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

 AC_INIT(ssh.c)

 AC_CONFIG_HEADER(config.h)
 AC_CANONICAL_HOST

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

 AC_ARG_WITH(rsh,
 	[  --with-rsh=PATH         Specify path to remote shell program ],
 	[
 		if test "x$withval" != "$xno" ; 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

 dnl Checks for compiler characteristics
 if test "$GCC" = "yes"; then CFLAGS="$CFLAGS -Wall"; fi

 AC_C_INLINE

 dnl Check for OpenSSL/SSLeay directories.
 AC_MSG_CHECKING([for OpenSSL/SSLeay directory])
 for ssldir in $prefix /usr /usr/local/openssl /usr/lib/openssl /usr/local/ssl /usr/lib/ssl /usr/local $prefix /usr/pkg ; do
 	if test -f "$ssldir/include/openssl/crypto.h"; then
 		AC_DEFINE(HAVE_OPENSSL)
 		GOT_SSL="yes"
 		break
 	fi
 	if test -f "$ssldir/include/ssl/crypto.h"; then
 		AC_DEFINE(HAVE_SSL)
 		GOT_SSL="yes"
 		break
 	fi
 done
 if test -z "$GOT_SSL" ; then
 	AC_MSG_ERROR([Could not find SSLeay / OpenSSL libraries, please install])
 fi
 AC_SUBST(ssldir)
 AC_DEFINE_UNQUOTED(ssldir, "$ssldir")
 if test "$ssldir" != "/usr"; then
 	CFLAGS="$CFLAGS -I$ssldir/include"
 	LDFLAGS="$LDFLAGS -L$ssldir/lib"
 fi
 AC_MSG_RESULT($ssldir)

 dnl Check for some target-specific stuff
 case "$host" in
 *-*-aix*)
 	AFS_LIBS="-lld"
 	AC_DEFINE(BROKEN_GETADDRINFO)
 	;;
 *-*-hpux10*)
 	if test -z "$GCC"; then
 		CFLAGS="$CFLAGS -Aa"
 	fi
 	CFLAGS="$CFLAGS -D_HPUX_SOURCE"
 	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*)
 	MANTYPE='$(CATMAN)'
 	no_libsocket=1
 	no_libnsl=1
 	;;
 *-*-irix6*)
 	MANTYPE='$(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
 	;;
 *-*-netbsd*)
 	if test "$GOT_SSL" = "yes"; then
 		LDFLAGS="$LDFLAGS -R$ssldir/lib"
 	fi
 	;;
 *-*-solaris*)
 	AC_DEFINE(USE_UTMPX)
 	;;
 *-*-sysv*)
 	LIBS="$LIBS -lgen -lsocket"
 	;;
 esac

 dnl Check for RSAref library.
 AC_MSG_CHECKING([for RSAref library])
 saved_LIBS="$LIBS"
 LIBS="$saved_LIBS -lRSAglue -lrsaref"
 AC_TRY_LINK([], [],
 [AC_MSG_RESULT(yes);
  AC_DEFINE(RSAREF)],
 [AC_MSG_RESULT(no)]; LIBS="$saved_LIBS")

 dnl Checks for libraries.
 AC_CHECK_LIB(crypto, CRYPTO_lock, ,AC_MSG_ERROR([*** libcrypto missing - please install first ***]))
 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

 dnl 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)

 dnl Checks for library functions.
 AC_CHECK_FUNCS(arc4random bindresvport_af freeaddrinfo gai_strerror getaddrinfo getpagesize getnameinfo innetgr md5_crypt mkdtemp openpty rresvport_af setenv seteuid setlogin setproctitle setreuid snprintf strlcat strlcpy updwtmpx vsnprintf _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)])]
 )

 dnl 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)

 dnl More checks for data types
 AC_MSG_CHECKING([for intXX_t types])
 AC_TRY_COMPILE(
 	[#include <sys/types.h>],
 	[int16_t a; int32_t b; a = 1235; b = 1235;],
 	[
 		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_int16_t c; u_int32_t d; c = 1235; d = 1235;],
 	[
 		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>],
 		[
 			u_int16_t c; u_int32_t d;
 			int16_t e; int32_t f;
 			c = 1235; d = 1235;
 			e = 1235; f = 1235;
 		],
 		[
 			AC_DEFINE(HAVE_U_INTXX_T)
 			AC_DEFINE(HAVE_INTXX_T)
 			AC_MSG_RESULT(yes)
 		],
 		[AC_MSG_RESULT(no)]
 	)
 fi

