configure

#!/bin/sh
#
# FFmpeg configure script
#
# Copyright (c) 2000, 2001, 2002 Fabrice Bellard
# Copyright (c) 2005-2006 Diego Biurrun
# Copyright (c) 2005-2006 Mans Rullgard
#

# make sure we are running under a compatible shell
# try to make this part work with most shells

try_exec(){
    echo "Trying shell $1"
    type "$1" >/dev/null 2>&1 && exec "$@"
}

unset foo
(: ${foo%%bar}) 2>/dev/null
E1="$?"

(: ${foo?}) 2>/dev/null
E2="$?"

if test "$E1" != 0 || test "$E2" = 0; then
    echo "Broken shell detected.  Trying alternatives."
    export FF_CONF_EXEC
    if test "0$FF_CONF_EXEC" -lt 1; then
        FF_CONF_EXEC=1
        try_exec bash "$0" "$@"
    fi
    if test "0$FF_CONF_EXEC" -lt 2; then
        FF_CONF_EXEC=2
        try_exec ksh "$0" "$@"
    fi
    if test "0$FF_CONF_EXEC" -lt 3; then
        FF_CONF_EXEC=3
        try_exec /usr/xpg4/bin/sh "$0" "$@"
    fi
    echo "No compatible shell script interpreter found."
    echo "This configure script requires a POSIX-compatible shell"
    echo "such as bash or ksh."
    echo "THIS IS NOT A BUG IN FFMPEG, DO NOT REPORT IT AS SUCH."
    echo "Instead, install a working POSIX-compatible shell."
    echo "Disabling this configure test will create a broken FFmpeg."
    if test "$BASH_VERSION" = '2.04.0(1)-release'; then
        echo "This bash version ($BASH_VERSION) is broken on your platform."
        echo "Upgrade to a later version if available."
    fi
    exit 1
fi

