	AC_DEFINE(USE_UTMPX)
 	;;
 *-*-sysv*)
 	CFLAGS="$CFLAGS -I/usr/local/include"
 	LDFLAGS="$LDFLAGS -L/usr/local/lib"
 	AC_DEFINE(USE_UTMPX)
 	MANTYPE='$(CATMAN)'
 	mansubdir=cat
 	LIBS="$LIBS -lgen -lsocket"
 	;;
 esac

 # Checks for libraries.
 AC_CHECK_LIB(z, deflate, ,AC_MSG_ERROR([*** zlib missing - please install first ***]))
 AC_CHECK_LIB(util, login, AC_DEFINE(HAVE_LIBUTIL_LOGIN) LIBS="$LIBS -lutil")

 if test -z "$no_libsocket" ; then
 	AC_CHECK_LIB(nsl, yp_match, , )
 fi
 if test -z "$no_libnsl" ; then
 	AC_CHECK_LIB(socket, main, , )
 fi

 # Checks for header files.
 AC_CHECK_HEADERS(bstring.h endian.h lastlog.h login.h maillock.h netdb.h netgroup.h paths.h poll.h pty.h shadow.h security/pam_appl.h sys/bitypes.h sys/bsdtty.h sys/cdefs.h sys/poll.h sys/select.h sys/stropts.h sys/sysmacros.h sys/time.h sys/ttcompat.h stddef.h util.h utmp.h utmpx.h)

 # Checks for library functions.
 AC_CHECK_FUNCS(arc4random bindresvport_af clock freeaddrinfo gai_strerror getaddrinfo getnameinfo getrusage innetgr md5_crypt mkdtemp openpty rresvport_af setenv seteuid setlogin setproctitle setreuid snprintf strlcat strlcpy updwtmpx vsnprintf vhangup _getpty)

 AC_CHECK_FUNC(login,
 	[AC_DEFINE(HAVE_LOGIN)],
 	[AC_CHECK_LIB(bsd, login, [LIBS="$LIBS -lbsd"; AC_DEFINE(HAVE_LOGIN)])]
 )

 AC_CHECK_FUNC(daemon,
 	[AC_DEFINE(HAVE_DAEMON)],
 	[AC_CHECK_LIB(bsd, daemon, [LIBS="$LIBS -lbsd"; AC_DEFINE(HAVE_DAEMON)])]
 )

 AC_CHECK_FUNC(getpagesize,
 	[AC_DEFINE(HAVE_GETPAGESIZE)],
 	[AC_CHECK_LIB(ucb, getpagesize, [LIBS="$LIBS -lucb"; AC_DEFINE(HAVE_GETPAGESIZE)])]
 )

 AC_ARG_WITH(pam,
 	[  --without-pam           Disable PAM support ],
 	[
 		if test "x$withval" = "xno" ; then
 			no_pam=1
 			AC_DEFINE(DISABLE_PAM)
 		fi
 	]
 )
 if test -z "$no_pam" -a "x$ac_cv_header_security_pam_appl_h" = "xyes" ; then
 	AC_CHECK_LIB(dl, dlopen, , )
 	LIBS="$LIBS -lpam"

 	# Check PAM strerror arguments (old PAM)
 	AC_MSG_CHECKING([whether pam_strerror takes only one argument])
 	AC_TRY_COMPILE(
 		[
 			#include <stdlib.h>
 			#include <security/pam_appl.h>
 		],
 		[(void)pam_strerror((pam_handle_t *)NULL, -1);],
 		[AC_MSG_RESULT(no)],
 		[
 			AC_DEFINE(HAVE_OLD_PAM)
 			AC_MSG_RESULT(yes)
 		]
 	)
 fi

 # The big search for OpenSSL
 AC_ARG_WITH(ssl-dir,
 	[  --with-ssl-dir=PATH     Specify path to OpenSSL installation ],
 	[
 		if test "x$withval" != "$xno" ; then
 			tryssldir=$withval
 		fi
 	]
 )

 saved_LIBS="$LIBS"
 saved_LDFLAGS="$LDFLAGS"
 saved_CFLAGS="$CFLAGS"
 if test "x$prefix" != "xNONE" ; then
 	tryssldir="$tryssldir $prefix"
 fi
 AC_MSG_CHECKING([for OpenSSL/SSLeay directory])
 for ssldir in "" $tryssldir /usr/local/openssl /usr/lib/openssl /usr/local/ssl /usr/lib/ssl /usr/local /usr/pkg /opt /opt/openssl ; do
 	if test ! -z "$ssldir" ; then
 		LDFLAGS="$saved_LDFLAGS -L$ssldir/lib -L$ssldir"
 		CFLAGS="$saved_CFLAGS -I$ssldir/include"
 		if test ! -z "$need_dash_r" ; then
 			LDFLAGS="$LDFLAGS -R$ssldir/lib -R$ssldir"
 		fi
 	else
 		LDFLAGS="$saved_LDFLAGS"
 	fi

 	for WANTS_RSAREF in "" 1 ; do

 		if test -z "$WANTS_RSAREF" ; then
 			LIBS="$saved_LIBS -lcrypto"
 		else
 			LIBS="$saved_LIBS -lcrypto -lRSAglue -lrsaref"
 		fi

 		AC_TRY_RUN(
 			[
 				#include <openssl/rsa.h>
 				#include <openssl/bn.h>
 				#include <openssl/sha.h>
 				int main(void)
 				{
 					RSA *key; char a[2048],b[2048];;
 					memset(a, 0, sizeof(a));memset(b, 0, sizeof(b));
 					RAND_add(a, sizeof(a), sizeof(a));
 					key=RSA_generate_key(32,3,NULL,NULL);
 					if (key==NULL) return(1);
 					return(-1==RSA_private_decrypt(RSA_size(key),a,b,key,RSA_NO_PADDING));
 				}
 			],
 			[
 				AC_DEFINE(HAVE_OPENSSL)
 				found_crypto=1
 				break;
 			], []
 		)
 	done

 	if test ! -z "$found_crypto" ; then
 		break;
 	fi
 done

 if test -z "$found_crypto" ; then
 	AC_MSG_ERROR([Could not find working SSLeay / OpenSSL libraries, please install])
 fi
 if test -z "$ssldir" ; then
 	ssldir="(system)"
 else
 	CFLAGS="$saved_CFLAGS -I$ssldir/include"
 	LDFLAGS="$saved_LDFLAGS -L$ssldir/lib -L$ssldir"
 	if test ! -z "$need_dash_r" ; then
 		LDFLAGS="$LDFLAGS -R$ssldir/lib -R$ssldir"
 	fi
 	if test ! -z "$blibpath" ; then
 		blibpath="$blibpath:$ssldir:$ssldir/lib"
 	fi
 fi
 if test -z "$WANTS_RSAREF" ; then
 	LIBS="$saved_LIBS -lcrypto"
 else
 	LIBS="$saved_LIBS -lcrypto -lRSAglue -lrsaref"
 fi
 AC_MSG_RESULT($ssldir)

 # Checks for data types
 AC_CHECK_SIZEOF(char, 1)
 AC_CHECK_SIZEOF(short int, 2)
 AC_CHECK_SIZEOF(int, 4)
 AC_CHECK_SIZEOF(long int, 4)
 AC_CHECK_SIZEOF(long long int, 8)

 # More checks for data types
 AC_MSG_CHECKING([for intXX_t types])
 AC_TRY_COMPILE(
 	[#include <sys/types.h>],
 	[int8_t a; int16_t b; int32_t c; a = b = c = 1;],
 	[
 		AC_DEFINE(HAVE_INTXX_T)
 		AC_MSG_RESULT(yes)
 		have_intxx_t=1
 	],
 	[AC_MSG_RESULT(no)]
 )

