configure.ac - htop - Rivoreo Source Code Repositories

 #                                               -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.

 AC_PREREQ(2.65)
 AC_INIT([htop],[2.3.0],[msl0000023508@gmail.com])

 AC_CONFIG_SRCDIR([htop.c])
 AC_CONFIG_AUX_DIR([.])
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_MACRO_DIR([m4])

 # Required by hwloc scripts
 AC_CANONICAL_TARGET

 AM_INIT_AUTOMAKE([1.11])

 # Checks for programs.
 # ----------------------------------------------------------------------
 AC_PROG_CC
 AM_PROG_CC_C_O

 # Required by hwloc scripts
 AC_USE_SYSTEM_EXTENSIONS

 # Checks for platform.
 # ----------------------------------------------------------------------
 case "$target_os" in
 linux*)
    my_htop_platform=linux
    ;;
 freebsd*|kfreebsd*)
    my_htop_platform=freebsd
    ;;
 openbsd*)
    my_htop_platform=openbsd
    ;;
 dragonfly*)
    my_htop_platform=dragonflybsd
    ;;
 darwin*)
    my_htop_platform=darwin
    ;;
 solaris*)
    my_htop_platform=solaris
    ;;
 *)
    my_htop_platform=unsupported
    ;;
 esac

 # Checks for libraries.
 # ----------------------------------------------------------------------
 AC_CHECK_LIB([m], [ceil], [], [missing_libraries="$missing_libraries libm"])

 # Checks for header files.
 # ----------------------------------------------------------------------
 AC_HEADER_DIRENT
 AC_HEADER_STDC
 AC_CHECK_HEADERS([stdlib.h string.h strings.h sys/param.h sys/time.h unistd.h],[:],[
   missing_headers="$missing_headers $ac_header"
 ])
 AC_CHECK_HEADERS([execinfo.h],[:],[:])

 AC_HEADER_MAJOR
 dnl glibc 2.25 deprecates 'major' and 'minor' in <sys/types.h> and requires to
 dnl include <sys/sysmacros.h>. However the logic in AC_HEADER_MAJOR has not yet
 dnl been updated in Autoconf 2.69, so use a workaround:
 m4_version_prereq([2.70], [],
 [if test "x$ac_cv_header_sys_mkdev_h" = xno; then
    AC_CHECK_HEADER(sys/sysmacros.h, [AC_DEFINE(MAJOR_IN_SYSMACROS, 1,
       [Define to 1 if `major', `minor', and `makedev' are declared in <sys/sysmacros.h>.])])
 fi])

 # Checks for typedefs, structures, and compiler characteristics.
 # ----------------------------------------------------------------------
 AC_HEADER_STDBOOL
 AC_C_CONST
 AC_TYPE_PID_T
 AC_TYPE_UID_T

 # Checks for library functions and compiler features.
 # ----------------------------------------------------------------------
 AC_FUNC_CLOSEDIR_VOID
 AC_TYPE_SIGNAL
 AC_FUNC_STAT
 AC_CHECK_FUNCS([memmove strncasecmp strstr strdup])

 save_cflags="${CFLAGS}"
 CFLAGS="${CFLAGS} -std=c99"
 AC_MSG_CHECKING([whether gcc -std=c99 option works])
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
    [AC_INCLUDES_DEFAULT], [[char *a; a = strdup("foo"); int i = 0; i++; // C99]])],
    [AC_MSG_RESULT([yes])],
    [AC_MSG_ERROR([htop is written in C99. A newer version of gcc is required.])])
 CFLAGS="$save_cflags"

 save_cflags="${CFLAGS}"
 CFLAGS="$CFLAGS -Wextra"
 AC_MSG_CHECKING([if compiler supports -Wextra])
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])],[
    wextra_flag=-Wextra
    AC_MSG_RESULT([yes])
 ],[
    wextra_flag=
    AC_MSG_RESULT([no])
 ])
 CFLAGS="$save_cflags"
 AC_SUBST(wextra_flag)

 # Checks for features and flags.
 # ----------------------------------------------------------------------
 PROCDIR=/proc

 AC_ARG_ENABLE(proc, [AS_HELP_STRING([--enable-proc], [use Linux-compatible proc filesystem])], enable_proc="yes", enable_proc="no")
 if test "x$enable_proc" = xyes; then
    # An enabled proc assumes we're emulating Linux.
    my_htop_platform=linux
    AC_DEFINE(HAVE_PROC, 1, [Define if using a Linux-compatible proc filesystem.])
 fi