 AC_MSG_CHECKING([for uintXX_t types])
 AC_TRY_COMPILE(
 	[#include <sys/types.h>],
 	[uint16_t c; uint32_t d; c = 1235; d = 1235;],
 	[
 		AC_DEFINE(HAVE_UINTXX_T)
 		AC_MSG_RESULT(yes)
 	],
 	[AC_MSG_RESULT(no)]
 )

 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)]
 )

 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"
 	dnl Check PAM strerror arguments
 	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

 AC_MSG_CHECKING([whether to build GNOME ssh-askpass])
 dnl Check whether user wants GNOME ssh-askpass
 AC_ARG_WITH(gnome-askpass,
 	[  --with-gnome-askpass    Build the GNOME passphrase requester (default=no)],
 	[
 		if test x$withval = xno ; then
 			GNOME_ASKPASS="";
 		else
 			GNOME_ASKPASS="gnome-ssh-askpass";
 		fi
 	])
 AC_SUBST(GNOME_ASKPASS)

 if test -z "$GNOME_ASKPASS" ; then
 	AC_MSG_RESULT(no)
 else
 	AC_MSG_RESULT(yes)
 fi

 dnl Check for user-specified random device
 AC_ARG_WITH(random,
 	[  --with-random=FILE      read randomness from FILE (default=/dev/urandom)],
 	[
 		RANDOM_POOL="$withval";
 		AC_DEFINE_UNQUOTED(RANDOM_POOL, "$RANDOM_POOL")
 	],
 	[
 		dnl Check for random device
 		AC_CHECK_FILE("/dev/urandom",
 			[
 				RANDOM_POOL="/dev/urandom";
 				AC_SUBST(RANDOM_POOL)
 				AC_DEFINE_UNQUOTED(RANDOM_POOL, "$RANDOM_POOL")
 			]
 		)
 	]
 )

 dnl Check for EGD pool file
 AC_ARG_WITH(egd-pool,
 	[  --with-egd-pool=FILE    read randomness from EGD pool FILE (default none)],
 	[
 		RANDOM_POOL="$withval";
 		AC_DEFINE(HAVE_EGD)
 		AC_SUBST(RANDOM_POOL)
 		AC_DEFINE_UNQUOTED(RANDOM_POOL, "$RANDOM_POOL")
 	]
 )

 dnl Make sure we have random number support
 if test -z "$RANDOM_POOL" -a -z "$EGD_POOL"; then
 	AC_MSG_ERROR([No random device found, and no EGD random pool specified])
 fi

 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)]
 )

 dnl 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 /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

 dnl Compile with dante SOCKS library
 AC_ARG_WITH(dante,
 	[  --with-dante=DIR        Use Dante SOCKS lib (default is system library path)],
 	[
 		SAVELIBS="$LIBS"
 		SOCKSLIBS=""
 		SOCKSLIBPATH=""
 		if test "x$withval" != "xno" ; then
 			if test -n $withval ; then
 				LIBS="$LIBS -L$withval"
 				SOCKSLIBPATH="-L$withval"
 			fi
 			AC_CHECK_LIB(socks, Rconnect, AC_DEFINE(HAVE_DANTE) SOCKSLIBS="$SOCKSLIBPATH -lsocks")
 		fi
 		LIBS="$SAVELIBS $SOCKSLIBS"
 	]
 )

 dnl Compile with SOCKS4 SOCKS library
 AC_ARG_WITH(socks4,
 	[  --with-socks4=DIR        Use Socks4 SOCKS lib (default is system library path)],
 	[
 		SAVELIBS="$LIBS"
 		SOCKSLIBS=""
 		SOCKSLIBPATH=""
 		if test "x$withval" != "xno" ; then
 			if test -n $withval ; then
 				LIBS="$LIBS -L$withval"
 				SOCKSLIBPATH="-L$withval"
 			fi
 			AC_CHECK_LIB(socks, Rconnect, AC_DEFINE(HAVE_SOCKS4) SOCKSLIBS="$SOCKSLIBPATH -lsocks")
 		fi
 		LIBS="$SAVELIBS $SOCKSLIBS"
 	]
 )