show_help(){
  echo "Usage: configure [options]"
  echo "Options: [defaults in brackets after descriptions]"
  echo
  echo "Standard options:"
  echo "  --help                   print this message"
  echo "  --log[=FILE|yes|no]      log tests and output to FILE [config.err]"
  echo "  --prefix=PREFIX          install in PREFIX [$PREFIX]"
  echo "  --libdir=DIR             install libs in DIR [PREFIX/lib]"
  echo "  --shlibdir=DIR           install shared libs in DIR [PREFIX/lib]"
  echo "  --incdir=DIR             install includes in DIR [PREFIX/include/ffmpeg]"
  echo "  --mandir=DIR             install man page in DIR [PREFIX/man]"
  echo "  --enable-mingw32         enable MinGW native/cross Windows compile"
  echo "  --enable-mingwce         enable MinGW native/cross WinCE compile"
  echo "  --enable-static          build static libraries [default=yes]"
  echo "  --disable-static         do not build static libraries [default=no]"
  echo "  --enable-shared          build shared libraries [default=no]"
  echo "  --disable-shared         do not build shared libraries [default=yes]"
  echo "  --enable-pp              enable GPLed postprocessing support [default=no]"
  echo "  --enable-swscaler        software scaler support [default=no]"
  echo "  --enable-sunmlib         use Sun medialib [default=no]"
  echo "  --enable-beosthreads     use BeOS threads [default=no]"
  echo "  --enable-os2threads      use OS/2 threads [default=no]"
  echo "  --enable-pthreads        use pthreads [default=no]"
  echo "  --enable-w32threads      use Win32 threads [default=no]"
  echo "  --enable-x11grab         enable X11 grabbing [default=no]"
  echo "  --enable-dc1394          enable IIDC-1394 grabbing using libdc1394"
  echo "                           and libraw1394 [default=no]"
  echo "  --enable-a52bin          open liba52.so.0 at runtime [default=no]"
  echo "  --enable-avisynth        allow reading AVISynth script files [default=no]"
  echo "  --enable-dts             enable GPLed libdts support [default=no]"
  echo "  --enable-faac            enable FAAC support via libfaac [default=no]"
  echo "  --enable-faad            enable FAAD support via libfaad [default=no]"
  echo "  --enable-faadbin         build FAAD support with runtime linking [default=no]"
  echo "  --enable-libgsm          enable GSM support via libgsm [default=no]"
  echo "  --enable-mp3lame         enable MP3 encoding via libmp3lame [default=no]"
  echo "  --enable-libnut          enable NUT (de)muxing via libnut,"
  echo "                           native demuxer exists [default=no]"
  echo "  --enable-libogg          enable Ogg muxing via libogg [default=no]"
  echo "  --enable-libtheora       enable Theora encoding via libtheora [default=no]"
  echo "  --enable-vorbis          enable Vorbis en/decoding via libvorbis,"
  echo "                           native implementations exist [default=no]"
  echo "  --enable-x264            enable H.264 encoding via x264 [default=no]"
  echo "  --enable-xvid            enable Xvid encoding via xvidcore,"
  echo "                           native MPEG-4/Xvid encoder exists [default=no]"
  echo "  --enable-amr_nb          enable amr_nb float audio codec"
  echo "  --enable-amr_nb-fixed    use fixed point for amr-nb codec"
  echo "  --enable-amr_wb          enable amr_wb float audio codec"
  echo "  --enable-amr_if2         enable amr_wb IF2 audio codec"
  echo "  --enable-gpl             allow use of GPL code, the resulting libav*"
  echo "                           and ffmpeg will be under GPL [default=no]"
  echo ""
  echo "Advanced options (experts only):"
  echo "  --source-path=PATH       path to source code [$source_path]"
  echo "  --cross-prefix=PREFIX    use PREFIX for compilation tools [$cross_prefix]"
  echo "  --cross-compile          assume a cross-compiler is used"
  echo "  --cc=CC                  use C compiler CC [$cc]"
  echo "  --make=MAKE              use specified make [$make]"
  echo "  --extra-cflags=ECFLAGS   add ECFLAGS to CFLAGS [$CFLAGS]"
  echo "  --extra-ldflags=ELDFLAGS add ELDFLAGS to LDFLAGS [$LDFLAGS]"
  echo "  --extra-libs=ELIBS       add ELIBS [$ELIBS]"
  echo "  --build-suffix=SUFFIX    suffix for application specific build []"
  echo "  --arch=ARCH              select architecture  [$arch]"
  echo "  --cpu=CPU                selects the minimum cpu required (affects
                                   instruction selection, may crash on older CPUs)"
  echo "  --powerpc-perf-enable    enable performance report on PPC"
  echo "                           (requires enabling PMC)"
  echo "  --disable-mmx            disable MMX usage"
  echo "  --disable-armv5te        disable armv5te usage"
  echo "  --disable-armv6          disable armv6 usage"
  echo "  --disable-iwmmxt         disable iwmmxt usage"
  echo "  --disable-altivec        disable AltiVec usage"
  echo "  --disable-audio-oss      disable OSS audio support [default=no]"
  echo "  --disable-audio-beos     disable BeOS audio support [default=no]"
  echo "  --disable-v4l            disable video4linux grabbing [default=no]"
  echo "  --disable-v4l2           disable video4linux2 grabbing [default=no]"
  echo "  --disable-bktr           disable bktr video grabbing [default=no]"
  echo "  --disable-dv1394         disable DV1394 grabbing [default=no]"
  echo "  --disable-network        disable network support [default=no]"
  echo "  --disable-ipv6           disable ipv6 support [default=no]"
  echo "  --disable-zlib           disable zlib [default=no]"
  echo "  --disable-vhook          disable video hooking support"
  echo "  --enable-gprof           enable profiling with gprof [$gprof]"
  echo "  --disable-debug          disable debugging symbols"
  echo "  --disable-opts           disable compiler optimizations"
  echo "  --enable-extra-warnings  enable more compiler warnings"
  echo "  --disable-mpegaudio-hp   faster (but less accurate)"
  echo "                           MPEG audio decoding [default=no]"
  echo "  --disable-protocols      disable I/O protocols support [default=no]"
  echo "  --disable-ffmpeg         disable ffmpeg build"
  echo "  --disable-ffserver       disable ffserver build"
  echo "  --disable-ffplay         disable ffplay build"
  echo "  --enable-small           optimize for size instead of speed"
  echo "  --enable-memalign-hack   emulate memalign, interferes with memory debuggers"
  echo "  --disable-strip          disable stripping of executables and shared libraries"
  echo "  --disable-encoder=NAME   disables encoder NAME"
  echo "  --enable-encoder=NAME    enables encoder NAME"
  echo "  --disable-decoder=NAME   disables decoder NAME"
  echo "  --enable-decoder=NAME    enables decoder NAME"
  echo "  --disable-encoders       disables all encoders"
  echo "  --disable-decoders       disables all decoders"
  echo "  --disable-muxer=NAME     disables muxer NAME"
  echo "  --enable-muxer=NAME      enables muxer NAME"
  echo "  --disable-muxers         disables all muxers"
  echo "  --disable-demuxer=NAME   disables demuxer NAME"
  echo "  --enable-demuxer=NAME    enables demuxer NAME"
  echo "  --disable-demuxers       disables all demuxers"
  echo "  --enable-parser=NAME     enables parser NAME"
  echo "  --disable-parser=NAME    disables parser NAME"
  echo "  --disable-parsers        disables all parsers"
  echo ""
  echo "NOTE: Object files are built at the place where configure is launched."
  exit 1
}

