configure.ac

dnl Autoconf settings for vlc

AC_COPYRIGHT([Copyright 2002-2011 the VideoLAN team])

AC_INIT(vlc, 1.2.0-git)
VERSION_MAJOR="1"
VERSION_MINOR="2"
VERSION_REVISION="0"
VERSION_EXTRA="-git"
PKGDIR="vlc"
AC_SUBST(PKGDIR)

CONFIGURE_LINE="`echo "$0 $ac_configure_args" | sed -e 's/\\\/\\\\\\\/g'`"
CODENAME="Twoflower"
COPYRIGHT_YEARS="1996-2011"

AC_CONFIG_SRCDIR(src/libvlc.c)
AC_CONFIG_AUX_DIR(autotools)
AC_CONFIG_MACRO_DIR(m4)
AC_CONFIG_LIBOBJ_DIR(compat)
AC_CANONICAL_BUILD
AC_CANONICAL_HOST
AC_PRESERVE_HELP_ORDER

AM_INIT_AUTOMAKE(tar-ustar color-tests)
AM_CONFIG_HEADER(config.h)

# Disable with "./configure --disable-silent-rules" or "make V=1"
AM_SILENT_RULES([yes])

dnl Too many people are not aware of maintainer mode:
dnl If you want to use it, you definitely know what you are doing, so
dnl you can specify "--disable-maintainer-mode". But if you want the default
dnl automake behavior, you've likely never heard of maintainer mode, so we
dnl can't expect you to enable it manually.
AS_IF([test "x${enable_maintainer_mode}" != "xno"],
    [enable_maintainer_mode="yes"])
AM_MAINTAINER_MODE

dnl
dnl Directories
dnl
dnl vlcincludedir="\${includedir}/\${PKGDIR}"
dnl AC_SUBST(vlcincludedir)
vlcdatadir="\${datadir}/\${PKGDIR}"
AC_SUBST(vlcdatadir)
vlclibdir="\${libdir}/\${PKGDIR}"
AC_SUBST(vlclibdir)

dnl
dnl  Save *FLAGS
dnl
VLC_SAVE_FLAGS

dnl
dnl Check for tools
dnl
AC_PROG_CC_C99
AC_USE_SYSTEM_EXTENSIONS
AC_DEFINE([_FORTIFY_SOURCE], 2, [Define to '2' to get glibc warnings.])

AM_PROG_CC_C_O
AC_PROG_CXX
AC_PROG_CPP
AC_PROG_OBJC
_AM_DEPENDENCIES([OBJC])
AC_PROG_EGREP
AC_PROG_MAKE_SET
AC_PROG_INSTALL
AM_PROG_AS

dnl Find the right ranlib, even when cross-compiling
AC_CHECK_TOOL(RANLIB, ranlib, :)
AC_CHECK_TOOL(STRIP, strip, :)
AC_CHECK_TOOL(AR, ar, :)
AC_CHECK_TOOL(LD, ld, :)
AC_CHECK_TOOL(DLLTOOL, dlltool, :)

dnl Check for compiler properties
AC_C_CONST
AC_C_INLINE
AC_C_RESTRICT

dnl Extend the --help string at the current spot.
AC_DEFUN([EXTEND_HELP_STRING], [m4_divert_once([HELP_ENABLE], [$1])])

dnl Allow binary package maintainer to pass a custom string to avoid
dnl cache problem
AC_ARG_WITH(binary-version,
    AS_HELP_STRING([--with-binary-version=STRING],
         [To avoid plugins cache problem between binary version]),[],[])
AS_IF([test -n "${with_binary_version}"],[
    AC_DEFINE_UNQUOTED([DISTRO_VERSION],["${with_binary_version}"],
         [Binary specific version])
])

dnl Check how we are asked to build
AS_IF([test "${enable_shared}" = "no" -a "${enable_vlc}" != "no"], [
  AC_MSG_ERROR([VLC is based on plugins. Shared libraries cannot be disabled.])
])

AC_ARG_ENABLE(static-modules,
  [AS_HELP_STRING([--enable-static-modules],
    [link modules statically - VLC will not work])])
AS_IF([test "${enable_static_modules}" = yes], [
   enable_shared="no"
   enable_static="yes"
   VLC_DEFAULT_PLUGIN_TYPE="builtin"
   AS_IF([test "${enable_vlc}" != "no"],
     [AC_MSG_WARN([Building modules as static. VLC will not work.])])
], [
   VLC_DEFAULT_PLUGIN_TYPE="plugin"
])

AC_SUBST(VLC_DEFAULT_PLUGIN_TYPE)

dnl
dnl  Check for the contrib directory
dnl
AC_ARG_WITH(contrib,
  [AS_HELP_STRING([--without-contrib],
    [do not use the libraries in CONTRIB_DIR])])
AC_ARG_VAR([CONTRIB_DIR], [directory containing pre-built contrib, overriding extras/contrib])
AS_IF([test "${with_contrib}" != "no"],[
  AS_IF([test -z "$CONTRIB_DIR"], [
      topdir="`dirname $0`"
      if test "`echo \"$topdir\" | cut -c 1`" != "/"; then
         topdir="`pwd`/$topdir"
      fi
      CONTRIB_DIR="${topdir}/extras/contrib/hosts/${host}"
      if ! test -d "$CONTRIB_DIR"
      then
        gccmachine=`$CC -dumpmachine`
        CONTRIB_DIR="${topdir}/extras/contrib/hosts/${gccmachine}"
      fi
  ])
  AC_MSG_CHECKING([for libs in ${CONTRIB_DIR}])
  AS_IF([test -d "${CONTRIB_DIR}/lib"],[
    AC_MSG_RESULT([yes])
    AC_SUBST(CONTRIB_DIR)
    export PATH=${CONTRIB_DIR}/bin:$PATH
    CPPFLAGS="${CPPFLAGS} -I${CONTRIB_DIR}/include"
    CPPFLAGS_save="${CPPFLAGS_save} -I${CONTRIB_DIR}/include"
    CFLAGS="${CFLAGS} -I${CONTRIB_DIR}/include"
    CFLAGS_save="${CFLAGS_save} -I${CONTRIB_DIR}/include"
    CXXFLAGS="${CXXFLAGS} -I${CONTRIB_DIR}/include"
    CXXFLAGS_save="${CXXFLAGS_save} -I${CONTRIB_DIR}/include"
    OBJCFLAGS="${OBJCFLAGS} -I${CONTRIB_DIR}/include"
    OBJCFLAGS_save="${OBJCFLAGS_save} -I${CONTRIB_DIR}/include"
    if test "$build" = "$host" -o "$PKG_CONFIG_LIBDIR"; then
        export PKG_CONFIG_PATH="${CONTRIB_DIR}/lib/pkgconfig:$PKG_CONFIG_PATH"
    else
        export PKG_CONFIG_LIBDIR="${CONTRIB_DIR}/lib/pkgconfig"
    fi
    LDFLAGS="${LDFLAGS} -L${CONTRIB_DIR}/lib"
    LDFLAGS_save="${LDFLAGS_save} -L${CONTRIB_DIR}/lib"