 AC_ARG_WITH(proc, [AS_HELP_STRING([--with-proc=DIR], [Location of a Linux-compatible proc filesystem (default=/proc).])],

 if test -n "$withval"; then
    AC_DEFINE_UNQUOTED(PROCDIR, "$withval", [Path of proc filesystem])
    PROCDIR="$withval"
 fi,
 AC_DEFINE(PROCDIR, "/proc", [Path of proc filesystem]))

 if test "x$cross_compiling" = xno; then
    if test "x$enable_proc" = xyes; then
       AC_CHECK_FILE($PROCDIR/stat,,AC_MSG_ERROR(Cannot find $PROCDIR/stat. Make sure you have a Linux-compatible /proc filesystem mounted. See the file README for help.))
       AC_CHECK_FILE($PROCDIR/meminfo,,AC_MSG_ERROR(Cannot find $PROCDIR/meminfo. Make sure you have a Linux-compatible /proc filesystem mounted. See the file README for help.))
    fi
 fi

 AC_ARG_ENABLE(openvz, [AS_HELP_STRING([--enable-openvz], [enable OpenVZ support])], ,enable_openvz="no")
 if test "x$enable_openvz" = xyes; then
    AC_DEFINE(HAVE_OPENVZ, 1, [Define if openvz support enabled.])
 fi

 AC_ARG_ENABLE(cgroup, [AS_HELP_STRING([--enable-cgroup], [enable cgroups support])], ,enable_cgroup="no")
 if test "x$enable_cgroup" = xyes; then
    AC_DEFINE(HAVE_CGROUP, 1, [Define if cgroup support enabled.])
 fi

 AC_ARG_ENABLE(vserver, [AS_HELP_STRING([--enable-vserver], [enable VServer support])], ,enable_vserver="no")
 if test "x$enable_vserver" = xyes; then
     AC_DEFINE(HAVE_VSERVER, 1, [Define if vserver support enabled.])
 fi

 AC_ARG_ENABLE(ancient_vserver, [AS_HELP_STRING([--enable-ancient-vserver], [enable ancient VServer support (implies --enable-vserver)])], ,enable_ancient_vserver="no")
 if test "x$enable_ancient_vserver" = xyes; then
     AC_DEFINE(HAVE_VSERVER, 1, [Define if vserver support enabled.])
     AC_DEFINE(HAVE_ANCIENT_VSERVER, 1, [Define if ancient vserver support enabled.])
 fi

 AC_ARG_ENABLE(taskstats, [AS_HELP_STRING([--enable-taskstats], [enable per-task IO Stats (taskstats kernel sup required)])], ,enable_taskstats="yes")
 if test "x$enable_taskstats" = xyes; then
     AC_DEFINE(HAVE_TASKSTATS, 1, [Define if taskstats support enabled.])
 fi

 # HTOP_CHECK_SCRIPT(LIBNAME, FUNCTION, DEFINE, CONFIG_SCRIPT, ELSE_PART)
 m4_define([HTOP_CHECK_SCRIPT],
 [
    if test ! -z "m4_toupper($HTOP_[$1]_CONFIG_SCRIPT)"; then
       # to be used to set the path to ncurses*-config when cross-compiling
       htop_config_script_libs=$(m4_toupper($HTOP_[$1]_CONFIG_SCRIPT) --libs 2> /dev/null)
       htop_config_script_cflags=$(m4_toupper($HTOP_[$1]_CONFIG_SCRIPT) --cflags 2> /dev/null)
    else
       htop_config_script_libs=$([$4] --libs 2> /dev/null)
       htop_config_script_cflags=$([$4] --cflags 2> /dev/null)
    fi
    htop_script_success=no
    htop_save_LDFLAGS="$LDFLAGS"
    htop_save_CFLAGS="$CFLAGS"
    if test ! "x$htop_config_script_libs" = x; then
       LDFLAGS="$htop_config_script_libs $LDFLAGS"
       CFLAGS="$htop_config_script_cflags $CFLAGS"
       AC_CHECK_LIB([$1], [$2], [
          AC_DEFINE([$3], 1, [The library is present.])
          LIBS="$htop_config_script_libs $LIBS "
          htop_script_success=yes
       ], [
         CFLAGS="$htop_save_CFLAGS"
       ])
       LDFLAGS="$htop_save_LDFLAGS"
    fi
    if test "x$htop_script_success" = xno; then
       [$5]
    fi
 ])

 # HTOP_CHECK_LIB(LIBNAME, FUNCTION, DEFINE, ELSE_PART)
 m4_define([HTOP_CHECK_LIB],
 [
    AC_CHECK_LIB([$1], [$2], [
       AC_DEFINE([$3], 1, [The library is present.])
       LIBS="-l[$1] $LIBS "
    ], [$4])
 ])