log(){
    echo "$@" >>$logfile
}

log_file(){
    log BEGIN $1
    cat -n $1 >>$logfile
    log END $1
}

echolog(){
    log "$@"
    echo "$@"
}

die(){
    echolog "$@"
    cat <<EOF
If you think configure made a mistake, make sure you are using the latest
version from SVN.  If the latest version fails, report the problem to the
ffmpeg-devel@mplayerhq.hu mailing list or IRC #ffmpeg on irc.freenode.net.
EOF
    if enabled logging; then
        cat <<EOF
Include the log file "$logfile" produced by configure as this will help
solving the problem.
EOF
    else
cat <<EOF
Rerun configure with logging enabled (do not use --log=no), and include the
log this produces with your report.
EOF
    fi
    rm -f $TMPC $TMPO $TMPE $TMPS $TMPH
    exit 1
}

# "tr '[a-z]' '[A-Z]'" is a workaround for Solaris tr not grokking "tr a-z A-Z"
toupper(){
    echo "$@" | tr '[a-z]' '[A-Z]'
}

set_all(){
    value=$1
    shift
    for var in $*; do
        eval $var=$value
    done
}

pushvar(){
    for var in $*; do
        eval level=\${${var}_level:=0}
        eval ${var}_${level}="\$$var"
        eval ${var}_level=$(($level+1))
    done
}

popvar(){
    for var in $*; do
        eval level=\${${var}_level:-0}
        test $level = 0 && continue
        eval level=$(($level-1))
        eval $var="\${${var}_${level}}"
        eval ${var}_level=$level
        eval unset ${var}_${level}
    done
}

enable(){
    set_all yes $*
}

disable(){
    set_all no $*
}

enabled(){
    eval test "x\$$1" = "xyes"
}

disabled(){
    eval test "x\$$1" = "xno"
}

enabled_all(){
    for opt; do
        enabled $opt || return 1
    done
}

disabled_all(){
    for opt; do
        disabled $opt || return 1
    done
}

enabled_any(){
    for opt; do
        enabled $opt && return 0
    done
}

disabled_any(){
    for opt; do
        disabled $opt && return 0
    done
}

check_deps(){
    for cfg; do
        enabled ${cfg}_checking && die "Circular dependency for $cfg."
        disabled ${cfg}_checking && continue
        enable ${cfg}_checking

        eval dep_all="\$${cfg}_deps"
        eval dep_any="\$${cfg}_deps_any"

        pushvar cfg dep_all dep_any
        check_deps $dep_all $dep_any
        popvar cfg dep_all dep_any

        enabled_all $dep_all || disable $cfg
        enabled_any $dep_any || disable $cfg

        disable ${cfg}_checking
    done
}

print_config(){
    pfx=$1
    header=$2
    makefile=$3
    shift 3
    for cfg; do
        if enabled $cfg; then
            ucname="${pfx}`toupper $cfg`"
            echo "#define ${ucname} 1" >> $header
            echo "${ucname}=yes" >> $makefile
        fi
    done
}

flags_saved(){
    (: ${SAVE_CFLAGS?}) 2>/dev/null
}

save_flags(){
    flags_saved && return
    SAVE_CFLAGS="$CFLAGS"
    SAVE_LDFLAGS="$LDFLAGS"
    SAVE_extralibs="$extralibs"
}

restore_flags(){
    flags_saved || return
    CFLAGS="$SAVE_CFLAGS"
    LDFLAGS="$SAVE_LDFLAGS"
    extralibs="$SAVE_extralibs"
    unset SAVE_CFLAGS
    unset SAVE_LDFLAGS
    unset SAVE_extralibs
}