    if test "${SYS}" = "darwin"; then
      export LD_LIBRARY_PATH="${CONTRIB_DIR}/lib:$LD_LIBRARY_PATH"
      export DYLD_LIBRARY_PATH="${CONTRIB_DIR}/lib:$DYLD_LIBRARY_PATH"
    fi
  ],[
    AC_MSG_RESULT([no])
    CONTRIB_DIR=""
  ])
])

dnl
dnl  Set default values
dnl
LDFLAGS_vlc="${LDFLAGS}"

dnl
dnl  Check the operating system
dnl
HAVE_WIN64="0"
case "${host_os}" in
  "")
    SYS=unknown
    ;;
  linux*)
    SYS=linux
    ;;
  bsdi*)
    SYS=bsdi
    CFLAGS_save="${CFLAGS_save} -pthread"; CFLAGS="${CFLAGS_save}"
    VLC_ADD_LIBS([vcd cdda vcdx],[-ldvd])
    ;;
  *bsd*)
    SYS="${host_os}"
    CFLAGS_save="${CFLAGS_save} -pthread"; CFLAGS="${CFLAGS_save}"
    case "${host_os}" in
      freebsd*)
        CPPFLAGS_save="${CPPFLAGS_save} -I/usr/local/include"
        CPPFLAGS="${CPPFLAGS_save}"
        LDFLAGS_save="${LDFLAGS_save} -L/usr/local/lib"
        LDFLAGS="${LDFLAGS_save}"
        ;;
      openbsd*)
        CPPFLAGS_save="${CPPFLAGS_save} -I/usr/local/include -I/usr/X11R6/include"
        CPPFLAGS="${CPPFLAGS_save}"
        LDFLAGS_save="${LDFLAGS_save} -L/usr/local/lib -L/usr/X11R6/lib/"
        LDFLAGS="${LDFLAGS_save}"
        ;;
    esac
    ;;
  darwin*)

    dnl Force gcc "-arch" flag
    ARCH_flag=""
    case "${host}" in
      i386*)
        ARCH_flag="-arch i386"
      ;;
      ppc64*)
        ARCH_flag="-arch ppc64"
      ;;
      ppc*)
        ARCH_flag="-arch ppc"
      ;;
      x86_64*)
        ARCH_flag="-arch x86_64"
      ;;
    esac

    SYS=darwin
    CFLAGS_save="${CFLAGS_save} -D_INTL_REDIRECT_MACROS ${ARCH_flag}"; CFLAGS="${CFLAGS_save}"
    CXXFLAGS_save="${CXXFLAGS_save} -D_INTL_REDIRECT_MACROS ${ARCH_flag}"; CXXFLAGS="${CXXFLAGS_save}"
    CPPFLAGS_save="${CPPFLAGS_save} ${ARCH_flag}"; CPPFLAGS="${CPPFLAGS_save}"
    OBJCFLAGS_save="${OBJCFLAGS_save} -D_INTL_REDIRECT_MACROS -std=gnu99 ${ARCH_flag}"; OBJCFLAGS="${OBJCFLAGS_save}"
    LDFLAGS_save="${LDFLAGS_save} -Wl,-headerpad_max_install_names ${ARCH_flag}"; LDFLAGS="${LDFLAGS_save}"
    VLC_ADD_LDFLAGS([mkv mp4 motion], [-Wl,-framework,IOKit,-framework,CoreFoundation])
    VLC_ADD_LDFLAGS([libvlc vlc],[-Wl,-undefined,dynamic_lookup])
    VLC_ADD_LDFLAGS([avcodec avformat access_avio swscale postproc i420_rgb_mmx x264],[-Wl,-read_only_relocs,suppress])
    VLC_ADD_CFLAGS([motion],[-fconstant-cfstrings])
    VLC_ADD_LDFLAGS([libvlccore],[-Wl,-framework,CoreFoundation])
    AC_ARG_ENABLE(macosx-defaults,
      AS_HELP_STRING([--enable-macosx-defaults],[Build the default configuration on Mac OS X (default enabled)]))
    if test "x${enable_macosx_defaults}" != "xno"
    then
        echo ""
        echo "Building with Mac OS X defaults:"
        build_dir=`pwd`
        echo "  Assuming --prefix=${build_dir}/vlc_install_dir"
        ac_default_prefix="${build_dir}/vlc_install_dir"
        enable_faad="yes"
        echo "  Assuming --enable-faad"
        enable_flac="yes"
        echo "  Assuming --enable-flac"
        enable_theora="yes"
        echo "  Assuming --enable-theora"
        enable_shout="yes"
        echo "  Assuming --enable-shout"
        enable_vcdx="yes"
        echo "  Assuming --enable-vcdx"
        enable_caca="yes"
        echo "  Assuming --enable-caca"
        enable_ncurses="yes"
        echo "  Assuming --enable-ncurses"
        enable_twolame="yes"
        echo "  Assuming --enable-twolame"
        enable_realrtsp="yes"
        echo "  Assuming --enable-realrtsp"
        enable_libass="yes"
        echo "  Assuming --enable-libass"