 dnl Compile with SOCKS5 SOCKS library
 AC_ARG_WITH(socks5,
 	[  --with-socks5=DIR        Use Socks5 SOCKS lib (default is system library path)],
 	[
 		SAVELIBS="$LIBS"
 		SOCKSLIBS=""
 		SOCKSLIBPATH=""
 		if test "x$withval" != "xno" ; then
 			if test -n $withval ; then
 				LIBS="$LIBS -L$withval"
 				SOCKSLIBPATH="-L$withval"
 			fi
 			AC_CHECK_LIB(socks5, SOCKSconnect, AC_DEFINE(HAVE_SOCKS5) SOCKSLIBS="$SOCKSLIBPATH -lsocks5")
 		fi
 		LIBS="$SAVELIBS $SOCKSLIBS"
 	]
 )
 AC_ARG_WITH(catman,
 	[  --with-catman=man|cat   Install preformatted manpages[no]],
 	[
 		MANTYPE='$(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)

 if test -z "$no_dev_ptmx" ; then
 	AC_CHECK_FILE("/dev/ptmx", AC_DEFINE_UNQUOTED(HAVE_DEV_PTMX))
 fi
 AC_CHECK_FILE("/dev/ptc", AC_DEFINE_UNQUOTED(HAVE_DEV_PTS_AND_PTC))

 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)
 	]
 )

 dnl 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"
 			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

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

 dnl 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
 	]
 )

 dnl 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
 	]
 )

 dnl Check whether user wants TCP wrappers support
 AC_ARG_WITH(tcp-wrappers,
 	[  --with-tcp-wrappers     Enable tcpwrappers support],
 	[
 		if test "x$withval" != "$xno" ; then
 			AC_DEFINE(LIBWRAP)
 			LIBS="$LIBS -lwrap"
 		fi
 	]
 )

 dnl 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
 	]
 )

 dnl 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
 	]
 )

 dnl 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
 	]
 )

 dnl 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
 	]
 )

 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
 	]
 )

 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
 	]
 )

 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)

 dnl 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

 AC_OUTPUT(Makefile)
	AC_INIT(ssh.c)

	AC_CONFIG_HEADER(config.h)
	AC_CANONICAL_HOST

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

	AC_ARG_WITH(rsh,
	[ --with-rsh=PATH Specify path to remote shell program ],
	[
	if test "x$withval" != "$xno" ; 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

	dnl Checks for compiler characteristics
	if test "$GCC" = "yes"; then CFLAGS="$CFLAGS -Wall"; fi

	AC_C_INLINE

	dnl Check for OpenSSL/SSLeay directories.
	AC_MSG_CHECKING([for OpenSSL/SSLeay directory])
	for ssldir in $prefix /usr /usr/local/openssl /usr/lib/openssl /usr/local/ssl /usr/lib/ssl /usr/local $prefix /usr/pkg ; do
	if test -f "$ssldir/include/openssl/crypto.h"; then
	AC_DEFINE(HAVE_OPENSSL)
	GOT_SSL="yes"
	break
	fi
	if test -f "$ssldir/include/ssl/crypto.h"; then
	AC_DEFINE(HAVE_SSL)
	GOT_SSL="yes"
	break
	fi
	done
	if test -z "$GOT_SSL" ; then
	AC_MSG_ERROR([Could not find SSLeay / OpenSSL libraries, please install])
	fi
	AC_SUBST(ssldir)
	AC_DEFINE_UNQUOTED(ssldir, "$ssldir")
	if test "$ssldir" != "/usr"; then
	CFLAGS="$CFLAGS -I$ssldir/include"
	LDFLAGS="$LDFLAGS -L$ssldir/lib"
	fi
	AC_MSG_RESULT($ssldir)