 AC_MSG_CHECKING([for u_intXX_t types])
 AC_TRY_COMPILE(
 	[#include <sys/types.h>],
 	[u_int8_t a; u_int16_t b; u_int32_t c; a = b = c = 1;],
 	[
 		AC_DEFINE(HAVE_U_INTXX_T)
 		AC_MSG_RESULT(yes)
 		have_u_intxx_t=1
 	],
 	[AC_MSG_RESULT(no)]
 )

 if test -z "$have_u_intxx_t" -o -z "$have_intxx_t" -a \
            "x$ac_cv_header_sys_bitypes_h" = "xyes"
 then
 	AC_MSG_CHECKING([for intXX_t and u_intXX_t types in sys/bitypes.h])
 	AC_TRY_COMPILE(
 		[#include <sys/bitypes.h>],
 		[
 			int8_t a; int16_t b; int32_t c;
 			u_int8_t e; u_int16_t f; u_int32_t g;
 			a = b = c = e = f = g = 1;
 		],
 		[
 			AC_DEFINE(HAVE_U_INTXX_T)
 			AC_DEFINE(HAVE_INTXX_T)
 			AC_MSG_RESULT(yes)
 		],
 		[AC_MSG_RESULT(no)]
 	)
 fi

 if test -z "$have_u_intxx_t" ; then
 	AC_MSG_CHECKING([for uintXX_t types])
 	AC_TRY_COMPILE(
 		[#include <sys/types.h>],
 		[uint8_t a; uint16_t b; uint32_t c; a = b = c = 1;],
 		[
 			AC_DEFINE(HAVE_UINTXX_T)
 			AC_MSG_RESULT(yes)
 		],
 		[AC_MSG_RESULT(no)]
 	)
 fi

 AC_MSG_CHECKING([for socklen_t])
 AC_TRY_COMPILE(
 	[
 		#include <sys/types.h>
 		#include <sys/socket.h>
 	],
 	[socklen_t foo; foo = 1235;],
 	[
 		AC_DEFINE(HAVE_SOCKLEN_T)
 		AC_MSG_RESULT(yes)
 	],
 	[AC_MSG_RESULT(no)]
 )

 AC_MSG_CHECKING([for size_t])
 AC_TRY_COMPILE(
 	[#include <sys/types.h>],
 	[size_t foo; foo = 1235;],
 	[
 		AC_DEFINE(HAVE_SIZE_T)
 		AC_MSG_RESULT(yes)
 	],
 	[AC_MSG_RESULT(no)]
 )

 AC_MSG_CHECKING([for struct sockaddr_storage])
 AC_TRY_COMPILE(
 	[
 		#include <sys/types.h>
 		#include <sys/socket.h>
 	],
 	[struct sockaddr_storage s;],
 	[
 		AC_DEFINE(HAVE_STRUCT_SOCKADDR_STORAGE)
 		AC_MSG_RESULT(yes)
 	],
 	[AC_MSG_RESULT(no)]
 )

 AC_MSG_CHECKING([for struct sockaddr_in6])
 AC_TRY_COMPILE(
 	[#include <netinet/in.h>],
 	[struct sockaddr_in6 s; s.sin6_family = 0;],
 	[
 		AC_DEFINE(HAVE_STRUCT_SOCKADDR_IN6)
 		AC_MSG_RESULT(yes)
 	],
 	[AC_MSG_RESULT(no)]
 )

 AC_MSG_CHECKING([for struct in6_addr])
 AC_TRY_COMPILE(
 	[#include <netinet/in.h>],
 	[struct in6_addr s; s.s6_addr[0] = 0;],
 	[
 		AC_DEFINE(HAVE_STRUCT_IN6_ADDR)
 		AC_MSG_RESULT(yes)
 	],
 	[AC_MSG_RESULT(no)]
 )

 AC_MSG_CHECKING([for struct addrinfo])
 AC_TRY_COMPILE(
 	[
 		#include <sys/types.h>
 		#include <sys/socket.h>
 		#include <netdb.h>
 	],
 	[struct addrinfo s; s.ai_flags = AI_PASSIVE;],
 	[
 		AC_DEFINE(HAVE_STRUCT_ADDRINFO)
 		AC_MSG_RESULT(yes)
 	],
 	[AC_MSG_RESULT(no)]
 )

 # Checks for structure members
 AC_MSG_CHECKING([whether utmp.h has ut_host field])
 AC_EGREP_HEADER(ut_host, utmp.h,
 	[AC_DEFINE(HAVE_HOST_IN_UTMP) AC_MSG_RESULT(yes); ],
 	[AC_MSG_RESULT(no)]
 )
 AC_MSG_CHECKING([whether utmpx.h has ut_host field])
 AC_EGREP_HEADER(ut_host, utmpx.h,
 	[AC_DEFINE(HAVE_HOST_IN_UTMPX) AC_MSG_RESULT(yes); ],
 	[AC_MSG_RESULT(no)]
 )
 AC_MSG_CHECKING([whether utmpx.h has syslen field])
 AC_EGREP_HEADER(syslen, utmpx.h,
 	[AC_DEFINE(HAVE_SYSLEN_IN_UTMPX) AC_MSG_RESULT(yes); ],
 	[AC_MSG_RESULT(no)]
 )
 AC_MSG_CHECKING([whether utmp.h has ut_pid field])
 AC_EGREP_HEADER(ut_pid, utmp.h,
 	[AC_DEFINE(HAVE_PID_IN_UTMP) AC_MSG_RESULT(yes); ],
 	[AC_MSG_RESULT(no)]
 )
 AC_MSG_CHECKING([whether utmp.h has ut_type field])
 AC_EGREP_HEADER(ut_type, utmp.h,
 	[AC_DEFINE(HAVE_TYPE_IN_UTMP) AC_MSG_RESULT(yes); ],
 	[AC_MSG_RESULT(no)]
 )
 AC_MSG_CHECKING([whether utmp.h has ut_tv field])
 AC_EGREP_HEADER(ut_tv, utmp.h,
 	[AC_DEFINE(HAVE_TV_IN_UTMP) AC_MSG_RESULT(yes); ],
 	[AC_MSG_RESULT(no)]
 )
 AC_MSG_CHECKING([whether utmp.h has ut_id field])
 AC_EGREP_HEADER(ut_id, utmp.h,
 	[AC_DEFINE(HAVE_ID_IN_UTMP) AC_MSG_RESULT(yes); ],
 	[AC_MSG_RESULT(no)]
 )
 AC_MSG_CHECKING([whether utmp.h has ut_addr field])
 AC_EGREP_HEADER(ut_addr, utmp.h,
 	[AC_DEFINE(HAVE_ADDR_IN_UTMP) AC_MSG_RESULT(yes); ],
 	[AC_MSG_RESULT(no)]
 )
 AC_MSG_CHECKING([whether utmpx.h has ut_addr field])
 AC_EGREP_HEADER(ut_addr, utmpx.h,
 	[AC_DEFINE(HAVE_ADDR_IN_UTMPX) AC_MSG_RESULT(yes); ],
 	[AC_MSG_RESULT(no)]
 )
 AC_MSG_CHECKING([whether utmp.h has ut_addr_v6 field])
 AC_EGREP_HEADER(ut_addr_v6, utmp.h,
 	[AC_DEFINE(HAVE_ADDR_V6_IN_UTMP) AC_MSG_RESULT(yes); ],
 	[AC_MSG_RESULT(no)]
 )
 AC_MSG_CHECKING([whether utmpx.h has ut_addr_v6 field])
 AC_EGREP_HEADER(ut_addr_v6, utmpx.h,
 	[AC_DEFINE(HAVE_ADDR_V6_IN_UTMPX) AC_MSG_RESULT(yes); ],
 	[AC_MSG_RESULT(no)]
 )

 AC_MSG_CHECKING([whether struct sockaddr_storage has ss_family field])
 AC_TRY_COMPILE(
 	[
 		#include <sys/types.h>
 		#include <sys/socket.h>
 	],
 	[struct sockaddr_storage s; s.ss_family = 1;],
 	[
 		AC_DEFINE(HAVE_SS_FAMILY_IN_SS)
 		AC_MSG_RESULT(yes)
 	],
 	[AC_MSG_RESULT(no)]
 )
 AC_MSG_CHECKING([whether struct sockaddr_storage has __ss_family field])
 AC_TRY_COMPILE(
 	[
 		#include <sys/types.h>
 		#include <sys/socket.h>
 	],
 	[struct sockaddr_storage s; s.__ss_family = 1;],
 	[
 		AC_DEFINE(HAVE___SS_FAMILY_IN_SS)
 		AC_MSG_RESULT(yes)
 	],
 	[AC_MSG_RESULT(no)]
 )