        enable_skins2="no"
        echo "  Assuming --disable-skins2"
        enable_xcb="no"
        echo "  Assuming --disable-xcb"
    fi
    dnl
    dnl  Check for Mac OS X SDK settings
    dnl
    AC_ARG_WITH(macosx-sdk,
      [AS_HELP_STRING([--with-macosx-sdk=DIR],
        [compile using the SDK in DIR])])
    if test "${with_macosx_sdk}" != "" ; then
        CPP="${CPP} -isysroot ${with_macosx_sdk}"
        CC="${CC} -isysroot ${with_macosx_sdk}"
        CXX="${CXX} -isysroot ${with_macosx_sdk}"
        OBJC="${OBJC} -isysroot ${with_macosx_sdk}"
        LD="${LD} -syslibroot ${with_macosx_sdk}"
    else
        echo "  No desired SDK version given, falling back to 10.5"
        CPP="${CPP} -isysroot /Developer/SDKs/MacOSX10.5.sdk"
        CC="${CC} -isysroot /Developer/SDKs/MacOSX10.5.sdk"
        CXX="${CXX} -isysroot /Developer/SDKs/MacOSX10.5.sdk"
        OBJC="${OBJC} -isysroot /Developer/SDKs/MacOSX10.5.sdk"
        LD="${LD} -syslibroot /Developer/SDKs/MacOSX10.5.sdk"
        with_macosx_version_min="10.5"
        echo "  Assuming --with-macosx-version-min=10.5"
    fi
    AC_ARG_WITH(macosx-version-min,
      [AS_HELP_STRING([--with-macosx-version-min=VERSION],
        [compile for MacOS X VERSION and above])])
    if test "${with_macosx_version_min}" != "" ; then
        CPP="${CPP} -mmacosx-version-min=${with_macosx_version_min}"
        CC="${CC} -mmacosx-version-min=${with_macosx_version_min}"
        CXX="${CXX} -mmacosx-version-min=${with_macosx_version_min}"
        OBJC="${OBJC} -mmacosx-version-min=${with_macosx_version_min}"
        LD="${LD} -macosx_version_min=${with_macosx_version_min}"
        CFLAGS_save="${CFLAGS_save} -DMACOSX_DEPLOYMENT_TARGET=${with_macosx_version_min}"; CFLAGS="${CFLAGS_save}"
        CXXFLAGS_save="${CXXFLAGS_save} -DMACOSX_DEPLOYMENT_TARGET=${with_macosx_version_min}"; CXXFLAGS="${CXXFLAGS_save}"
        OBJCFLAGS_save="${OBJCFLAGS_save} -DMACOSX_DEPLOYMENT_TARGET=${with_macosx_version_min}"; OBJCFLAGS="${OBJCFLAGS_save}"
        MACOSX_DEPLOYMENT_TARGET=${with_macosx_version_min}
        export MACOSX_DEPLOYMENT_TARGET
    fi
    ;;
  *mingw32* | *cygwin* | *wince* | *mingwce*)
    AC_CHECK_TOOL(WINDRES, windres, :)
    AC_CHECK_TOOL(OBJCOPY, objcopy, :)

    case "${host_os}" in
      *wince* | *mingwce* | *mingw32ce*)
        SYS=mingwce
        dnl Sadly CeGCC still needs non-wince macros
        AC_DEFINE([_WIN32_WINNT], 0x0501, [Define to '0x0500' for Windows 2000 APIs.])
        ;;
      *mingw32*)
        SYS=mingw32
        AC_DEFINE([_WIN32_WINNT], 0x0501, [Define to '0x0500' for Windows XP APIs.])
        ;;
      *cygwin*)
        dnl Check if we are using the mno-cygwin mode in which case we are
        dnl actually dealing with a mingw32 compiler.
        AC_DEFINE([_WIN32_WINNT], 0x0501, [Define to '0x0501' for Windows XP APIs.])
        AC_EGREP_CPP(yes,
            [#ifdef WIN32
             yes
             #endif],
            SYS=mingw32, AC_MSG_ERROR([VLC requires -mno-cygwin]))
        ;;
    esac

    if test "${SYS}" = "mingw32"; then
        # add ws2_32 for closesocket, select, recv
        VLC_ADD_LIBS([libvlccore],[-lws2_32 -lnetapi32 -lwinmm])
        VLC_ADD_LDFLAGS([vlc],[-mwindows])
        VLC_ADD_LIBS([win32text],[-lgdi32])
        VLC_ADD_LIBS([cdda vcdx sdl_image aout_sdl vout_sdl],[-lwinmm])
        VLC_ADD_LIBS([access_http access_mms access_udp access_tcp access_ftp access_rtmp access_output_udp access_output_shout access_output_rtmp sap stream_out_standard stream_out_select stream_out_rtp stream_out_raop vod_rtsp access_realrtsp rtp oldrc netsync gnutls growl_udp flac ts audioscrobbler lua remoteosd zvbi audiobargraph_a netsync],[-lws2_32])
        VLC_ADD_LIBS([filesystem], [-lshlwapi])
        dnl
        dnl DEP and ASLR options
        dnl
        AC_ARG_WITH(peflags,
          [AS_HELP_STRING([--with-peflags],
            [use peflags (default enabled on Windows)])])
        if test "${with_peflags}" != "no" ; then
          AC_PATH_TOOL(PEFLAGS, peflags, :)
        fi
        AC_CHECK_PROGS(U2D, [unix2dos todos], unix2dos)
        ac_default_prefix="`pwd`/_win32"
        DESTDIR="`pwd`/_win32/"