	dnl Check for some target-specific stuff
	case "$host" in
	--aix*)
	AFS_LIBS="-lld"
	AC_DEFINE(BROKEN_GETADDRINFO)
	;;
	--hpux10*)
	if test -z "$GCC"; then
	CFLAGS="$CFLAGS -Aa"
	fi
	CFLAGS="$CFLAGS -D_HPUX_SOURCE"
	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*)
	MANTYPE='$(CATMAN)'
	no_libsocket=1
	no_libnsl=1
	;;
	--irix6*)
	MANTYPE='$(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
	;;
	--netbsd*)
	if test "$GOT_SSL" = "yes"; then
	LDFLAGS="$LDFLAGS -R$ssldir/lib"
	fi
	;;
	--solaris*)
	AC_DEFINE(USE_UTMPX)
	;;
	--sysv*)
	LIBS="$LIBS -lgen -lsocket"
	;;
	esac

	dnl Check for RSAref library.
	AC_MSG_CHECKING([for RSAref library])
	saved_LIBS="$LIBS"
	LIBS="$saved_LIBS -lRSAglue -lrsaref"
	AC_TRY_LINK([], [],
	[AC_MSG_RESULT(yes);
	AC_DEFINE(RSAREF)],
	[AC_MSG_RESULT(no)]; LIBS="$saved_LIBS")

	dnl Checks for libraries.
	AC_CHECK_LIB(crypto, CRYPTO_lock, ,AC_MSG_ERROR([* libcrypto missing - please install first *]))
	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

	dnl 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)

	dnl Checks for library functions.
	AC_CHECK_FUNCS(arc4random bindresvport_af freeaddrinfo gai_strerror getaddrinfo getpagesize getnameinfo innetgr md5_crypt mkdtemp openpty rresvport_af setenv seteuid setlogin setproctitle setreuid snprintf strlcat strlcpy updwtmpx vsnprintf _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)])]
	)

	dnl 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)

	dnl More checks for data types
	AC_MSG_CHECKING([for intXX_t types])
	AC_TRY_COMPILE(
	[#include <sys/types.h>],
	[int16_t a; int32_t b; a = 1235; b = 1235;],
	[
	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_int16_t c; u_int32_t d; c = 1235; d = 1235;],
	[
	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>],
	[
	u_int16_t c; u_int32_t d;
	int16_t e; int32_t f;
	c = 1235; d = 1235;
	e = 1235; f = 1235;
	],
	[
	AC_DEFINE(HAVE_U_INTXX_T)
	AC_DEFINE(HAVE_INTXX_T)
	AC_MSG_RESULT(yes)
	],
	[AC_MSG_RESULT(no)]
	)
	fi

	AC_MSG_CHECKING([for uintXX_t types])
	AC_TRY_COMPILE(
	[#include <sys/types.h>],
	[uint16_t c; uint32_t d; c = 1235; d = 1235;],
	[
	AC_DEFINE(HAVE_UINTXX_T)
	AC_MSG_RESULT(yes)
	],
	[AC_MSG_RESULT(no)]
	)

	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)]
	)

	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"
	dnl Check PAM strerror arguments
	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

	AC_MSG_CHECKING([whether to build GNOME ssh-askpass])
	dnl Check whether user wants GNOME ssh-askpass
	AC_ARG_WITH(gnome-askpass,
	[ --with-gnome-askpass Build the GNOME passphrase requester (default=no)],
	[
	if test x$withval = xno ; then
	GNOME_ASKPASS="";
	else
	GNOME_ASKPASS="gnome-ssh-askpass";
	fi
	])
	AC_SUBST(GNOME_ASKPASS)

	if test -z "$GNOME_ASKPASS" ; then
	AC_MSG_RESULT(no)
	else
	AC_MSG_RESULT(yes)
	fi

	dnl Check for user-specified random device
	AC_ARG_WITH(random,
	[ --with-random=FILE read randomness from FILE (default=/dev/urandom)],
	[
	RANDOM_POOL="$withval";
	AC_DEFINE_UNQUOTED(RANDOM_POOL, "$RANDOM_POOL")
	],
	[
	dnl Check for random device
	AC_CHECK_FILE("/dev/urandom",
	[
	RANDOM_POOL="/dev/urandom";
	AC_SUBST(RANDOM_POOL)
	AC_DEFINE_UNQUOTED(RANDOM_POOL, "$RANDOM_POOL")
	]
	)
	]
	)