 AC_MSG_CHECKING([whether libc defines __progname])
 AC_TRY_LINK([],
 	[extern char *__progname; printf("%s", __progname);],
 	[
 		AC_DEFINE(HAVE___PROGNAME)
 		AC_MSG_RESULT(yes)
 	],
 	[
 		AC_MSG_RESULT(no)
 	]
 )

 # Looking for programs, paths and files
 AC_ARG_WITH(rsh,
 	[  --with-rsh=PATH         Specify path to remote shell program ],
 	[
 		if test "x$withval" != "$no" ; then
 			AC_DEFINE_UNQUOTED(RSH_PATH, "$withval")
 		fi
 	],
 	[
 		AC_PATH_PROG(rsh_path, rsh)
 	]
 )

 AC_ARG_WITH(xauth,
 	[  --with-xauth=PATH       Specify path to xauth program ],
 	[
 		if test "x$withval" != "$xno" ; then
 			AC_DEFINE_UNQUOTED(XAUTH_PATH, "$withval")
 		fi
 	],
 	[
 		AC_PATH_PROG(xauth_path, xauth)
 		if test ! -z "$xauth_path" -a -x "/usr/openwin/bin/xauth" ; then
 			xauth_path="/usr/openwin/bin/xauth"
 		fi
 	]
 )

 if test ! -z "$xauth_path" ; then
 	AC_DEFINE_UNQUOTED(XAUTH_PATH, "$xauth_path")
 fi
 if test ! -z "$rsh_path" ; then
 	AC_DEFINE_UNQUOTED(RSH_PATH, "$rsh_path")
 fi

 # Check for mail directory (last resort if we cannot get it from headers)
 if test ! -z "$MAIL" ; then
 	maildir=`dirname $MAIL`
 	AC_DEFINE_UNQUOTED(MAIL_DIRECTORY, "$maildir")
 fi

 # Look for lastlog location
 AC_ARG_WITH(lastlog,
 	[  --with-lastlog=FILE     Location of lastlog file],
 	[
 		if test "x$withval" = "xno" ; then
 			AC_DEFINE(DISABLE_LASTLOG)
 		else
 			AC_DEFINE_UNQUOTED(LASTLOG_LOCATION, "$withval")
 		fi
 	],
 	[
 		AC_MSG_CHECKING([location of lastlog file])
 		for lastlog in /var/log/lastlog /var/adm/lastlog /usr/adm/lastlog  /etc/security/lastlog ; do
 			if test -f $lastlog ; then
 				gotlastlog="file"
 				break
 			fi
 			if test -d $lastlog ; then
 				gotlastlog="dir"
 				break
 			fi
 		done
 		if test -z "$gotlastlog" ; then
 			AC_MSG_RESULT(not found)
 			nolastlog=1
 		else
 			if test "x$gotlastlog" = "xdir" ; then
 				AC_MSG_RESULT(${lastlog}/)
 				AC_DEFINE(LASTLOG_IS_DIR)
 			else
 				AC_MSG_RESULT($lastlog)
 				AC_DEFINE_UNQUOTED(LASTLOG_LOCATION, "$lastlog")
 			fi
 		fi
 	]
 )

 if test ! -z "$nolastlog" ; then
 	AC_MSG_WARN([*** Disabling lastlog support *** ])
 	AC_DEFINE(DISABLE_LASTLOG)
 fi

 if test -z "$no_dev_ptmx" ; then
 	AC_CHECK_FILE("/dev/ptmx",
 		[
 			AC_DEFINE_UNQUOTED(HAVE_DEV_PTMX)
 			have_dev_ptmx=1
 		]
 	)
 fi
 AC_CHECK_FILE("/dev/ptc",
 	[
 		AC_DEFINE_UNQUOTED(HAVE_DEV_PTS_AND_PTC)
 		have_dev_ptc=1
 	]
 )

 # Options from here on. Some of these are preset by platform above

 # Check for user-specified random device, otherwise check /dev/urandom
 AC_ARG_WITH(random,
 	[  --with-random=FILE      read randomness from FILE (default=/dev/urandom)],
 	[
 		if test "x$withval" != "xno" ; then
 			RANDOM_POOL="$withval";
 			AC_DEFINE_UNQUOTED(RANDOM_POOL, "$RANDOM_POOL")
 		fi
 	],
 	[
 		# Check for random device
 		AC_CHECK_FILE("/dev/urandom",
 			[
 				RANDOM_POOL="/dev/urandom";
 				AC_SUBST(RANDOM_POOL)
 				AC_DEFINE_UNQUOTED(RANDOM_POOL, "$RANDOM_POOL")
 			]
 		)
 	]
 )

 # Check for EGD pool file
 AC_ARG_WITH(egd-pool,
 	[  --with-egd-pool=FILE    read randomness from EGD pool FILE (default none)],
 	[
 		if test "x$withval" != "xno" ; then
 			EGD_SOCKET="$withval";
 			AC_DEFINE_UNQUOTED(EGD_SOCKET, "$EGD_SOCKET")
 		fi
 	]
 )

 if test -z "$RANDOM_POOL" -a -z "$EGD_SOCKET" ; then
 	# Use these commands to collect entropy
 	AC_PATH_PROG(PROG_LS, ls)
 	AC_PATH_PROG(PROG_NETSTAT, netstat)
 	AC_PATH_PROG(PROG_ARP, arp)
 	AC_PATH_PROG(PROG_IFCONFIG, ifconfig)
 	AC_PATH_PROG(PROG_PS, ps)
 	AC_PATH_PROG(PROG_W, w)
 	AC_PATH_PROG(PROG_WHO, who)
 	AC_PATH_PROG(PROG_LAST, last)
 	AC_PATH_PROG(PROG_LASTLOG, lastlog)
 	AC_PATH_PROG(PROG_DF, df)
 	AC_PATH_PROG(PROG_VMSTAT, vmstat)
 	AC_PATH_PROG(PROG_UPTIME, uptime)
 	AC_PATH_PROG(PROG_IPCS, ipcs)
 	AC_PATH_PROG(PROG_TAIL, tail)
 	AC_PATH_PROG(PROG_LS, ls)
 	if test ! -z "$PROG_LS" ; then
 		AC_DEFINE_UNQUOTED(PROG_LS, "$PROG_LS")
 	fi
 	if test ! -z "$PROG_NETSTAT" ; then
 		AC_DEFINE_UNQUOTED(PROG_NETSTAT, "$PROG_NETSTAT")
 	fi
 	if test ! -z "$PROG_ARP" ; then
 		AC_DEFINE_UNQUOTED(PROG_ARP, "$PROG_ARP")
 	fi
 	if test ! -z "$PROG_IFCONFIG" ; then
 		AC_DEFINE_UNQUOTED(PROG_IFCONFIG, "$PROG_IFCONFIG")
 	fi
 	if test ! -z "$PROG_PS" ; then
 		AC_DEFINE_UNQUOTED(PROG_PS, "$PROG_PS")
 	fi
 	if test ! -z "$PROG_W" ; then
 		AC_DEFINE_UNQUOTED(PROG_W, "$PROG_W")
 	fi
 	if test ! -z "$PROG_WHO" ; then
 		AC_DEFINE_UNQUOTED(PROG_WHO, "$PROG_WHO")
 	fi
 	if test ! -z "$PROG_LAST" ; then
 		AC_DEFINE_UNQUOTED(PROG_LAST, "$PROG_LAST")
 	fi
 	if test ! -z "$PROG_LASTLOG" ; then
 		AC_DEFINE_UNQUOTED(PROG_LASTLOG, "$PROG_LASTLOG")
 	fi
 	if test ! -z "$PROG_DF" ; then
 		AC_DEFINE_UNQUOTED(PROG_DF, "$PROG_DF")
 	fi
 	if test ! -z "$PROG_VMSTAT" ; then
 		AC_DEFINE_UNQUOTED(PROG_VMSTAT, "$PROG_VMSTAT")
 	fi
 	if test ! -z "$PROG_UPTIME" ; then
 		AC_DEFINE_UNQUOTED(PROG_UPTIME, "$PROG_UPTIME")
 	fi
 	if test ! -z "$PROG_UPTIME" ; then
 		AC_DEFINE_UNQUOTED(PROG_UPTIME, "$PROG_UPTIME")
 	fi
 	if test ! -z "$PROG_TAIL" ; then
 		AC_DEFINE_UNQUOTED(PROG_TAIL, "$PROG_TAIL")
 	fi
 fi