 AC_ARG_ENABLE(unicode, [AS_HELP_STRING([--enable-unicode], [enable Unicode support])], ,enable_unicode="yes")
 if test "x$enable_unicode" = xyes; then
    HTOP_CHECK_SCRIPT([ncursesw6], [addnwstr], [HAVE_LIBNCURSESW], "ncursesw6-config",
     HTOP_CHECK_SCRIPT([ncursesw], [addnwstr], [HAVE_LIBNCURSESW], "ncursesw6-config",
      HTOP_CHECK_SCRIPT([ncursesw], [addnwstr], [HAVE_LIBNCURSESW], "ncursesw5-config",
       HTOP_CHECK_SCRIPT([ncurses], [addnwstr], [HAVE_LIBNCURSESW], "ncurses5-config",
        HTOP_CHECK_LIB([ncursesw6], [addnwstr], [HAVE_LIBNCURSESW],
         HTOP_CHECK_LIB([ncursesw], [addnwstr], [HAVE_LIBNCURSESW],
          HTOP_CHECK_LIB([ncurses], [addnwstr], [HAVE_LIBNCURSESW],
        missing_libraries="$missing_libraries libncursesw"
        AC_MSG_ERROR([You may want to use --disable-unicode or install libncursesw.])
    )))))))

    AC_CHECK_HEADERS([ncursesw/curses.h],[:],
       [AC_CHECK_HEADERS([ncurses/ncurses.h],[:],
          [AC_CHECK_HEADERS([ncurses/curses.h],[:],
             [AC_CHECK_HEADERS([ncurses.h],[:],[missing_headers="$missing_headers $ac_header"])])])])
 else
    HTOP_CHECK_SCRIPT([ncurses6], [refresh], [HAVE_LIBNCURSES], "ncurses6-config",
     HTOP_CHECK_SCRIPT([ncurses], [refresh], [HAVE_LIBNCURSES], "ncurses5-config",
      HTOP_CHECK_LIB([ncurses6],  [refresh], [HAVE_LIBNCURSES],
       HTOP_CHECK_LIB([ncurses],  [refresh], [HAVE_LIBNCURSES],
       missing_libraries="$missing_libraries libncurses"
    ))))

    AC_CHECK_HEADERS([curses.h],[:],
       [AC_CHECK_HEADERS([ncurses/curses.h],[:],
          [AC_CHECK_HEADERS([ncurses/ncurses.h],[:],
             [AC_CHECK_HEADERS([ncurses.h],[:],[missing_headers="$missing_headers $ac_header"])])])])
 fi

 if test "$my_htop_platform" = "freebsd"; then
    AC_CHECK_LIB([kvm], [kvm_open], [], [missing_libraries="$missing_libraries libkvm"])
 fi

 if test "$my_htop_platform" = "openbsd"; then
    AC_CHECK_LIB([kvm], [kvm_open], [], [missing_libraries="$missing_libraries libkvm"])
 fi

 if test "$my_htop_platform" = "solaris"; then
    AC_CHECK_LIB([kstat], [kstat_open], [], [missing_libraries="$missing_libraries libkstat"])
    AC_CHECK_LIB([proc], [Pgrab_error], [], [missing_libraries="$missing_libraries libproc"])
    AC_CHECK_LIB([malloc], [free], [], [missing_libraries="$missing_libraries libmalloc"])
 fi

 AC_ARG_ENABLE(linux_affinity, [AS_HELP_STRING([--enable-linux-affinity], [enable Linux sched_setaffinity and sched_getaffinity for affinity support, disables hwloc])], ,enable_linux_affinity="yes")
 if test "x$enable_linux_affinity" = xyes -a "x$cross_compiling" = xno; then
    AC_MSG_CHECKING([for usable sched_setaffinity])
    AC_RUN_IFELSE([
      AC_LANG_PROGRAM([[
        #include <sched.h>
        #include <errno.h>
        static cpu_set_t cpuset;
        ]], [[
        CPU_ZERO(&cpuset);
        sched_setaffinity(0, sizeof(cpu_set_t), &cpuset);
        if (errno == ENOSYS) return 1;
        ]])],
      [AC_MSG_RESULT([yes])],
      [enable_linux_affinity=no
       AC_MSG_RESULT([no])])
 fi
 if test "x$enable_linux_affinity" = xyes; then
    AC_DEFINE(HAVE_LINUX_AFFINITY, 1, [Define if Linux sched_setaffinity and sched_getaffinity are to be used.])
 fi