        dnl
        dnl NSIS Installer prefix and WIN64
        dnl
        case "${host}" in
            amd64*|i686-w64*|x86_64*)
                HAVE_WIN64="1"
                PROGRAMFILES="PROGRAMFILES64"
            ;;
            *)
                PROGRAMFILES="PROGRAMFILES"
            ;;
        esac
        AC_SUBST(PROGRAMFILES)

    fi
    if test "${SYS}" = "mingwce"; then
        # add ws2 for closesocket, select, recv
        VLC_ADD_LIBS([libvlccore access_http access_mms access_udp access_tcp access_ftp access_rtmp access_output_udp access_output_rtmp sap netsync audioscrobbler growl rtp stream_out_standard stream_out_select stream_out_rtp remoteosd ts audiobargraph_a netsync],[-lws2])
        VLC_ADD_LIBS([libvlccore],[-lmmtimer])
        AC_CHECK_PROGS(U2D, [unix2dos todos], unix2dos)
        ac_default_prefix="`pwd`/_wince"
        DESTDIR="`pwd`/_wince/"
    fi
    ;;
  *nto*)
    SYS=nto
    ;;
  solaris*)
    SYS=solaris
    ;;
  hpux*)
    SYS=hpux
    ;;
  symbian*)
    SYS=symbian
    ;;
  *os2*)
    SYS=os2
    LDFLAGS_save="${LDFLAGS_save} -Zomf -Zbin-files -Zargs-wild"; LDFLAGS="${LDFLAGS_save}"
    ;;
  *)
    SYS="${host_os}"
    ;;
esac
AM_CONDITIONAL(HAVE_DARWIN,  test "${SYS}" = "darwin")
AM_CONDITIONAL(HAVE_LINUX,   test "${SYS}" = "linux")
AM_CONDITIONAL(HAVE_OS2,     test "${SYS}" = "os2")
AM_CONDITIONAL(HAVE_WIN32,   test "${SYS}" = "mingw32")
AM_CONDITIONAL(HAVE_WIN64,   test "${HAVE_WIN64}" = "1")
AM_CONDITIONAL(HAVE_WINCE,   test "${SYS}" = "mingwce")
AM_CONDITIONAL(HAVE_SYMBIAN, test "${SYS}" = "symbian")
AM_CONDITIONAL(USE_PEFLAGS,  test "${with_peflags}" = "yes")

dnl
dnl Sadly autoconf doesn't think about testing foo.exe when ask to test
dnl for program foo on win32

case "${build_os}" in
    cygwin|msys)
        ac_executable_extensions=".exe"
    ;;
    *)
    ;;
esac

dnl
dnl  Libtool
dnl  It's very bad, but our former custom system was worst
dnl  -- Courmisch
dnl

dnl override platform specific check for dependent libraries
dnl otherwise libtool linking of shared libraries will
dnl fail on anything other than pass_all.
AC_CACHE_VAL(lt_cv_deplibs_check_method,
    [lt_cv_deplibs_check_method=pass_all])

AC_DISABLE_STATIC
dnl AC_DISABLE_FAST_INSTALL
AC_LIBTOOL_DLOPEN
AC_LIBTOOL_WIN32_DLL
m4_undefine([AC_PROG_F77])
m4_defun([AC_PROG_F77],[])
AC_PROG_LIBTOOL

m4_undefine([AC_DEPLIBS_CHECK_METHOD])
m4_defun([AC_DEPLIBS_CHECK_METHOD],[])

lt_cv_deplibs_check_method=pass_all

dnl
dnl Gettext stuff
dnl
AM_GNU_GETTEXT_VERSION([0.18.1])
AM_GNU_GETTEXT([external])
VLC_ADD_LIBS([libvlccore vlc], [${LTLIBINTL}])

dnl
dnl Iconv stuff
dnl
AM_ICONV
VLC_ADD_CFLAGS([libvlccore],[${INCICONV}])
VLC_ADD_LIBS([libvlccore],[${LTLIBICONV}])

dnl Check for broken versions of mingw-runtime compatability library
AS_IF([test "${SYS}" = "mingw32" -o "${SYS}" = "mingwce"], [
    AC_MSG_CHECKING(for broken mingw-runtime)
    AC_PREPROC_IFELSE([AC_LANG_SOURCE([
#include <_mingw.h>
#if (__MINGW32_MAJOR_VERSION == 3) && (__MINGW32_MINOR_VERSION < 15)
#ifndef __MINGW64_VERSION_MAJOR
# error Attempting to use mingw-runtime with broken vsnprintf support
#endif
#endif
    ])], [
        AC_MSG_RESULT([ok])
    ], [
        AC_MSG_RESULT([present])
        AC_MSG_ERROR([LibVLC requires mingw-runtime version 3.15 or higher!])
    ])
    dnl force use of mingw provided c99 *printf over msvcrt
    CPPFLAGS="${CPPFLAGS} -D__USE_MINGW_ANSI_STDIO=1"
    CPPFLAGS_save="${CPPFLAGS_save} -D__USE_MINGW_ANSI_STDIO=1"
])

dnl Check for the need to include the mingwex lib for mingw32
if test "${SYS}" = "mingw32" ; then
    AC_CHECK_LIB(mingwex,opendir,
        AC_CHECK_LIB(mingw32,opendir,,
            [VLC_ADD_LIBS([libvlccore],[-lmingwex])])
    )
fi

dnl Check for fnative-struct or mms-bitfields support for mingw32
if test "${SYS}" = "mingw32" ; then
    AC_CACHE_CHECK([if \$CC accepts -mms-bitfields],
        [ac_cv_c_mms_bitfields],
        [CFLAGS="${CFLAGS_save} -mms-bitfields"
         AC_TRY_COMPILE([],,ac_cv_c_mms_bitfields=yes, ac_cv_c_mms_bitfields=no)])
    if test "${ac_cv_c_mms_bitfields}" != "no"; then
        CFLAGS_save="${CFLAGS_save} -mms-bitfields";
        CXXFLAGS_save="${CXXFLAGS_save} -mms-bitfields";
    else
        AC_CACHE_CHECK([if \$CC accepts -fnative-struct],
            [ac_cv_c_fnative_struct],
            [CFLAGS="${CFLAGS_save} -fnative-struct"
             AC_TRY_COMPILE([],,ac_cv_c_fnative_struct=yes, ac_cv_c_fnative_struct=no)])
        if test "${ac_cv_c_fnative_struct}" != "no"; then
            CFLAGS_save="${CFLAGS_save} -fnative-struct";
            CXXFLAGS_save="${CXXFLAGS_save} -fnative-struct";
        fi
    fi