 AC_ARG_WITH(catman,
 	[  --with-catman=man|cat   Install preformatted manpages[no]],
 	[
 		MANTYPE='$(CATMAN)'
 		if test x"$withval" != x"yes" ; then
 		   mansubdir=$withval
 		else
 		   mansubdir=cat
 		fi
 	], [
 		if test -z "$MANTYPE" ; then
 			MANTYPE='$(TROFFMAN)'
 			mansubdir=man
 		fi
 	]
 )
 AC_SUBST(MANTYPE)
 AC_SUBST(mansubdir)

 # Check whether user wants Kerberos support
 AC_ARG_WITH(kerberos4,
 	[  --with-kerberos4=PATH   Enable Kerberos 4 support],
 	[
 		if test "x$withval" != "xno" ; then

 			if test "x$withval" != "$xyes" ; then
 				CFLAGS="$CFLAGS -I${withval}/include"
 				LDFLAGS="$LDFLAGS -L${withval}/lib"
 				if test ! -z "$need_dash_r" ; then
 					LDFLAGS="$LDFLAGS -R${withval}/lib"
 				fi
 				if test ! -z "$blibpath" ; then
 					blibpath="$blibpath:${withval}/lib"
 				fi
 			else
 				if test -d /usr/include/kerberosIV ; then
 					CFLAGS="$CFLAGS -I/usr/include/kerberosIV"
 				fi
 			fi

 			AC_CHECK_HEADERS(krb.h)
 			AC_CHECK_LIB(krb, main)
 			if test "$ac_cv_header_krb_h" != yes; then
 				AC_MSG_WARN([Cannot find krb.h, build may fail])
 			fi
 			if test "$ac_cv_lib_krb_main" != yes; then
 				AC_MSG_WARN([Cannot find libkrb, build may fail])
 			fi

 			KLIBS="-lkrb -ldes"
 			AC_CHECK_LIB(resolv, dn_expand, , )
 			KRB4=yes
 			AC_DEFINE(KRB4)
 		fi
 	]
 )

 # Check whether user wants AFS support
 AC_ARG_WITH(afs,
 	[  --with-afs=PATH         Enable AFS support],
 	[
 		if test "x$withval" != "xno" ; then

 			if test "x$withval" != "$xyes" ; then
 				CFLAGS="$CFLAGS -I${withval}/include"
 				LFLAGS="$LFLAGS -L${withval}/lib"
 			fi

 			if test -z "$KRB4" ; then
 				AC_MSG_WARN([AFS requires Kerberos IV support, build may fail])
 			fi

 			LIBS="$LIBS -lkafs"
 			if test ! -z "$AFS_LIBS" ; then
 				LIBS="$LIBS $AFS_LIBS"
 			fi
 			AC_DEFINE(AFS)
 		fi
 	]
 )
 LIBS="$LIBS $KLIBS"

 # Check whether user wants S/Key support
 AC_ARG_WITH(skey,
 	[  --with-skey             Enable S/Key support],
 	[
 		if test "x$withval" != "xno" ; then
 			AC_DEFINE(SKEY)
 			LIBS="$LIBS -lskey"
 		fi
 	]
 )

 # Check whether user wants TCP wrappers support
 AC_ARG_WITH(tcp-wrappers,
 	[  --with-tcp-wrappers     Enable tcpwrappers support],
 	[
 		if test "x$withval" != "xno" ; then
 			saved_LIBS="$LIBS"
 			LIBS="$LIBS -lwrap"
 			AC_MSG_CHECKING(for libwrap)
 			AC_TRY_LINK(
 				[
 					#include <tcpd.h>
 					int deny_severity = 0, allow_severity = 0;
 				],
 				[hosts_access(0);],
 				[
 					AC_MSG_RESULT(yes)
 					AC_DEFINE(LIBWRAP)
 				],
 				[
 					AC_MSG_RESULT(no)
 					AC_MSG_WARN([*** libwrap missing - tcpwrapper support disabled ***])
 					LIBS="$saved_LIBS"
 				]
 			)
 		fi
 	]
 )

 # Check whether to enable MD5 passwords
 AC_ARG_WITH(md5-passwords,
 	[  --with-md5-passwords    Enable use of MD5 passwords],
 	[
 		if test "x$withval" != "xno" ; then
 			AC_DEFINE(HAVE_MD5_PASSWORDS)
 		fi
 	]
 )

 # Check whether to enable utmpx support
 AC_ARG_WITH(utmpx,
 	[  --with-utmpx            Enable utmpx support],
 	[
 		if test "x$withval" != "xno" ; then
 			AC_DEFINE(USE_UTMPX)
 		fi
 	]
 )

 # Whether to disable shadow password support
 AC_ARG_WITH(shadow,
 	[  --without-shadow        Disable shadow password support],
 	[
 		if test "x$withval" = "xno" ; then
 			AC_DEFINE(DISABLE_SHADOW)
 		fi
 	]
 )

 # Use ip address instead of hostname in $DISPLAY
 AC_ARG_WITH(ipaddr-display,
 	[  --with-ipaddr-display   Use ip address instead of hostname in \$DISPLAY],
 	[
 		if test "x$withval" = "xno" ; then
 			AC_DEFINE(IPADDR_IN_DISPLAY)
 		fi
 	]
 )

 # Whether to mess with the default path
 AC_ARG_WITH(default-path,
 	[  --with-default-path=PATH Specify default \$PATH environment for server],
 	[
 		if test "x$withval" != "xno" ; then
 			AC_DEFINE_UNQUOTED(USER_PATH, "$withval")
 		fi
 	]
 )

 # Whether to force IPv4 by default (needed on broken glibc Linux)
 AC_ARG_WITH(ipv4-default,
 	[  --with-ipv4-default     Use IPv4 by connections unless '-6' specified],
 	[
 		if test "x$withval" != "xno" ; then
 			AC_DEFINE(IPV4_DEFAULT)
 		fi
 	]
 )

 AC_MSG_CHECKING([to convert IPv4 in IPv6-mapped addresses])
 AC_ARG_WITH(4in6,
 	[  --with-4in6             Check for and convert IPv4 in IPv6 mapped addresses],
 	[
 		if test "x$withval" != "xno" ; then
 			AC_MSG_RESULT(yes)
 			AC_DEFINE(IPV4_IN_IPV6)
 		else
 			AC_MSG_RESULT(no)
 		fi
 	],[
 		if test "x$inet6_default_4in6" = "xyes"; then
 			AC_MSG_RESULT([yes (default)])
 			AC_DEFINE(IPV4_IN_IPV6)
 		else
 			AC_MSG_RESULT([no (default)])
 		fi
 	]
 )

 # Where to place sshd.pid
 piddir=/var/run
 AC_ARG_WITH(pid-dir,
 	[  --with-pid-dir=PATH     Specify location of ssh.pid file],
 	[
 		if test "x$withval" != "xno" ; then
 			piddir=$withval
 		fi
 	]
 )
 AC_DEFINE_UNQUOTED(PIDDIR, "$piddir")
 AC_SUBST(piddir)

 if test ! -z "$blibpath" ; then
 	LDFLAGS="$LDFLAGS -blibpath:$blibpath"
 	AC_MSG_WARN([Please check and edit -blibpath in LDFLAGS in Makefile])
 fi

 AC_OUTPUT(Makefile)
	AC_INIT(ssh.c)

	AC_CONFIG_HEADER(config.h)
	AC_PROG_CC
	AC_CANONICAL_HOST

	# Checks for programs.
	AC_PROG_CPP
	AC_PROG_RANLIB
	AC_PROG_INSTALL
	AC_CHECK_PROG(AR, ar, ar)
	AC_PATH_PROG(PERL, perl)
	AC_SUBST(PERL)

	if test -z "$LD" ; then
	LD=$CC
	fi
	AC_SUBST(LD)