 AC_ARG_ENABLE(hwloc, [AS_HELP_STRING([--enable-hwloc], [enable hwloc support for CPU affinity])],, enable_hwloc="no")
 if test "x$enable_hwloc" = xyes
 then
    AC_CHECK_LIB([hwloc], [hwloc_get_proc_cpubind], [], [missing_libraries="$missing_libraries libhwloc"])
    AC_CHECK_HEADERS([hwloc.h],[:], [missing_headers="$missing_headers $ac_header"])
 fi

 AC_ARG_ENABLE(setuid, [AS_HELP_STRING([--enable-setuid], [enable setuid support for platforms that need it])],, enable_setuid="no")
 if test "x$enable_setuid" = xyes
 then
    AC_DEFINE(HAVE_SETUID_ENABLED, 1, [Define if setuid support should be enabled.])
 fi

 AC_ARG_ENABLE(delayacct, [AS_HELP_STRING([--enable-delayacct], [enable Linux delay accounting])],, enable_delayacct="no")
 if test "x$enable_delayacct" = xyes
 then
    m4_ifdef([PKG_PROG_PKG_CONFIG], [
       PKG_PROG_PKG_CONFIG()
       PKG_CHECK_MODULES(LIBNL3, libnl-3.0, [], [missing_libraries="$missing_libraries libnl-3"])
       PKG_CHECK_MODULES(LIBNL3GENL, libnl-genl-3.0, [], [missing_libraries="$missing_libraries libnl-genl-3"])
       CFLAGS="$CFLAGS $LIBNL3_CFLAGS $LIBNL3GENL_CFLAGS"
       LIBS="$LIBS $LIBNL3_LIBS $LIBNL3GENL_LIBS"
       AC_DEFINE(HAVE_DELAYACCT, 1, [Define if delay accounting support should be enabled.])
    ], [
       pkg_m4_absent=1
       m4_warning([configure is generated without pkg.m4. 'make dist' target will be disabled.])
       AC_MSG_ERROR([htop on Linux requires pkg-config for checking delayacct requirements. Please install pkg-config and run ./autogen.sh to rebuild the configure script.])
    ])
 fi

 AC_ARG_ENABLE(truss-strsize, [AS_HELP_STRING([--enable-truss-strsize], [use option '-s' for string size when running truss(1)])], , test "x$my_htop_platform" = xfreebsd && enable_truss_strsize=yes || enable_truss_strsize=no)
 if test "x$enable_truss_strsize" = xyes; then
 	AC_DEFINE(TRUSS_SUPPORT_STRING_SIZE, 1, [Define if truss(1) support option '-s' for string size])
 fi


 # Bail out on errors.
 # ----------------------------------------------------------------------
 if test ! -z "$missing_libraries"; then
   AC_MSG_ERROR([missing libraries: $missing_libraries])
 fi
 if test ! -z "$missing_headers"; then
   AC_MSG_ERROR([missing headers: $missing_headers])
 fi

 AC_DEFINE_UNQUOTED(COPYRIGHT, "(C) 2004-2019 Hisham Muhammad", [Copyright message.])

 # We're done, let's go!
 # ----------------------------------------------------------------------
 AM_CONDITIONAL([HTOP_LINUX], [test "$my_htop_platform" = linux])
 AM_CONDITIONAL([HTOP_FREEBSD], [test "$my_htop_platform" = freebsd])
 AM_CONDITIONAL([HTOP_DRAGONFLYBSD], [test "$my_htop_platform" = dragonflybsd])
 AM_CONDITIONAL([HTOP_OPENBSD], [test "$my_htop_platform" = openbsd])
 AM_CONDITIONAL([HTOP_DARWIN], [test "$my_htop_platform" = darwin])
 AM_CONDITIONAL([HTOP_SOLARIS], [test "$my_htop_platform" = solaris])
 AM_CONDITIONAL([HTOP_UNSUPPORTED], [test "$my_htop_platform" = unsupported])
 AC_SUBST(my_htop_platform)
 AC_CONFIG_FILES([Makefile htop.1])
 AC_OUTPUT

 if test "$my_htop_platform" = "unsupported"
 then
    echo ""
    echo "****************************************************************"
    echo "WARNING! This platform is not currently supported by htop."
    echo ""
    echo "The code will build, but it will produce a dummy version of htop"
    echo "which shows no processes, using the files from the unsupported/"
    echo "directory. This is meant to be a skeleton, to be used as a"
    echo "starting point if you are porting htop to a new platform."
    echo "****************************************************************"
    echo ""
 fi
	# -- Autoconf --
	# Process this file with autoconf to produce a configure script.