    CFLAGS="${CFLAGS_save}"; CXXFLAGS="${CXXFLAGS_save}"
fi

dnl Check for fvtable-thunks support for mingw32
if test "${SYS}" = "mingw32" -a "${CXX}" != "" ; then
    AC_LANG_PUSH(C++)
    AC_CACHE_CHECK([if \$CXX accepts -fvtable-thunks],
        [ac_cv_cxx_fvtable_thunks],
        [CXXFLAGS="${CXXFLAGS_save} -Wall -Werror -fvtable-thunks"
         AC_TRY_COMPILE([],,ac_cv_cxx_fvtable_thunks=yes,
                        ac_cv_cxx_fvtable_thunks=no)])
    if test "${ac_cv_cxx_fvtable_thunks}" = "yes"; then
        CXXFLAGS_mingw32_special="-fvtable-thunks"
    fi

    CXXFLAGS_save="${CXXFLAGS_save} ${CXXFLAGS_mingw32_special}"; CXXFLAGS="${CXXFLAGS_save}"
    AC_LANG_POP(C++)
fi

dnl
dnl Buggy glibc prevention. Purposedly not cached.
dnl See sourceware.org bugs 5058 and 5443.
dnl Ubuntu alone has 20 bug numbers for this...
dnl
AC_MSG_CHECKING(for buggy GNU/libc versions)
AC_PREPROC_IFELSE([AC_LANG_SOURCE([
#include <limits.h>
#if defined (__GLIBC__) && (__GLIBC__ == 2) \
  && (__GLIBC_MINOR__ >= 5) && (__GLIBC_MINOR__ <= 7)
# error GNU/libc with dcgettext killer bug!
#endif
])], [
  AC_MSG_RESULT([not present])
], [
  AC_MSG_RESULT([found])
  AS_IF([test "x${enable_nls}" != "xno"], [
    AC_MSG_ERROR([Buggy GNU/libc (version 2.5 - 2.7) present. VLC would crash; there is no viable
work-around for this. Check with your distribution vendor on how to update the
glibc run-time. Alternatively, build with --disable-nls.])
  ], [
    AC_DEFINE(DISABLE_BUGGY_GLIBC_CHECK, 1, [Disables runtime check for buggy glibc.])
  ])
])

dnl Plugin compilation stuff

VLC_LIBRARY_SUFFIX

dnl The -DSYS_FOO flag
CPPFLAGS_save="${CPPFLAGS_save} -DSYS_`echo ${SYS} | sed -e 's/-.*//' | tr 'abcdefghijklmnopqrstuvwxyz.' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ_'`"; CPPFLAGS="${CPPFLAGS_save}"

dnl Check for system libs needed
need_libc=false

dnl Check for usual libc functions
AC_CHECK_FUNCS([daemon fcntl fdopendir fstatvfs fork getenv getpwuid_r gettimeofday isatty lstat memalign mmap openat pread posix_fadvise posix_madvise posix_memalign setlocale stricmp strnicmp uselocale])
AC_REPLACE_FUNCS([asprintf atof atoll dirfd getcwd getdelim getpid gmtime_r lldiv localtime_r nrand48 rewind setenv strcasecmp strcasestr strdup strlcpy strncasecmp strndup strnlen strsep strtof strtok_r strtoll swab tdestroy vasprintf])
AC_CHECK_FUNCS(fdatasync,,
  [AC_DEFINE(fdatasync, fsync, [Alias fdatasync() to fsync() if missing.])
])

# Windows CE doesn't have strcoll()
AC_FUNC_STRCOLL

dnl Check for non-standard system calls
AC_CHECK_FUNCS([accept4 pipe2 eventfd vmsplice sched_getaffinity])

AH_BOTTOM([#include <vlc_fixups.h>])

SOCKET_LIBS=""
AC_CHECK_FUNCS(connect,,[
  AC_CHECK_LIB(socket,connect,[
    VLC_ADD_LIBS([libvlccore cdda],-lsocket)
    SOCKET_LIBS="-lsocket"
  ])
])
AC_SUBST(SOCKET_LIBS)

AC_CHECK_FUNCS(send,,[
  AC_CHECK_LIB(socket,send,[
    VLC_ADD_LIBS([access_http access_mms access_udp access_tcp access_ftp access_rtmp sap access_output_udp access_output_rtmp stream_out_standard growl_udp remoteosd netsync],[-lsocket])
  ])
])


dnl Check for socklen_t
AH_TEMPLATE(socklen_t, [Define to `int' if <sys/socket.h> does not define.])
AC_CACHE_CHECK([for socklen_t in sys/socket.h],
ac_cv_type_socklen_t,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
[#include <sys/types.h>
#ifdef WIN32
# include <winsock2.h>
# include <ws2tcpip.h>
#else
# include <sys/socket.h>
#endif]], [[socklen_t len; len = 0;]])],
ac_cv_type_socklen_t=yes,
ac_cv_type_socklen_t=no)])
AS_IF([test "$ac_cv_type_socklen_t" = no],
 [AC_DEFINE(socklen_t, int)])