	# C Compiler features
	AC_C_INLINE
	if test "$GCC" = "yes"; then
	CFLAGS="$CFLAGS -Wall"
	fi

	# Check for some target-specific stuff
	case "$host" in
	--aix*)
	AFS_LIBS="-lld"
	CFLAGS="$CFLAGS -I/usr/local/include"
	LDFLAGS="$LDFLAGS -L/usr/local/lib"
	if test "$LD" != "gcc" -a -z "$blibpath"; then
	blibpath="/usr/lib:/lib:/usr/local/lib"
	fi
	AC_DEFINE(BROKEN_GETADDRINFO)
	;;
	--hpux10*)
	if test -z "$GCC"; then
	CFLAGS="$CFLAGS -Aa"
	fi
	CFLAGS="$CFLAGS -D_HPUX_SOURCE"
	CFLAGS="$CFLAGS -I/usr/local/include"
	LDFLAGS="$LDFLAGS -L/usr/local/lib"
	AC_DEFINE(IPADDR_IN_DISPLAY)
	AC_DEFINE(USE_UTMPX)
	AC_MSG_CHECKING(for HPUX trusted system password database)
	if test -f /tcb/files/auth/system/default; then
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_HPUX_TRUSTED_SYSTEM_PW)
	LIBS="$LIBS -lsec"
	AC_MSG_WARN([This configuration is untested])
	else
	AC_MSG_RESULT(no)
	AC_DEFINE(DISABLE_SHADOW)
	fi
	MANTYPE='$(CATMAN)'
	mansubdir=cat
	;;
	--irix5*)
	CFLAGS="$CFLAGS -I/usr/local/include"
	LDFLAGS="$LDFLAGS -L/usr/local/lib"
	MANTYPE='$(CATMAN)'
	no_libsocket=1
	no_libnsl=1
	;;
	--irix6*)
	CFLAGS="$CFLAGS -I/usr/local/include"
	LDFLAGS="$LDFLAGS -L/usr/local/lib"
	MANTYPE='$(CATMAN)'
	AC_MSG_WARN([* Irix 6.x is not tested, please report you experiences * ])
	no_libsocket=1
	no_libnsl=1
	;;
	--linux*)
	no_dev_ptmx=1
	AC_DEFINE(DONT_TRY_OTHER_AF)
	inet6_default_4in6=yes
	;;
	--netbsd*)
	need_dash_r=1
	;;
	--solaris*)
	CFLAGS="$CFLAGS -I/usr/local/include"
	LDFLAGS="$LDFLAGS -L/usr/local/lib -R/usr/local/lib -L/usr/ucblib -R/usr/ucblib"
	need_dash_r=1
	AC_DEFINE(USE_UTMPX)
	;;
	--sysv*)
	CFLAGS="$CFLAGS -I/usr/local/include"
	LDFLAGS="$LDFLAGS -L/usr/local/lib"
	AC_DEFINE(USE_UTMPX)
	MANTYPE='$(CATMAN)'
	mansubdir=cat
	LIBS="$LIBS -lgen -lsocket"
	;;
	esac

	# Checks for libraries.
	AC_CHECK_LIB(z, deflate, ,AC_MSG_ERROR([* zlib missing - please install first *]))
	AC_CHECK_LIB(util, login, AC_DEFINE(HAVE_LIBUTIL_LOGIN) LIBS="$LIBS -lutil")

	if test -z "$no_libsocket" ; then
	AC_CHECK_LIB(nsl, yp_match, , )
	fi
	if test -z "$no_libnsl" ; then
	AC_CHECK_LIB(socket, main, , )
	fi

	# Checks for header files.
	AC_CHECK_HEADERS(bstring.h endian.h lastlog.h login.h maillock.h netdb.h netgroup.h paths.h poll.h pty.h shadow.h security/pam_appl.h sys/bitypes.h sys/bsdtty.h sys/cdefs.h sys/poll.h sys/select.h sys/stropts.h sys/sysmacros.h sys/time.h sys/ttcompat.h stddef.h util.h utmp.h utmpx.h)

	# Checks for library functions.
	AC_CHECK_FUNCS(arc4random bindresvport_af clock freeaddrinfo gai_strerror getaddrinfo getnameinfo getrusage innetgr md5_crypt mkdtemp openpty rresvport_af setenv seteuid setlogin setproctitle setreuid snprintf strlcat strlcpy updwtmpx vsnprintf vhangup _getpty)

	AC_CHECK_FUNC(login,
	[AC_DEFINE(HAVE_LOGIN)],
	[AC_CHECK_LIB(bsd, login, [LIBS="$LIBS -lbsd"; AC_DEFINE(HAVE_LOGIN)])]
	)

	AC_CHECK_FUNC(daemon,
	[AC_DEFINE(HAVE_DAEMON)],
	[AC_CHECK_LIB(bsd, daemon, [LIBS="$LIBS -lbsd"; AC_DEFINE(HAVE_DAEMON)])]
	)

	AC_CHECK_FUNC(getpagesize,
	[AC_DEFINE(HAVE_GETPAGESIZE)],
	[AC_CHECK_LIB(ucb, getpagesize, [LIBS="$LIBS -lucb"; AC_DEFINE(HAVE_GETPAGESIZE)])]
	)

	AC_ARG_WITH(pam,
	[ --without-pam Disable PAM support ],
	[
	if test "x$withval" = "xno" ; then
	no_pam=1
	AC_DEFINE(DISABLE_PAM)
	fi
	]
	)
	if test -z "$no_pam" -a "x$ac_cv_header_security_pam_appl_h" = "xyes" ; then
	AC_CHECK_LIB(dl, dlopen, , )
	LIBS="$LIBS -lpam"

	# Check PAM strerror arguments (old PAM)
	AC_MSG_CHECKING([whether pam_strerror takes only one argument])
	AC_TRY_COMPILE(
	[
	#include <stdlib.h>
	#include <security/pam_appl.h>
	],
	[(void)pam_strerror((pam_handle_t *)NULL, -1);],
	[AC_MSG_RESULT(no)],
	[
	AC_DEFINE(HAVE_OLD_PAM)
	AC_MSG_RESULT(yes)
	]
	)
	fi

	# The big search for OpenSSL
	AC_ARG_WITH(ssl-dir,
	[ --with-ssl-dir=PATH Specify path to OpenSSL installation ],
	[
	if test "x$withval" != "$xno" ; then
	tryssldir=$withval
	fi
	]
	)

	saved_LIBS="$LIBS"
	saved_LDFLAGS="$LDFLAGS"
	saved_CFLAGS="$CFLAGS"
	if test "x$prefix" != "xNONE" ; then
	tryssldir="$tryssldir $prefix"
	fi
	AC_MSG_CHECKING([for OpenSSL/SSLeay directory])
	for ssldir in "" $tryssldir /usr/local/openssl /usr/lib/openssl /usr/local/ssl /usr/lib/ssl /usr/local /usr/pkg /opt /opt/openssl ; do
	if test ! -z "$ssldir" ; then
	LDFLAGS="$saved_LDFLAGS -L$ssldir/lib -L$ssldir"
	CFLAGS="$saved_CFLAGS -I$ssldir/include"
	if test ! -z "$need_dash_r" ; then
	LDFLAGS="$LDFLAGS -R$ssldir/lib -R$ssldir"
	fi
	else
	LDFLAGS="$saved_LDFLAGS"
	fi

	for WANTS_RSAREF in "" 1 ; do

	if test -z "$WANTS_RSAREF" ; then
	LIBS="$saved_LIBS -lcrypto"
	else
	LIBS="$saved_LIBS -lcrypto -lRSAglue -lrsaref"
	fi

	AC_TRY_RUN(
	[
	#include <openssl/rsa.h>
	#include <openssl/bn.h>
	#include <openssl/sha.h>
	int main(void)
	{
	RSA *key; char a[2048],b[2048];;
	memset(a, 0, sizeof(a));memset(b, 0, sizeof(b));
	RAND_add(a, sizeof(a), sizeof(a));
	key=RSA_generate_key(32,3,NULL,NULL);
	if (key==NULL) return(1);
	return(-1==RSA_private_decrypt(RSA_size(key),a,b,key,RSA_NO_PADDING));
	}
	],
	[
	AC_DEFINE(HAVE_OPENSSL)
	found_crypto=1
	break;
	], []
	)
	done

	if test ! -z "$found_crypto" ; then
	break;
	fi
	done

	if test -z "$found_crypto" ; then
	AC_MSG_ERROR([Could not find working SSLeay / OpenSSL libraries, please install])
	fi
	if test -z "$ssldir" ; then
	ssldir="(system)"
	else
	CFLAGS="$saved_CFLAGS -I$ssldir/include"
	LDFLAGS="$saved_LDFLAGS -L$ssldir/lib -L$ssldir"
	if test ! -z "$need_dash_r" ; then
	LDFLAGS="$LDFLAGS -R$ssldir/lib -R$ssldir"
	fi
	if test ! -z "$blibpath" ; then
	blibpath="$blibpath:$ssldir:$ssldir/lib"
	fi
	fi
	if test -z "$WANTS_RSAREF" ; then
	LIBS="$saved_LIBS -lcrypto"
	else
	LIBS="$saved_LIBS -lcrypto -lRSAglue -lrsaref"
	fi
	AC_MSG_RESULT($ssldir)