temp_cflags(){
    save_flags
    CFLAGS="$CFLAGS $*"
}

temp_ldflags(){
    save_flags
    LDFLAGS="$LDFLAGS $*"
}

temp_extralibs(){
    save_flags
    extralibs="$extralibs $*"
}

append(){
    var=$1
    shift
    flags_saved && eval "SAVE_$var=\"\$SAVE_$var $*\""
    eval "$var=\"\$$var $*\""
}

add_cflags(){
    append CFLAGS "$@"
}

add_ldflags(){
    append LDFLAGS "$@"
}

add_extralibs(){
    append extralibs "$@"
}

check_cmd(){
    log "$@"
    "$@" >>$logfile 2>&1
}

check_cc(){
    log check_cc "$@"
    cat >$TMPC
    log_file $TMPC
    check_cmd $cc $CFLAGS "$@" -c -o $TMPO $TMPC
}

check_cpp(){
    log check_cpp "$@"
    cat >$TMPC
    log_file $TMPC
    check_cmd $cc $CFLAGS "$@" -E -o $TMPO $TMPC
}

check_ld(){
    log check_ld "$@"
    check_cc || return
    check_cmd $cc $LDFLAGS "$@" -o $TMPE $TMPO $extralibs
}

check_cflags(){
    log check_cflags "$@"
    check_cc "$@" <<EOF && add_cflags "$@"
int x;
EOF
}

check_ldflags(){
    log check_ldflags "$@"
    check_ld "$@" <<EOF && add_ldflags "$@"
int main(){
    return 0;
}
EOF
}

check_header(){
    log check_header "$@"
    header=$1
    shift
    check_cpp "$@" <<EOF
#include <$header>
int x;
EOF
    err=$?
    var=`echo $header | sed 's/[^A-Za-z0-9_]/_/g'`
    test "$err" = 0 && enable $var || disable $var
    return $err
}

check_func(){
    log check_func "$@"
    func=$1
    shift
    check_ld "$@" <<EOF
extern int $func();
int main(){
    $func();
}
EOF
    err=$?
    test "$err" = 0 && enable $func || disable $func
    return $err
}

check_lib(){
    log check_lib "$@"
    header="$1"
    func="$2"
    shift 2
    temp_extralibs "$@"
    check_header $header && check_func $func && add_extralibs "$@"
    err=$?
    restore_flags
    return $err
}

check_exec(){
    check_ld "$@" && { enabled cross_compile || $TMPE >>$logfile 2>&1; }
}

require(){
    name="$1"
    header="$2"
    func="$3"
    shift 3
    check_lib $header $func "$@" || die "ERROR: $name not found"
}

apply(){
    file=$1
    shift
    "$@" < "$file" > "$file.tmp" && mv "$file.tmp" "$file" || rm "$file.tmp"
}

CONFIG_LIST='
    encoders
    decoders
    parsers
    muxers
    demuxers
    amr
    amr_nb
    amr_nb_fixed
    amr_wb
    audio_beos
    audio_oss
    avisynth
    beos_netserver
    bktr
    dc1394
    dv1394
    ffmpeg
    ffplay
    ffserver
    gpl
    gprof
    ipv6
    liba52bin
    libdts
    libfaac
    libfaad
    libfaadbin
    libgsm
    libmp3lame
    libnut
    libogg
    libtheora
    libvorbis
    memalign_hack
    mpegaudio_hp
    network
    pp
    protocols
    swscaler
    vhook
    video4linux
    video4linux2
    wince
    x11grab
    x264
    xvid
    zlib
'

HAVE_LIST='
    altivec
    altivec_h
    armv5te
    armv6
    beosthreads
    byteswap_h
    cmov
    dcbzl
    dev_bktr_ioctl_bt848_h
    dev_bktr_ioctl_meteor_h
    dev_ic_bt8xx_h
    dev_video_meteor_ioctl_meteor_h
    dev_video_bktr_ioctl_bt848_h
    dlfcn_h
    dlopen
    fast_cmov
    freetype2
    imlib2
    inet_aton
    iwmmxt
    localtime_r
    lrintf
    machine_ioctl_bt848_h
    machine_ioctl_meteor_h
    malloc_h
    memalign
    mlib
    mmi
    mmx
    os2
    os2threads
    pthreads
    sdl
    sdl_video_size
    soundcard_h
    sys_soundcard_h
    threads
    w32threads
'