dnl Check for struct sockaddr_storage
AH_TEMPLATE(sockaddr_storage, [Define to `sockaddr' if <sys/socket.h> does not define.])
AH_TEMPLATE(ss_family, [Define to `sa_family' if <sys/socket.h> does not define.])
AC_CACHE_CHECK([for struct sockaddr_storage], ac_cv_struct_sockaddr_storage,
  [AC_TRY_COMPILE(
    [#include <sys/types.h>
     #if defined( UNDER_CE )
     # include <winsock2.h>
     #elif defined( WIN32 )
     # include <winsock2.h>
     #else
     # include <sys/socket.h>
     #endif], [struct sockaddr_storage addr;],
     ac_cv_struct_sockaddr_storage=yes,
     ac_cv_struct_sockaddr_storage=no)])
AS_IF([test "${ac_cv_struct_sockaddr_storage}" = no], [
  AC_DEFINE(sockaddr_storage, sockaddr)
  AC_DEFINE(ss_family, sa_family)
])

dnl getaddrinfo, getnameinfo and gai_strerror check
dnl  -lnsl and -lsocket are needed on Solaris;
dnl  we purposedly make the test fail on Windows
LIBS_save="${LIBS}"
AC_SEARCH_LIBS([getaddrinfo], [nsl],,, [${SOCKET_LIBS}])
LIBS="${LIBS_save}"

dnl Check for va_copy
AC_CACHE_CHECK([for va_copy], ac_cv_c_va_copy,
  AC_TRY_LINK(
    [#include <stdarg.h>],
    [va_list ap1, ap2; va_copy(ap1,ap2);],
    [ac_cv_c_va_copy="yes"],
    [ac_cv_c_va_copy="no"]))
if test "${ac_cv_c_va_copy}" = "yes"; then
  AC_DEFINE(HAVE_VA_COPY, 1, [Define if <stdarg.h> defines va_copy.])
fi
AC_CACHE_CHECK([for __va_copy], ac_cv_c___va_copy,
  AC_TRY_LINK(
    [#include <stdarg.h>],
    [va_list ap1, ap2; __va_copy(ap1,ap2);],
    [ac_cv_c___va_copy="yes"],
    [ac_cv_c___va_copy="no"]))
if test "${ac_cv_c___va_copy}" = "yes"; then
  AC_DEFINE(HAVE___VA_COPY, 1, [Define if <stdarg.h> defines __va_copy.])
fi

AC_CHECK_FUNCS(inet_aton,,[
  AC_CHECK_LIB(resolv,inet_aton,[
    VLC_ADD_LIBS([libvlccore],[-lresolv])
  ])
])

dnl FreeBSD has a gnugetopt library for this:
GNUGETOPT_LIBS=""
AC_CHECK_FUNC(getopt_long,, [
  AC_CHECK_LIB([gnugetopt],[getopt_long], [
    GNUGETOPT_LIBS="-lgnugetopt"
  ])
])
AC_SUBST(GNUGETOPT_LIBS)

if test "${SYS}" != "mingw32" -a "${SYS}" != "mingwce"; then
AC_CHECK_LIB(m,cos,[
  VLC_ADD_LIBS([adjust wave ripple psychedelic gradient a52tofloat32 dtstofloat32 x264 goom visual panoramix rotate noise grain scene kate flac lua chorus_flanger],[-lm])
])
AC_CHECK_LIB(m,pow,[
  VLC_ADD_LIBS([avcodec avformat access_avio swscale postproc ffmpegaltivec i420_rgb faad twolame equalizer spatializer param_eq libvlccore freetype mod mpc dmo quicktime realvideo qt4],[-lm])
])
AC_CHECK_LIB(m,sqrt,[
  VLC_ADD_LIBS([compressor headphone_channel_mixer normvol audiobargraph_a speex mono colorthres extract ball],[-lm])
])
AC_CHECK_LIB(m,ceil,[
  VLC_ADD_LIBS([access_imem hotkeys mosaic],[-lm])
])
AC_CHECK_LIB(m,exp,[
  VLC_ADD_LIBS([gaussianblur],[-lm])
])
AC_CHECK_LIB(m,round,[
  VLC_ADD_LIBS([dbus],[-lm])
])
AC_CHECK_LIB(m,sqrtf,[
  VLC_ADD_LIBS([x264],[-lm])
])
fi # end "${SYS}" != "mingw32" -a "${SYS}" != "mingwce"

AC_CHECK_LIB(m,lrintf, [
  AC_DEFINE(HAVE_LRINTF, 1, [Define to 1 if you have the lrintf function])
  VLC_ADD_LIBS([skins2],[-lm])
])

dnl Check for dynamic plugins
ac_cv_have_plugins=no

# HP-UX style
if test "${ac_cv_have_plugins}" = "no"; then
  AC_CHECK_HEADERS(dl.h)
  ac_cv_my_have_shl_load=no
  AC_CHECK_FUNC(shl_load,
   [ac_cv_my_have_shl_load=yes,
    AC_CHECK_LIB(dld, shl_load,
     [ac_cv_my_have_shl_load=yes
      VLC_ADD_LIBS([libvlccore],[-ldld])])])
  if test "${ac_cv_my_have_shl_load}" = "yes"; then
    AC_DEFINE(HAVE_DL_SHL_LOAD, 1, [Define if you have the shl_load API])
    ac_cv_have_plugins=yes
  fi
fi

# Win32 style
if test "${ac_cv_have_plugins}" = "no"; then
  if test "${SYS}" = "mingw32" ; then
    AC_CHECK_LIB(kernel32, main,
     [VLC_ADD_LIBS([libvlccore],[-lkernel32])
      AC_DEFINE(HAVE_DL_WINDOWS, 1, [Define if you have Windows' LoadLibrary])
      ac_cv_have_plugins=yes])
  fi
fi