	# Checks for data types
	AC_CHECK_SIZEOF(char, 1)
	AC_CHECK_SIZEOF(short int, 2)
	AC_CHECK_SIZEOF(int, 4)
	AC_CHECK_SIZEOF(long int, 4)
	AC_CHECK_SIZEOF(long long int, 8)

	# More checks for data types
	AC_MSG_CHECKING([for intXX_t types])
	AC_TRY_COMPILE(
	[#include <sys/types.h>],
	[int8_t a; int16_t b; int32_t c; a = b = c = 1;],
	[
	AC_DEFINE(HAVE_INTXX_T)
	AC_MSG_RESULT(yes)
	have_intxx_t=1
	],
	[AC_MSG_RESULT(no)]
	)

	AC_MSG_CHECKING([for u_intXX_t types])
	AC_TRY_COMPILE(
	[#include <sys/types.h>],
	[u_int8_t a; u_int16_t b; u_int32_t c; a = b = c = 1;],
	[
	AC_DEFINE(HAVE_U_INTXX_T)
	AC_MSG_RESULT(yes)
	have_u_intxx_t=1
	],
	[AC_MSG_RESULT(no)]
	)

	if test -z "$have_u_intxx_t" -o -z "$have_intxx_t" -a \
	"x$ac_cv_header_sys_bitypes_h" = "xyes"
	then
	AC_MSG_CHECKING([for intXX_t and u_intXX_t types in sys/bitypes.h])
	AC_TRY_COMPILE(
	[#include <sys/bitypes.h>],
	[
	int8_t a; int16_t b; int32_t c;
	u_int8_t e; u_int16_t f; u_int32_t g;
	a = b = c = e = f = g = 1;
	],
	[
	AC_DEFINE(HAVE_U_INTXX_T)
	AC_DEFINE(HAVE_INTXX_T)
	AC_MSG_RESULT(yes)
	],
	[AC_MSG_RESULT(no)]
	)
	fi

	if test -z "$have_u_intxx_t" ; then
	AC_MSG_CHECKING([for uintXX_t types])
	AC_TRY_COMPILE(
	[#include <sys/types.h>],
	[uint8_t a; uint16_t b; uint32_t c; a = b = c = 1;],
	[
	AC_DEFINE(HAVE_UINTXX_T)
	AC_MSG_RESULT(yes)
	],
	[AC_MSG_RESULT(no)]
	)
	fi

	AC_MSG_CHECKING([for socklen_t])
	AC_TRY_COMPILE(
	[
	#include <sys/types.h>
	#include <sys/socket.h>
	],
	[socklen_t foo; foo = 1235;],
	[
	AC_DEFINE(HAVE_SOCKLEN_T)
	AC_MSG_RESULT(yes)
	],
	[AC_MSG_RESULT(no)]
	)

	AC_MSG_CHECKING([for size_t])
	AC_TRY_COMPILE(
	[#include <sys/types.h>],
	[size_t foo; foo = 1235;],
	[
	AC_DEFINE(HAVE_SIZE_T)
	AC_MSG_RESULT(yes)
	],
	[AC_MSG_RESULT(no)]
	)

	AC_MSG_CHECKING([for struct sockaddr_storage])
	AC_TRY_COMPILE(
	[
	#include <sys/types.h>
	#include <sys/socket.h>
	],
	[struct sockaddr_storage s;],
	[
	AC_DEFINE(HAVE_STRUCT_SOCKADDR_STORAGE)
	AC_MSG_RESULT(yes)
	],
	[AC_MSG_RESULT(no)]
	)

	AC_MSG_CHECKING([for struct sockaddr_in6])
	AC_TRY_COMPILE(
	[#include <netinet/in.h>],
	[struct sockaddr_in6 s; s.sin6_family = 0;],
	[
	AC_DEFINE(HAVE_STRUCT_SOCKADDR_IN6)
	AC_MSG_RESULT(yes)
	],
	[AC_MSG_RESULT(no)]
	)

	AC_MSG_CHECKING([for struct in6_addr])
	AC_TRY_COMPILE(
	[#include <netinet/in.h>],
	[struct in6_addr s; s.s6_addr[0] = 0;],
	[
	AC_DEFINE(HAVE_STRUCT_IN6_ADDR)
	AC_MSG_RESULT(yes)
	],
	[AC_MSG_RESULT(no)]
	)

	AC_MSG_CHECKING([for struct addrinfo])
	AC_TRY_COMPILE(
	[
	#include <sys/types.h>
	#include <sys/socket.h>
	#include <netdb.h>
	],
	[struct addrinfo s; s.ai_flags = AI_PASSIVE;],
	[
	AC_DEFINE(HAVE_STRUCT_ADDRINFO)
	AC_MSG_RESULT(yes)
	],
	[AC_MSG_RESULT(no)]
	)

	# Checks for structure members
	AC_MSG_CHECKING([whether utmp.h has ut_host field])
	AC_EGREP_HEADER(ut_host, utmp.h,
	[AC_DEFINE(HAVE_HOST_IN_UTMP) AC_MSG_RESULT(yes); ],
	[AC_MSG_RESULT(no)]
	)
	AC_MSG_CHECKING([whether utmpx.h has ut_host field])
	AC_EGREP_HEADER(ut_host, utmpx.h,
	[AC_DEFINE(HAVE_HOST_IN_UTMPX) AC_MSG_RESULT(yes); ],
	[AC_MSG_RESULT(no)]
	)
	AC_MSG_CHECKING([whether utmpx.h has syslen field])
	AC_EGREP_HEADER(syslen, utmpx.h,
	[AC_DEFINE(HAVE_SYSLEN_IN_UTMPX) AC_MSG_RESULT(yes); ],
	[AC_MSG_RESULT(no)]
	)
	AC_MSG_CHECKING([whether utmp.h has ut_pid field])
	AC_EGREP_HEADER(ut_pid, utmp.h,
	[AC_DEFINE(HAVE_PID_IN_UTMP) AC_MSG_RESULT(yes); ],
	[AC_MSG_RESULT(no)]
	)
	AC_MSG_CHECKING([whether utmp.h has ut_type field])
	AC_EGREP_HEADER(ut_type, utmp.h,
	[AC_DEFINE(HAVE_TYPE_IN_UTMP) AC_MSG_RESULT(yes); ],
	[AC_MSG_RESULT(no)]
	)
	AC_MSG_CHECKING([whether utmp.h has ut_tv field])
	AC_EGREP_HEADER(ut_tv, utmp.h,
	[AC_DEFINE(HAVE_TV_IN_UTMP) AC_MSG_RESULT(yes); ],
	[AC_MSG_RESULT(no)]
	)
	AC_MSG_CHECKING([whether utmp.h has ut_id field])
	AC_EGREP_HEADER(ut_id, utmp.h,
	[AC_DEFINE(HAVE_ID_IN_UTMP) AC_MSG_RESULT(yes); ],
	[AC_MSG_RESULT(no)]
	)
	AC_MSG_CHECKING([whether utmp.h has ut_addr field])
	AC_EGREP_HEADER(ut_addr, utmp.h,
	[AC_DEFINE(HAVE_ADDR_IN_UTMP) AC_MSG_RESULT(yes); ],
	[AC_MSG_RESULT(no)]
	)
	AC_MSG_CHECKING([whether utmpx.h has ut_addr field])
	AC_EGREP_HEADER(ut_addr, utmpx.h,
	[AC_DEFINE(HAVE_ADDR_IN_UTMPX) AC_MSG_RESULT(yes); ],
	[AC_MSG_RESULT(no)]
	)
	AC_MSG_CHECKING([whether utmp.h has ut_addr_v6 field])
	AC_EGREP_HEADER(ut_addr_v6, utmp.h,
	[AC_DEFINE(HAVE_ADDR_V6_IN_UTMP) AC_MSG_RESULT(yes); ],
	[AC_MSG_RESULT(no)]
	)
	AC_MSG_CHECKING([whether utmpx.h has ut_addr_v6 field])
	AC_EGREP_HEADER(ut_addr_v6, utmpx.h,
	[AC_DEFINE(HAVE_ADDR_V6_IN_UTMPX) AC_MSG_RESULT(yes); ],
	[AC_MSG_RESULT(no)]
	)