TARGET_LIST='
    altivec
    armv5te
    armv6
    iwmmxt
    mmi
    mmx
'

CMDLINE_SELECT="
    $CONFIG_LIST
    $TARGET_LIST
    debug
    extra_warnings
    mingw32
    shared
    static
    beosthreads
    os2threads
    pthreads
    w32threads
"

flashsv_decoder_deps="zlib"
flashsv_encoder_deps="zlib"
mpeg_xvmc_decoder_deps="xvmc"
png_decoder_deps="zlib"
png_encoder_deps="zlib"
x264_encoder_deps="x264"
xvid_encoder_deps="xvid"
zmbv_decoder_deps="zlib"
zmbv_encoder_deps="zlib"

aac_decoder_deps="libfaad"
mpeg4aac_decoder_deps="libfaad"
amr_nb_decoder_deps_any="amr_nb amr_nb_fixed"
amr_nb_encoder_deps_any="amr_nb amr_nb_fixed"
amr_wb_decoder_deps="amr_wb"
amr_wb_encoder_deps="amr_wb"
dts_decoder_deps="libdts"
faac_encoder_deps="libfaac"
liba52_decoder_deps="liba52bin"
libgsm_decoder_deps="libgsm"
libgsm_encoder_deps="libgsm"
libtheora_encoder_deps="libtheora"
mp3lame_encoder_deps="libmp3lame"
oggvorbis_decoder_deps="libvorbis"
oggvorbis_encoder_deps="libvorbis"

audio_demuxer_deps_any="audio_oss audio_beos"
audio_muxer_deps_any="audio_oss audio_beos"
dc1394_demuxer_deps="dc1394"
dv1394_demuxer_deps="dv1394"
gxf_muxer_deps="gpl"
libnut_demuxer_deps="libnut"
libnut_muxer_deps="libnut"
ogg_muxer_deps="libogg"
redir_demuxer_deps="network"
rtp_muxer_deps="network"
rtsp_demuxer_deps="network"
sdp_demuxer_deps="network"
v4l2_demuxer_deps="video4linux2"
video_grab_device_demuxer_deps_any="video4linux bktr"
x11_grab_device_demuxer_deps="x11grab"

ffplay_deps="sdl"
ffserver_deps="network protocols muxers"
network_deps="protocols"

# set temporary file name
if test ! -z "$TMPDIR" ; then
    TMPDIR1="${TMPDIR}"
elif test ! -z "$TEMPDIR" ; then
    TMPDIR1="${TEMPDIR}"
else
    TMPDIR1="/tmp"
fi

TMPC="${TMPDIR1}/ffmpeg-conf-${RANDOM}-$$-${RANDOM}.c"
TMPO="${TMPDIR1}/ffmpeg-conf-${RANDOM}-$$-${RANDOM}.o"
TMPE="${TMPDIR1}/ffmpeg-conf-${RANDOM}-$$-${RANDOM}"
TMPS="${TMPDIR1}/ffmpeg-conf-${RANDOM}-$$-${RANDOM}.S"
TMPH="${TMPDIR1}/ffmpeg-conf-${RANDOM}-$$-${RANDOM}.h"

# default parameters

logging="yes"
logfile="config.err"

# installation paths
PREFIX="/usr/local"
libdir='${PREFIX}/lib'
shlibdir="$libdir"
incdir='${PREFIX}/include/ffmpeg'
mandir='${PREFIX}/man'
bindir='${PREFIX}/bin'

# toolchain
cross_prefix=""
cross_compile="no"
cc="gcc"
ar="ar"
ranlib="ranlib"
make="make"
strip="strip"
asmalign_pot="unknown"