	AC_PREREQ(2.65)
	AC_INIT([htop],[2.3.0],[msl0000023508@gmail.com])

	AC_CONFIG_SRCDIR([htop.c])
	AC_CONFIG_AUX_DIR([.])
	AC_CONFIG_HEADERS([config.h])
	AC_CONFIG_MACRO_DIR([m4])

	# Required by hwloc scripts
	AC_CANONICAL_TARGET

	AM_INIT_AUTOMAKE([1.11])

	# Checks for programs.
	# ----------------------------------------------------------------------
	AC_PROG_CC
	AM_PROG_CC_C_O

	# Required by hwloc scripts
	AC_USE_SYSTEM_EXTENSIONS

	# Checks for platform.
	# ----------------------------------------------------------------------
	case "$target_os" in
	linux*)
	my_htop_platform=linux
	;;
	freebsd\|kfreebsd)
	my_htop_platform=freebsd
	;;
	openbsd*)
	my_htop_platform=openbsd
	;;
	dragonfly*)
	my_htop_platform=dragonflybsd
	;;
	darwin*)
	my_htop_platform=darwin
	;;
	solaris*)
	my_htop_platform=solaris
	;;
	*)
	my_htop_platform=unsupported
	;;
	esac

	# Checks for libraries.
	# ----------------------------------------------------------------------
	AC_CHECK_LIB([m], [ceil], [], [missing_libraries="$missing_libraries libm"])

	# Checks for header files.
	# ----------------------------------------------------------------------
	AC_HEADER_DIRENT
	AC_HEADER_STDC
	AC_CHECK_HEADERS([stdlib.h string.h strings.h sys/param.h sys/time.h unistd.h],[:],[
	missing_headers="$missing_headers $ac_header"
	])
	AC_CHECK_HEADERS([execinfo.h],[:],[:])

	AC_HEADER_MAJOR
	dnl glibc 2.25 deprecates 'major' and 'minor' in <sys/types.h> and requires to
	dnl include <sys/sysmacros.h>. However the logic in AC_HEADER_MAJOR has not yet
	dnl been updated in Autoconf 2.69, so use a workaround:
	m4_version_prereq([2.70], [],
	[if test "x$ac_cv_header_sys_mkdev_h" = xno; then
	AC_CHECK_HEADER(sys/sysmacros.h, [AC_DEFINE(MAJOR_IN_SYSMACROS, 1,
	[Define to 1 if `major', `minor', and `makedev' are declared in <sys/sysmacros.h>.])])
	fi])

	# Checks for typedefs, structures, and compiler characteristics.
	# ----------------------------------------------------------------------
	AC_HEADER_STDBOOL
	AC_C_CONST
	AC_TYPE_PID_T
	AC_TYPE_UID_T

	# Checks for library functions and compiler features.
	# ----------------------------------------------------------------------
	AC_FUNC_CLOSEDIR_VOID
	AC_TYPE_SIGNAL
	AC_FUNC_STAT
	AC_CHECK_FUNCS([memmove strncasecmp strstr strdup])

	save_cflags="${CFLAGS}"
	CFLAGS="${CFLAGS} -std=c99"
	AC_MSG_CHECKING([whether gcc -std=c99 option works])
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
	[AC_INCLUDES_DEFAULT], [[char *a; a = strdup("foo"); int i = 0; i++; // C99]])],
	[AC_MSG_RESULT([yes])],
	[AC_MSG_ERROR([htop is written in C99. A newer version of gcc is required.])])
	CFLAGS="$save_cflags"

	save_cflags="${CFLAGS}"
	CFLAGS="$CFLAGS -Wextra"
	AC_MSG_CHECKING([if compiler supports -Wextra])
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])],[
	wextra_flag=-Wextra
	AC_MSG_RESULT([yes])
	],[
	wextra_flag=
	AC_MSG_RESULT([no])
	])
	CFLAGS="$save_cflags"
	AC_SUBST(wextra_flag)

	# Checks for features and flags.
	# ----------------------------------------------------------------------
	PROCDIR=/proc

	AC_ARG_ENABLE(proc, [AS_HELP_STRING([--enable-proc], [use Linux-compatible proc filesystem])], enable_proc="yes", enable_proc="no")
	if test "x$enable_proc" = xyes; then
	# An enabled proc assumes we're emulating Linux.
	my_htop_platform=linux
	AC_DEFINE(HAVE_PROC, 1, [Define if using a Linux-compatible proc filesystem.])
	fi