	AC_MSG_CHECKING([whether struct sockaddr_storage has ss_family field])
	AC_TRY_COMPILE(
	[
	#include <sys/types.h>
	#include <sys/socket.h>
	],
	[struct sockaddr_storage s; s.ss_family = 1;],
	[
	AC_DEFINE(HAVE_SS_FAMILY_IN_SS)
	AC_MSG_RESULT(yes)
	],
	[AC_MSG_RESULT(no)]
	)
	AC_MSG_CHECKING([whether struct sockaddr_storage has __ss_family field])
	AC_TRY_COMPILE(
	[
	#include <sys/types.h>
	#include <sys/socket.h>
	],
	[struct sockaddr_storage s; s.__ss_family = 1;],
	[
	AC_DEFINE(HAVE___SS_FAMILY_IN_SS)
	AC_MSG_RESULT(yes)
	],
	[AC_MSG_RESULT(no)]
	)

	AC_MSG_CHECKING([whether libc defines __progname])
	AC_TRY_LINK([],
	[extern char *__progname; printf("%s", __progname);],
	[
	AC_DEFINE(HAVE___PROGNAME)
	AC_MSG_RESULT(yes)
	],
	[
	AC_MSG_RESULT(no)
	]
	)

	# Looking for programs, paths and files
	AC_ARG_WITH(rsh,
	[ --with-rsh=PATH Specify path to remote shell program ],
	[
	if test "x$withval" != "$no" ; then
	AC_DEFINE_UNQUOTED(RSH_PATH, "$withval")
	fi
	],
	[
	AC_PATH_PROG(rsh_path, rsh)
	]
	)

	AC_ARG_WITH(xauth,
	[ --with-xauth=PATH Specify path to xauth program ],
	[
	if test "x$withval" != "$xno" ; then
	AC_DEFINE_UNQUOTED(XAUTH_PATH, "$withval")
	fi
	],
	[
	AC_PATH_PROG(xauth_path, xauth)
	if test ! -z "$xauth_path" -a -x "/usr/openwin/bin/xauth" ; then
	xauth_path="/usr/openwin/bin/xauth"
	fi
	]
	)

	if test ! -z "$xauth_path" ; then
	AC_DEFINE_UNQUOTED(XAUTH_PATH, "$xauth_path")
	fi
	if test ! -z "$rsh_path" ; then
	AC_DEFINE_UNQUOTED(RSH_PATH, "$rsh_path")
	fi

	# Check for mail directory (last resort if we cannot get it from headers)
	if test ! -z "$MAIL" ; then
	maildir=`dirname $MAIL`
	AC_DEFINE_UNQUOTED(MAIL_DIRECTORY, "$maildir")
	fi

	# Look for lastlog location
	AC_ARG_WITH(lastlog,
	[ --with-lastlog=FILE Location of lastlog file],
	[
	if test "x$withval" = "xno" ; then
	AC_DEFINE(DISABLE_LASTLOG)
	else
	AC_DEFINE_UNQUOTED(LASTLOG_LOCATION, "$withval")
	fi
	],
	[
	AC_MSG_CHECKING([location of lastlog file])
	for lastlog in /var/log/lastlog /var/adm/lastlog /usr/adm/lastlog /etc/security/lastlog ; do
	if test -f $lastlog ; then
	gotlastlog="file"
	break
	fi
	if test -d $lastlog ; then
	gotlastlog="dir"
	break
	fi
	done
	if test -z "$gotlastlog" ; then
	AC_MSG_RESULT(not found)
	nolastlog=1
	else
	if test "x$gotlastlog" = "xdir" ; then
	AC_MSG_RESULT(${lastlog}/)
	AC_DEFINE(LASTLOG_IS_DIR)
	else
	AC_MSG_RESULT($lastlog)
	AC_DEFINE_UNQUOTED(LASTLOG_LOCATION, "$lastlog")
	fi
	fi
	]
	)

	if test ! -z "$nolastlog" ; then
	AC_MSG_WARN([* Disabling lastlog support * ])
	AC_DEFINE(DISABLE_LASTLOG)
	fi

	if test -z "$no_dev_ptmx" ; then
	AC_CHECK_FILE("/dev/ptmx",
	[
	AC_DEFINE_UNQUOTED(HAVE_DEV_PTMX)
	have_dev_ptmx=1
	]
	)
	fi
	AC_CHECK_FILE("/dev/ptc",
	[
	AC_DEFINE_UNQUOTED(HAVE_DEV_PTS_AND_PTC)
	have_dev_ptc=1
	]
	)

	# Options from here on. Some of these are preset by platform above

	# Check for user-specified random device, otherwise check /dev/urandom
	AC_ARG_WITH(random,
	[ --with-random=FILE read randomness from FILE (default=/dev/urandom)],
	[
	if test "x$withval" != "xno" ; then
	RANDOM_POOL="$withval";
	AC_DEFINE_UNQUOTED(RANDOM_POOL, "$RANDOM_POOL")
	fi
	],
	[
	# Check for random device
	AC_CHECK_FILE("/dev/urandom",
	[
	RANDOM_POOL="/dev/urandom";
	AC_SUBST(RANDOM_POOL)
	AC_DEFINE_UNQUOTED(RANDOM_POOL, "$RANDOM_POOL")
	]
	)
	]
	)

	# Check for EGD pool file
	AC_ARG_WITH(egd-pool,
	[ --with-egd-pool=FILE read randomness from EGD pool FILE (default none)],
	[
	if test "x$withval" != "xno" ; then
	EGD_SOCKET="$withval";
	AC_DEFINE_UNQUOTED(EGD_SOCKET, "$EGD_SOCKET")
	fi
	]
	)

	if test -z "$RANDOM_POOL" -a -z "$EGD_SOCKET" ; then
	# Use these commands to collect entropy
	AC_PATH_PROG(PROG_LS, ls)
	AC_PATH_PROG(PROG_NETSTAT, netstat)
	AC_PATH_PROG(PROG_ARP, arp)
	AC_PATH_PROG(PROG_IFCONFIG, ifconfig)
	AC_PATH_PROG(PROG_PS, ps)
	AC_PATH_PROG(PROG_W, w)
	AC_PATH_PROG(PROG_WHO, who)
	AC_PATH_PROG(PROG_LAST, last)
	AC_PATH_PROG(PROG_LASTLOG, lastlog)
	AC_PATH_PROG(PROG_DF, df)
	AC_PATH_PROG(PROG_VMSTAT, vmstat)
	AC_PATH_PROG(PROG_UPTIME, uptime)
	AC_PATH_PROG(PROG_IPCS, ipcs)
	AC_PATH_PROG(PROG_TAIL, tail)
	AC_PATH_PROG(PROG_LS, ls)
	if test ! -z "$PROG_LS" ; then
	AC_DEFINE_UNQUOTED(PROG_LS, "$PROG_LS")
	fi
	if test ! -z "$PROG_NETSTAT" ; then
	AC_DEFINE_UNQUOTED(PROG_NETSTAT, "$PROG_NETSTAT")
	fi
	if test ! -z "$PROG_ARP" ; then
	AC_DEFINE_UNQUOTED(PROG_ARP, "$PROG_ARP")
	fi
	if test ! -z "$PROG_IFCONFIG" ; then
	AC_DEFINE_UNQUOTED(PROG_IFCONFIG, "$PROG_IFCONFIG")
	fi
	if test ! -z "$PROG_PS" ; then
	AC_DEFINE_UNQUOTED(PROG_PS, "$PROG_PS")
	fi
	if test ! -z "$PROG_W" ; then
	AC_DEFINE_UNQUOTED(PROG_W, "$PROG_W")
	fi
	if test ! -z "$PROG_WHO" ; then
	AC_DEFINE_UNQUOTED(PROG_WHO, "$PROG_WHO")
	fi
	if test ! -z "$PROG_LAST" ; then
	AC_DEFINE_UNQUOTED(PROG_LAST, "$PROG_LAST")
	fi
	if test ! -z "$PROG_LASTLOG" ; then
	AC_DEFINE_UNQUOTED(PROG_LASTLOG, "$PROG_LASTLOG")
	fi
	if test ! -z "$PROG_DF" ; then
	AC_DEFINE_UNQUOTED(PROG_DF, "$PROG_DF")
	fi
	if test ! -z "$PROG_VMSTAT" ; then
	AC_DEFINE_UNQUOTED(PROG_VMSTAT, "$PROG_VMSTAT")
	fi
	if test ! -z "$PROG_UPTIME" ; then
	AC_DEFINE_UNQUOTED(PROG_UPTIME, "$PROG_UPTIME")
	fi
	if test ! -z "$PROG_UPTIME" ; then
	AC_DEFINE_UNQUOTED(PROG_UPTIME, "$PROG_UPTIME")
	fi
	if test ! -z "$PROG_TAIL" ; then
	AC_DEFINE_UNQUOTED(PROG_TAIL, "$PROG_TAIL")
	fi
	fi