# WinCE style
if test "${ac_cv_have_plugins}" = "no"; then
  if test "${SYS}" = "mingwce"; then
    AC_DEFINE(HAVE_DL_WINDOWS, 1, [Define if you have Windows' LoadLibrary])
    ac_cv_have_plugins=yes
  fi
fi

# Only test for dlopen() if the others didn't work
LIBDL=""
if test "${ac_cv_have_plugins}" = "no" -o "${SYS}" = "darwin"; then
  AC_CHECK_HEADERS(dlfcn.h sys/dl.h)
  ac_cv_my_have_dlopen=no
  AC_CHECK_FUNC(dlopen, [
    ac_cv_my_have_dlopen=yes
  ], [
    AC_CHECK_LIB(dl, dlopen, [
      ac_cv_my_have_dlopen=yes
      LIBDL="-ldl"
    ], [
      AC_CHECK_LIB(svld, dlopen, [
        ac_cv_my_have_dlopen=yes
        LIBDL="-lsvld"
      ])
    ])
  ])
  if test "${ac_cv_my_have_dlopen}" = "yes"; then
    AC_DEFINE(HAVE_DL_DLOPEN, 1, [Define if you have the dlopen API])
    ac_cv_have_plugins=yes
    VLC_ADD_LIBS([libvlccore realvideo lua],[$LIBDL])
  fi
fi
AC_SUBST(LIBDL)

if test "${SYS}" != "mingw32" -a "${SYS}" != "mingwce"; then
  dnl Check for pthreads - borrowed from XMMS
  THREAD_LIB=error
  if test "${THREAD_LIB}" = "error"; then
    AC_CHECK_LIB(pthread,main,THREAD_LIB="-lpthread")
  fi
  if test "${THREAD_LIB}" = "error"; then
    AC_CHECK_LIB(pthreads,main,THREAD_LIB="-lpthreads")
  fi
  if test "${THREAD_LIB}" = "error"; then
    AC_CHECK_LIB(c_r,main,THREAD_LIB="-lc_r")
  fi
  if test "${THREAD_LIB}" = "error"; then
    AC_CHECK_FUNCS(pthread_mutex_lock)
    THREAD_LIB=""
  fi

  VLC_ADD_LIBS([libvlccore libvlc vlc plugin],[${THREAD_LIB}])

  AC_CHECK_LIB(rt, clock_nanosleep, [
    VLC_ADD_LIBS([libvlccore],[-lrt])
    AC_DEFINE(HAVE_CLOCK_NANOSLEEP, 1, [Define to 1 if you have clock_nanosleep.])
  ], [
    dnl HP/UX port
    AC_CHECK_LIB(rt,sem_init, [VLC_ADD_LIBS([libvlccore],[-lrt])])
  ])

  have_nanosleep=false
  AC_CHECK_FUNCS(nanosleep,have_nanosleep=:,[
    AC_CHECK_LIB(rt,nanosleep,
      [VLC_ADD_LIBS([libvlccore],[-lrt]) have_nanosleep=:],
      [AC_CHECK_LIB(posix4,nanosleep,
          [VLC_ADD_LIBS([libvlccore],[-lposix4]) have_nanosleep=:])]
    )
  ])
  if ${have_nanosleep}; then
    AC_DEFINE(HAVE_NANOSLEEP, 1, [Define if nanosleep is available.])
  fi
fi # end "${SYS}" != "mingw32" -a "${SYS}" != "mingwce"

dnl Check for misc headers
AC_MSG_CHECKING(for strncasecmp in strings.h)
AC_EGREP_HEADER(strncasecmp,strings.h,[
  AC_MSG_RESULT(yes)
  AC_DEFINE(STRNCASECMP_IN_STRINGS_H, 1,
            Define if <strings.h> defines strncasecmp.)],[
  AC_MSG_RESULT(no)])

dnl Check for headers
AC_CHECK_HEADERS([search.h])
AC_CHECK_HEADERS(getopt.h strings.h locale.h xlocale.h)
AC_CHECK_HEADERS(fcntl.h sys/time.h sys/ioctl.h sys/stat.h)
AC_CHECK_HEADERS([arpa/inet.h netinet/in.h netinet/udplite.h sys/eventfd.h])
AC_CHECK_HEADERS([net/if.h], [], [],
  [
    #include <sys/types.h>
    #include <sys/socket.h>
  ])
AC_CHECK_HEADERS([sys/mount.h], [], [],
  [
    #include <sys/param.h>
  ])

if test "${SYS}" != "mingw32" -a "${SYS}" != "mingwce"; then
  AC_CHECK_HEADERS(machine/param.h sys/shm.h)
  AC_CHECK_HEADERS([linux/version.h linux/dccp.h scsi/scsi.h linux/magic.h])
  AC_CHECK_HEADERS(syslog.h)
fi # end "${SYS}" != "mingw32" -a "${SYS}" != "mingwce"

dnl LP64 and LLP64 architectures had better define ssize_t by themselves...
AH_TEMPLATE(ssize_t, [Define to `int' if <stddef.h> does not define.])
AC_CHECK_TYPE(ssize_t,, [
  AC_DEFINE(ssize_t, int)
])

dnl Check for poll
AC_SEARCH_LIBS(poll, [poll], [AC_DEFINE(HAVE_POLL, 1, [Define to 1 if the OS is usabl... err, has poll().])], [
if test ${SYS} != "mingw32" -a ${SYS} != "mingwce"
then
    AC_MSG_WARN([Your platform does not support poll(). VLC has it's own poll() implementation, but it is only intended to be used on Windows. VLC might crash or be insecure when you see this message. Either switch to an OS with a proper poll() implementation, or implement one for your OS in VLC])
fi
])