	AC_ARG_WITH(proc, [AS_HELP_STRING([--with-proc=DIR], [Location of a Linux-compatible proc filesystem (default=/proc).])],

	if test -n "$withval"; then
	AC_DEFINE_UNQUOTED(PROCDIR, "$withval", [Path of proc filesystem])
	PROCDIR="$withval"
	fi,
	AC_DEFINE(PROCDIR, "/proc", [Path of proc filesystem]))

	if test "x$cross_compiling" = xno; then
	if test "x$enable_proc" = xyes; then
	AC_CHECK_FILE($PROCDIR/stat,,AC_MSG_ERROR(Cannot find $PROCDIR/stat. Make sure you have a Linux-compatible /proc filesystem mounted. See the file README for help.))
	AC_CHECK_FILE($PROCDIR/meminfo,,AC_MSG_ERROR(Cannot find $PROCDIR/meminfo. Make sure you have a Linux-compatible /proc filesystem mounted. See the file README for help.))
	fi
	fi

	AC_ARG_ENABLE(openvz, [AS_HELP_STRING([--enable-openvz], [enable OpenVZ support])], ,enable_openvz="no")
	if test "x$enable_openvz" = xyes; then
	AC_DEFINE(HAVE_OPENVZ, 1, [Define if openvz support enabled.])
	fi

	AC_ARG_ENABLE(cgroup, [AS_HELP_STRING([--enable-cgroup], [enable cgroups support])], ,enable_cgroup="no")
	if test "x$enable_cgroup" = xyes; then
	AC_DEFINE(HAVE_CGROUP, 1, [Define if cgroup support enabled.])
	fi

	AC_ARG_ENABLE(vserver, [AS_HELP_STRING([--enable-vserver], [enable VServer support])], ,enable_vserver="no")
	if test "x$enable_vserver" = xyes; then
	AC_DEFINE(HAVE_VSERVER, 1, [Define if vserver support enabled.])
	fi

	AC_ARG_ENABLE(ancient_vserver, [AS_HELP_STRING([--enable-ancient-vserver], [enable ancient VServer support (implies --enable-vserver)])], ,enable_ancient_vserver="no")
	if test "x$enable_ancient_vserver" = xyes; then
	AC_DEFINE(HAVE_VSERVER, 1, [Define if vserver support enabled.])
	AC_DEFINE(HAVE_ANCIENT_VSERVER, 1, [Define if ancient vserver support enabled.])
	fi

	AC_ARG_ENABLE(taskstats, [AS_HELP_STRING([--enable-taskstats], [enable per-task IO Stats (taskstats kernel sup required)])], ,enable_taskstats="yes")
	if test "x$enable_taskstats" = xyes; then
	AC_DEFINE(HAVE_TASKSTATS, 1, [Define if taskstats support enabled.])
	fi

	# HTOP_CHECK_SCRIPT(LIBNAME, FUNCTION, DEFINE, CONFIG_SCRIPT, ELSE_PART)
	m4_define([HTOP_CHECK_SCRIPT],
	[
	if test ! -z "m4_toupper($HTOP_[$1]_CONFIG_SCRIPT)"; then
	# to be used to set the path to ncurses*-config when cross-compiling
	htop_config_script_libs=$(m4_toupper($HTOP_[$1]_CONFIG_SCRIPT) --libs 2> /dev/null)
	htop_config_script_cflags=$(m4_toupper($HTOP_[$1]_CONFIG_SCRIPT) --cflags 2> /dev/null)
	else
	htop_config_script_libs=$([$4] --libs 2> /dev/null)
	htop_config_script_cflags=$([$4] --cflags 2> /dev/null)
	fi
	htop_script_success=no
	htop_save_LDFLAGS="$LDFLAGS"
	htop_save_CFLAGS="$CFLAGS"
	if test ! "x$htop_config_script_libs" = x; then
	LDFLAGS="$htop_config_script_libs $LDFLAGS"
	CFLAGS="$htop_config_script_cflags $CFLAGS"
	AC_CHECK_LIB([$1], [$2], [
	AC_DEFINE([$3], 1, [The library is present.])
	LIBS="$htop_config_script_libs $LIBS "
	htop_script_success=yes
	], [
	CFLAGS="$htop_save_CFLAGS"
	])
	LDFLAGS="$htop_save_LDFLAGS"
	fi
	if test "x$htop_script_success" = xno; then
	[$5]
	fi
	])

	# HTOP_CHECK_LIB(LIBNAME, FUNCTION, DEFINE, ELSE_PART)
	m4_define([HTOP_CHECK_LIB],
	[
	AC_CHECK_LIB([$1], [$2], [
	AC_DEFINE([$3], 1, [The library is present.])
	LIBS="-l[$1] $LIBS "
	], [$4])
	])