	AC_ARG_WITH(catman,
	[ --with-catman=man\|cat Install preformatted manpages[no]],
	[
	MANTYPE='$(CATMAN)'
	if test x"$withval" != x"yes" ; then
	mansubdir=$withval
	else
	mansubdir=cat
	fi
	], [
	if test -z "$MANTYPE" ; then
	MANTYPE='$(TROFFMAN)'
	mansubdir=man
	fi
	]
	)
	AC_SUBST(MANTYPE)
	AC_SUBST(mansubdir)

	# Check whether user wants Kerberos support
	AC_ARG_WITH(kerberos4,
	[ --with-kerberos4=PATH Enable Kerberos 4 support],
	[
	if test "x$withval" != "xno" ; then

	if test "x$withval" != "$xyes" ; then
	CFLAGS="$CFLAGS -I${withval}/include"
	LDFLAGS="$LDFLAGS -L${withval}/lib"
	if test ! -z "$need_dash_r" ; then
	LDFLAGS="$LDFLAGS -R${withval}/lib"
	fi
	if test ! -z "$blibpath" ; then
	blibpath="$blibpath:${withval}/lib"
	fi
	else
	if test -d /usr/include/kerberosIV ; then
	CFLAGS="$CFLAGS -I/usr/include/kerberosIV"
	fi
	fi

	AC_CHECK_HEADERS(krb.h)
	AC_CHECK_LIB(krb, main)
	if test "$ac_cv_header_krb_h" != yes; then
	AC_MSG_WARN([Cannot find krb.h, build may fail])
	fi
	if test "$ac_cv_lib_krb_main" != yes; then
	AC_MSG_WARN([Cannot find libkrb, build may fail])
	fi

	KLIBS="-lkrb -ldes"
	AC_CHECK_LIB(resolv, dn_expand, , )
	KRB4=yes
	AC_DEFINE(KRB4)
	fi
	]
	)

	# Check whether user wants AFS support
	AC_ARG_WITH(afs,
	[ --with-afs=PATH Enable AFS support],
	[
	if test "x$withval" != "xno" ; then

	if test "x$withval" != "$xyes" ; then
	CFLAGS="$CFLAGS -I${withval}/include"
	LFLAGS="$LFLAGS -L${withval}/lib"
	fi

	if test -z "$KRB4" ; then
	AC_MSG_WARN([AFS requires Kerberos IV support, build may fail])
	fi

	LIBS="$LIBS -lkafs"
	if test ! -z "$AFS_LIBS" ; then
	LIBS="$LIBS $AFS_LIBS"
	fi
	AC_DEFINE(AFS)
	fi
	]
	)
	LIBS="$LIBS $KLIBS"

	# Check whether user wants S/Key support
	AC_ARG_WITH(skey,
	[ --with-skey Enable S/Key support],
	[
	if test "x$withval" != "xno" ; then
	AC_DEFINE(SKEY)
	LIBS="$LIBS -lskey"
	fi
	]
	)

	# Check whether user wants TCP wrappers support
	AC_ARG_WITH(tcp-wrappers,
	[ --with-tcp-wrappers Enable tcpwrappers support],
	[
	if test "x$withval" != "xno" ; then
	saved_LIBS="$LIBS"
	LIBS="$LIBS -lwrap"
	AC_MSG_CHECKING(for libwrap)
	AC_TRY_LINK(
	[
	#include <tcpd.h>
	int deny_severity = 0, allow_severity = 0;
	],
	[hosts_access(0);],
	[
	AC_MSG_RESULT(yes)
	AC_DEFINE(LIBWRAP)
	],
	[
	AC_MSG_RESULT(no)
	AC_MSG_WARN([* libwrap missing - tcpwrapper support disabled *])
	LIBS="$saved_LIBS"
	]
	)
	fi
	]
	)

	# Check whether to enable MD5 passwords
	AC_ARG_WITH(md5-passwords,
	[ --with-md5-passwords Enable use of MD5 passwords],
	[
	if test "x$withval" != "xno" ; then
	AC_DEFINE(HAVE_MD5_PASSWORDS)
	fi
	]
	)

	# Check whether to enable utmpx support
	AC_ARG_WITH(utmpx,
	[ --with-utmpx Enable utmpx support],
	[
	if test "x$withval" != "xno" ; then
	AC_DEFINE(USE_UTMPX)
	fi
	]
	)

	# Whether to disable shadow password support
	AC_ARG_WITH(shadow,
	[ --without-shadow Disable shadow password support],
	[
	if test "x$withval" = "xno" ; then
	AC_DEFINE(DISABLE_SHADOW)
	fi
	]
	)

	# Use ip address instead of hostname in $DISPLAY
	AC_ARG_WITH(ipaddr-display,
	[ --with-ipaddr-display Use ip address instead of hostname in \$DISPLAY],
	[
	if test "x$withval" = "xno" ; then
	AC_DEFINE(IPADDR_IN_DISPLAY)
	fi
	]
	)

	# Whether to mess with the default path
	AC_ARG_WITH(default-path,
	[ --with-default-path=PATH Specify default \$PATH environment for server],
	[
	if test "x$withval" != "xno" ; then
	AC_DEFINE_UNQUOTED(USER_PATH, "$withval")
	fi
	]
	)

	# Whether to force IPv4 by default (needed on broken glibc Linux)
	AC_ARG_WITH(ipv4-default,
	[ --with-ipv4-default Use IPv4 by connections unless '-6' specified],
	[
	if test "x$withval" != "xno" ; then
	AC_DEFINE(IPV4_DEFAULT)
	fi
	]
	)

	AC_MSG_CHECKING([to convert IPv4 in IPv6-mapped addresses])
	AC_ARG_WITH(4in6,
	[ --with-4in6 Check for and convert IPv4 in IPv6 mapped addresses],
	[
	if test "x$withval" != "xno" ; then
	AC_MSG_RESULT(yes)
	AC_DEFINE(IPV4_IN_IPV6)
	else
	AC_MSG_RESULT(no)
	fi
	],[
	if test "x$inet6_default_4in6" = "xyes"; then
	AC_MSG_RESULT([yes (default)])
	AC_DEFINE(IPV4_IN_IPV6)
	else
	AC_MSG_RESULT([no (default)])
	fi
	]
	)

	# Where to place sshd.pid
	piddir=/var/run
	AC_ARG_WITH(pid-dir,
	[ --with-pid-dir=PATH Specify location of ssh.pid file],
	[
	if test "x$withval" != "xno" ; then
	piddir=$withval
	fi
	]
	)
	AC_DEFINE_UNQUOTED(PIDDIR, "$piddir")
	AC_SUBST(piddir)

	if test ! -z "$blibpath" ; then
	LDFLAGS="$LDFLAGS -blibpath:$blibpath"
	AC_MSG_WARN([Please check and edit -blibpath in LDFLAGS in Makefile])
	fi

	AC_OUTPUT(Makefile)