dnl Mac OS X and other OSes don't have declaration for nanosleep
if test "${SYS}" != "mingw32" -a "${SYS}" != "mingwce"; then
  AC_MSG_CHECKING(for nanosleep in time.h)
  AC_EGREP_HEADER(nanosleep,time.h,[
    AC_MSG_RESULT(yes)
    AC_DEFINE(HAVE_DECL_NANOSLEEP, 1,
              Define if <time.h> defines nanosleep.)
  ],[
    AC_MSG_RESULT(no)
  ])
fi # end "${SYS}" != "mingw32" -a "${SYS}" != "mingwce"

dnl Make sure we have timespecs
AC_MSG_CHECKING(for timespec in sys/time.h)
AC_EGREP_HEADER(timespec,sys/time.h,[
  AC_MSG_RESULT(yes)
  AC_DEFINE(HAVE_STRUCT_TIMESPEC, 1,
            Define if <sys/time.h> defines struct timespec.)
],[
  AC_MSG_RESULT(no)
])

dnl Check for threads library
if test "${SYS}" != "mingw32" -a "${SYS}" != "mingwce"; then
  AC_CHECK_HEADERS(pthread.h)
fi # end "${SYS}" != "mingw32" -a "${SYS}" != "mingwce"

dnl It seems that autoconf detects pkg-config only during the first
dnl PKG_CHECK_MODULES from configure.ac - which makes sense. But in our case,
dnl it is nested within a conditional block, so it was not working right.
dnl Make PKG_CONFIG_PATH precious so that it appears in the help and get saved
AC_ARG_VAR(PKG_CONFIG_PATH,
       [Paths where to find .pc not at the default location])
PKG_PROG_PKG_CONFIG()

dnl On some OS we need static linking 
AS_IF([test -n "${PKG_CONFIG}" ],[
    AS_IF([test "${SYS}" = "mingw32" -o "${SYS}" = "mingwce" -o "${SYS}" = "darwin" ],[
        PKG_CONFIG="${PKG_CONFIG} --static"
    ])
])


dnl
dnl Check for zlib.h and -lz along with system -lminizip if available
dnl
AC_CHECK_HEADERS(zlib.h, [ have_zlib=yes ], [ have_zlib=no ])
AM_CONDITIONAL(HAVE_ZLIB, [ test "${have_zlib}" = "yes" ])
if test "${have_zlib}" = "yes"
then
  VLC_ADD_LIBS([access_http mp4 skins2 sap mkv unzip zip],[-lz])
  PKG_CHECK_MODULES([MINIZIP], [minizip] , [ have_minizip=yes ], [
    AC_CHECK_HEADERS([unzip.h], [ 
      have_minizip=yes
      MINIZIP_LIBS="-lminizip -lz"
    ], [
      have_minizip=no
      MINIZIP_CFLAGS="-I\\\${top_srcdir}/libs/unzip"
      MINIZIP_LIBS="\\\${top_builddir}/libs/unzip/libunzip.la"
    ])
  ])
  VLC_ADD_CPPFLAGS([skins2],[$MINIZIP_CFLAGS])
  VLC_ADD_CFLAGS([zip],[$MINIZIP_CFLAGS])
  VLC_ADD_LIBS([skins2 zip],[$MINIZIP_LIBS])
  VLC_ADD_PLUGIN([unzip zip])
fi
AM_CONDITIONAL(HAVE_MINIZIP, [ test "${have_minizip}" = "yes" ])


dnl Manual switch for UTF-8
AC_ARG_ENABLE(non-utf8,
  [AS_HELP_STRING([--enable-non-utf8],
    [support legacy non-UTF-8 systems (default disabled)])],, [
  AS_IF([test "${SYS}" = "mingw32" -o "${SYS}" = "mingwce"], [
    enable_non_utf8="no"
  ])
])
AS_IF([test "${enable_non_utf8}" != "no"], [
  AC_DEFINE([ASSUME_UTF8], [1],
            [Define to 1 if the operating system uses UTF-8 internally])
])


dnl Check for dbus
AC_ARG_ENABLE(dbus,
  [AS_HELP_STRING([--enable-dbus],
    [compile D-Bus message bus support (default enabled)])])
case "${SYS}" in
    linux*|*bsd*)
if test "${enable_dbus}" != "no" -a "${SYS}" != "mingw32" -a "${SYS}" != "mingwce"
then
  dnl api stable dbus
  PKG_CHECK_MODULES(DBUS, dbus-1 >= 1.0.0,
    [ AC_DEFINE( HAVE_DBUS, 1, [Define if you have the D-BUS library] )
      VLC_ADD_LIBS([libvlccore],[$DBUS_LIBS])
      VLC_ADD_CFLAGS([libvlccore],[$DBUS_CFLAGS])
      dnl Check for dbus control interface
        AC_ARG_ENABLE(dbus-control,
          [AS_HELP_STRING([--disable-dbus-control],
            [D-Bus control interface (default enabled)])])
        if test "${enable_dbus_control}" != "no"
        then
          VLC_ADD_PLUGIN([dbus])
          VLC_ADD_LIBS([dbus],[$DBUS_LIBS])
          VLC_ADD_CFLAGS([dbus],[$DBUS_CFLAGS])
        fi
      dnl Check for Telepathy
        AC_ARG_ENABLE(telepathy,
          AS_HELP_STRING([--enable-telepathy],[Telepathy Presence plugin through DBus(default enabled)]))
        if test "${enable_telepathy}" != "no"; then
          VLC_ADD_PLUGIN([telepathy])
          VLC_ADD_LIBS([telepathy],[$DBUS_LIBS])
          VLC_ADD_CFLAGS([telepathy],[$DBUS_CFLAGS])
        fi
        dnl Power Management Inhibiter
        VLC_ADD_PLUGIN([inhibit])
        VLC_ADD_LIBS([inhibit],[$DBUS_LIBS])
        VLC_ADD_CFLAGS([inhibit],[$DBUS_CFLAGS])
    ],
    [AC_MSG_ERROR([Couldn't find DBus >= 1.0.0, install libdbus-dev ?])]
  )
fi
;;
esac