	AC_ARG_ENABLE(unicode, [AS_HELP_STRING([--enable-unicode], [enable Unicode support])], ,enable_unicode="yes")
	if test "x$enable_unicode" = xyes; then
	HTOP_CHECK_SCRIPT([ncursesw6], [addnwstr], [HAVE_LIBNCURSESW], "ncursesw6-config",
	HTOP_CHECK_SCRIPT([ncursesw], [addnwstr], [HAVE_LIBNCURSESW], "ncursesw6-config",
	HTOP_CHECK_SCRIPT([ncursesw], [addnwstr], [HAVE_LIBNCURSESW], "ncursesw5-config",
	HTOP_CHECK_SCRIPT([ncurses], [addnwstr], [HAVE_LIBNCURSESW], "ncurses5-config",
	HTOP_CHECK_LIB([ncursesw6], [addnwstr], [HAVE_LIBNCURSESW],
	HTOP_CHECK_LIB([ncursesw], [addnwstr], [HAVE_LIBNCURSESW],
	HTOP_CHECK_LIB([ncurses], [addnwstr], [HAVE_LIBNCURSESW],
	missing_libraries="$missing_libraries libncursesw"
	AC_MSG_ERROR([You may want to use --disable-unicode or install libncursesw.])
	)))))))

	AC_CHECK_HEADERS([ncursesw/curses.h],[:],
	[AC_CHECK_HEADERS([ncurses/ncurses.h],[:],
	[AC_CHECK_HEADERS([ncurses/curses.h],[:],
	[AC_CHECK_HEADERS([ncurses.h],[:],[missing_headers="$missing_headers $ac_header"])])])])
	else
	HTOP_CHECK_SCRIPT([ncurses6], [refresh], [HAVE_LIBNCURSES], "ncurses6-config",
	HTOP_CHECK_SCRIPT([ncurses], [refresh], [HAVE_LIBNCURSES], "ncurses5-config",
	HTOP_CHECK_LIB([ncurses6], [refresh], [HAVE_LIBNCURSES],
	HTOP_CHECK_LIB([ncurses], [refresh], [HAVE_LIBNCURSES],
	missing_libraries="$missing_libraries libncurses"
	))))

	AC_CHECK_HEADERS([curses.h],[:],
	[AC_CHECK_HEADERS([ncurses/curses.h],[:],
	[AC_CHECK_HEADERS([ncurses/ncurses.h],[:],
	[AC_CHECK_HEADERS([ncurses.h],[:],[missing_headers="$missing_headers $ac_header"])])])])
	fi

	if test "$my_htop_platform" = "freebsd"; then
	AC_CHECK_LIB([kvm], [kvm_open], [], [missing_libraries="$missing_libraries libkvm"])
	fi

	if test "$my_htop_platform" = "openbsd"; then
	AC_CHECK_LIB([kvm], [kvm_open], [], [missing_libraries="$missing_libraries libkvm"])
	fi

	if test "$my_htop_platform" = "solaris"; then
	AC_CHECK_LIB([kstat], [kstat_open], [], [missing_libraries="$missing_libraries libkstat"])
	AC_CHECK_LIB([proc], [Pgrab_error], [], [missing_libraries="$missing_libraries libproc"])
	AC_CHECK_LIB([malloc], [free], [], [missing_libraries="$missing_libraries libmalloc"])
	fi

	AC_ARG_ENABLE(linux_affinity, [AS_HELP_STRING([--enable-linux-affinity], [enable Linux sched_setaffinity and sched_getaffinity for affinity support, disables hwloc])], ,enable_linux_affinity="yes")
	if test "x$enable_linux_affinity" = xyes -a "x$cross_compiling" = xno; then
	AC_MSG_CHECKING([for usable sched_setaffinity])
	AC_RUN_IFELSE([
	AC_LANG_PROGRAM([[
	#include <sched.h>
	#include <errno.h>
	static cpu_set_t cpuset;
	]], [[
	CPU_ZERO(&cpuset);
	sched_setaffinity(0, sizeof(cpu_set_t), &cpuset);
	if (errno == ENOSYS) return 1;
	]])],
	[AC_MSG_RESULT([yes])],
	[enable_linux_affinity=no
	AC_MSG_RESULT([no])])
	fi
	if test "x$enable_linux_affinity" = xyes; then
	AC_DEFINE(HAVE_LINUX_AFFINITY, 1, [Define if Linux sched_setaffinity and sched_getaffinity are to be used.])
	fi