	dnl Check for EGD pool file
	AC_ARG_WITH(egd-pool,
	[ --with-egd-pool=FILE read randomness from EGD pool FILE (default none)],
	[
	RANDOM_POOL="$withval";
	AC_DEFINE(HAVE_EGD)
	AC_SUBST(RANDOM_POOL)
	AC_DEFINE_UNQUOTED(RANDOM_POOL, "$RANDOM_POOL")
	]
	)

	dnl Make sure we have random number support
	if test -z "$RANDOM_POOL" -a -z "$EGD_POOL"; then
	AC_MSG_ERROR([No random device found, and no EGD random pool specified])
	fi

	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)]
	)

	dnl 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 /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

	dnl Compile with dante SOCKS library
	AC_ARG_WITH(dante,
	[ --with-dante=DIR Use Dante SOCKS lib (default is system library path)],
	[
	SAVELIBS="$LIBS"
	SOCKSLIBS=""
	SOCKSLIBPATH=""
	if test "x$withval" != "xno" ; then
	if test -n $withval ; then
	LIBS="$LIBS -L$withval"
	SOCKSLIBPATH="-L$withval"
	fi
	AC_CHECK_LIB(socks, Rconnect, AC_DEFINE(HAVE_DANTE) SOCKSLIBS="$SOCKSLIBPATH -lsocks")
	fi
	LIBS="$SAVELIBS $SOCKSLIBS"
	]
	)

	dnl Compile with SOCKS4 SOCKS library
	AC_ARG_WITH(socks4,
	[ --with-socks4=DIR Use Socks4 SOCKS lib (default is system library path)],
	[
	SAVELIBS="$LIBS"
	SOCKSLIBS=""
	SOCKSLIBPATH=""
	if test "x$withval" != "xno" ; then
	if test -n $withval ; then
	LIBS="$LIBS -L$withval"
	SOCKSLIBPATH="-L$withval"
	fi
	AC_CHECK_LIB(socks, Rconnect, AC_DEFINE(HAVE_SOCKS4) SOCKSLIBS="$SOCKSLIBPATH -lsocks")
	fi
	LIBS="$SAVELIBS $SOCKSLIBS"
	]
	)

	dnl Compile with SOCKS5 SOCKS library
	AC_ARG_WITH(socks5,
	[ --with-socks5=DIR Use Socks5 SOCKS lib (default is system library path)],
	[
	SAVELIBS="$LIBS"
	SOCKSLIBS=""
	SOCKSLIBPATH=""
	if test "x$withval" != "xno" ; then
	if test -n $withval ; then
	LIBS="$LIBS -L$withval"
	SOCKSLIBPATH="-L$withval"
	fi
	AC_CHECK_LIB(socks5, SOCKSconnect, AC_DEFINE(HAVE_SOCKS5) SOCKSLIBS="$SOCKSLIBPATH -lsocks5")
	fi
	LIBS="$SAVELIBS $SOCKSLIBS"
	]
	)
	AC_ARG_WITH(catman,
	[ --with-catman=man\|cat Install preformatted manpages[no]],
	[
	MANTYPE='$(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)

	if test -z "$no_dev_ptmx" ; then
	AC_CHECK_FILE("/dev/ptmx", AC_DEFINE_UNQUOTED(HAVE_DEV_PTMX))
	fi
	AC_CHECK_FILE("/dev/ptc", AC_DEFINE_UNQUOTED(HAVE_DEV_PTS_AND_PTC))

	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)
	]
	)

	dnl 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"
	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

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

	dnl 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
	]
	)

	dnl 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
	]
	)

	dnl Check whether user wants TCP wrappers support
	AC_ARG_WITH(tcp-wrappers,
	[ --with-tcp-wrappers Enable tcpwrappers support],
	[
	if test "x$withval" != "$xno" ; then
	AC_DEFINE(LIBWRAP)
	LIBS="$LIBS -lwrap"
	fi
	]
	)

	dnl 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
	]
	)

	dnl 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
	]
	)

	dnl 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
	]
	)

	dnl 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
	]
	)

	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
	]
	)

	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
	]
	)

	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)

	dnl 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

	AC_OUTPUT(Makefile)