	AC_ARG_ENABLE(hwloc, [AS_HELP_STRING([--enable-hwloc], [enable hwloc support for CPU affinity])],, enable_hwloc="no")
	if test "x$enable_hwloc" = xyes
	then
	AC_CHECK_LIB([hwloc], [hwloc_get_proc_cpubind], [], [missing_libraries="$missing_libraries libhwloc"])
	AC_CHECK_HEADERS([hwloc.h],[:], [missing_headers="$missing_headers $ac_header"])
	fi

	AC_ARG_ENABLE(setuid, [AS_HELP_STRING([--enable-setuid], [enable setuid support for platforms that need it])],, enable_setuid="no")
	if test "x$enable_setuid" = xyes
	then
	AC_DEFINE(HAVE_SETUID_ENABLED, 1, [Define if setuid support should be enabled.])
	fi

	AC_ARG_ENABLE(delayacct, [AS_HELP_STRING([--enable-delayacct], [enable Linux delay accounting])],, enable_delayacct="no")
	if test "x$enable_delayacct" = xyes
	then
	m4_ifdef([PKG_PROG_PKG_CONFIG], [
	PKG_PROG_PKG_CONFIG()
	PKG_CHECK_MODULES(LIBNL3, libnl-3.0, [], [missing_libraries="$missing_libraries libnl-3"])
	PKG_CHECK_MODULES(LIBNL3GENL, libnl-genl-3.0, [], [missing_libraries="$missing_libraries libnl-genl-3"])
	CFLAGS="$CFLAGS $LIBNL3_CFLAGS $LIBNL3GENL_CFLAGS"
	LIBS="$LIBS $LIBNL3_LIBS $LIBNL3GENL_LIBS"
	AC_DEFINE(HAVE_DELAYACCT, 1, [Define if delay accounting support should be enabled.])
	], [
	pkg_m4_absent=1
	m4_warning([configure is generated without pkg.m4. 'make dist' target will be disabled.])
	AC_MSG_ERROR([htop on Linux requires pkg-config for checking delayacct requirements. Please install pkg-config and run ./autogen.sh to rebuild the configure script.])
	])
	fi

	AC_ARG_ENABLE(truss-strsize, [AS_HELP_STRING([--enable-truss-strsize], [use option '-s' for string size when running truss(1)])], , test "x$my_htop_platform" = xfreebsd && enable_truss_strsize=yes \|\| enable_truss_strsize=no)
	if test "x$enable_truss_strsize" = xyes; then
	AC_DEFINE(TRUSS_SUPPORT_STRING_SIZE, 1, [Define if truss(1) support option '-s' for string size])
	fi


	# Bail out on errors.
	# ----------------------------------------------------------------------
	if test ! -z "$missing_libraries"; then
	AC_MSG_ERROR([missing libraries: $missing_libraries])
	fi
	if test ! -z "$missing_headers"; then
	AC_MSG_ERROR([missing headers: $missing_headers])
	fi

	AC_DEFINE_UNQUOTED(COPYRIGHT, "(C) 2004-2019 Hisham Muhammad", [Copyright message.])

	# We're done, let's go!
	# ----------------------------------------------------------------------
	AM_CONDITIONAL([HTOP_LINUX], [test "$my_htop_platform" = linux])
	AM_CONDITIONAL([HTOP_FREEBSD], [test "$my_htop_platform" = freebsd])
	AM_CONDITIONAL([HTOP_DRAGONFLYBSD], [test "$my_htop_platform" = dragonflybsd])
	AM_CONDITIONAL([HTOP_OPENBSD], [test "$my_htop_platform" = openbsd])
	AM_CONDITIONAL([HTOP_DARWIN], [test "$my_htop_platform" = darwin])
	AM_CONDITIONAL([HTOP_SOLARIS], [test "$my_htop_platform" = solaris])
	AM_CONDITIONAL([HTOP_UNSUPPORTED], [test "$my_htop_platform" = unsupported])
	AC_SUBST(my_htop_platform)
	AC_CONFIG_FILES([Makefile htop.1])
	AC_OUTPUT

	if test "$my_htop_platform" = "unsupported"
	then
	echo ""
	echo "****************************************************************"
	echo "WARNING! This platform is not currently supported by htop."
	echo ""
	echo "The code will build, but it will produce a dummy version of htop"
	echo "which shows no processes, using the files from the unsupported/"
	echo "directory. This is meant to be a skeleton, to be used as a"
	echo "starting point if you are porting htop to a new platform."
	echo "****************************************************************"
	echo ""
	fi