# machine
arch=`uname -m`
cpu="generic"
powerpc_perf="no"
mmx="default"
cmov="no"
fast_cmov="no"
armv5te="default"
armv6="default"
iwmmxt="default"
altivec="default"
dcbzl="no"
mmi="default"
bigendian="no"

case "$arch" in
  i386|i486|i586|i686|i86pc|BePC)
    arch="x86_32"
  ;;
  x86_64|amd64)
    arch="x86_32"
    canon_arch="`$cc -dumpmachine | sed -e 's,\([^-]*\)-.*,\1,'`"
    if [ x"$canon_arch" = x"x86_64" -o x"$canon_arch" = x"amd64" ]; then
      if [ -z "`echo $CFLAGS | grep -- -m32`"  ]; then
        arch="x86_64"
      fi
    fi
  ;;
  # armv4l is a subset of armv[567]*l
  arm|armv[4567]*l)
    arch="armv4l"
  ;;
  alpha)
    arch="alpha"
  ;;
  "Power Macintosh"|ppc|ppc64|powerpc)
    arch="powerpc"
  ;;
  mips|mipsel|IP*)
    arch="mips"
  ;;
  sun4u|sparc64)
    arch="sparc64"
  ;;
  sparc)
    arch="sparc"
  ;;
  sh4)
    arch="sh4"
  ;;
  parisc|parisc64)
    arch="parisc"
  ;;
  s390|s390x)
    arch="s390"
  ;;
  m68k)
    arch="m68k"
  ;;
  ia64)
    arch="ia64"
  ;;
  bfin)
    arch="bfin"
  ;;
  *)
    arch="unknown"
  ;;
esac

# OS
beos_netserver="no"
mingw32="no"
os2="no"
wince="no"

# non-library system interfaces
audio_beos="no"
audio_oss="yes"
bktr="yes"
dv1394="yes"
video4linux2="yes"
video4linux="yes"

# libraries
amr_if2="no"
amr_nb="no"
amr_nb_fixed="no"
amr_wb="no"
avisynth="no"
dc1394="no"
dlfcn_h="no"
dlopen="no"
liba52bin="no"
libdts="no"
libfaac="no"
libfaad2="no"
libfaad="no"
libfaadbin="no"
libgsm="no"
libmp3lame="no"
libnut="no"
libogg="no"
libtheora="no"
libvorbis="no"
mlib="no"
x11grab="no"
x264="no"
xvid="no"
zlib="yes"

# configurable options
debug="yes"
dostrip="yes"
extra_warnings="no"
ffmpeg="yes"
ffplay="yes"
ffserver="yes"
gpl="no"
gprof="no"
ipv6="yes"
shared="no"
static="yes"
memalign_hack="no"
mpegaudio_hp="yes"
network="yes"
optimize="yes"
pp="no"
protocols="yes"
swscaler="no"
vhook="default"

# threading
beosthreads="no"
os2threads="no"
pthreads="no"
w32threads="no"
thread_type="no"

# build settings
extralibs="-lm"
SHFLAGS='-shared -Wl,-soname,$@'
VHOOKSHFLAGS='$(SHFLAGS)'
LIBOBJFLAGS=""
FFLDFLAGS=-Wl,--warn-common
LDLATEFLAGS='-Wl,-rpath-link,\$(BUILD_ROOT)/libavcodec -Wl,-rpath-link,\$(BUILD_ROOT)/libavformat -Wl,-rpath-link,\$(BUILD_ROOT)/libavutil'
FFSERVERLDFLAGS=-Wl,-E
LDCONFIG="ldconfig"
LIBPREF="lib"
LIBSUF=".a"
LIB='$(LIBPREF)$(NAME)$(LIBSUF)'
SLIBPREF="lib"
SLIBSUF=".so"
SLIBNAME='$(SLIBPREF)$(NAME)$(SLIBSUF)'
SLIBNAME_WITH_VERSION='$(SLIBNAME).$(LIBVERSION)'
SLIBNAME_WITH_MAJOR='$(SLIBNAME).$(LIBMAJOR)'
EXESUF=""
BUILDSUF=""
LIB_INSTALL_EXTRA_CMD='$(RANLIB) "$(libdir)/$(LIB)"'

# OS specific
targetos=`uname -s`
case $targetos in
  BeOS|Haiku|Zeta)
    PREFIX="$HOME/config"
    # helps building libavcodec
    add_cflags "-DPIC -fomit-frame-pointer"
    # 3 gcc releases known for BeOS, each with ugly bugs
    gcc_version="`$cc -v 2>&1 | grep version | cut -d ' ' -f3-`"
    case "$gcc_version" in
      2.9-beos-991026*|2.9-beos-000224*) echo "R5/GG gcc"
        mmx="no"
        ;;
      *20010315*) echo "BeBits gcc"
        add_cflags "-fno-expensive-optimizations"
        ;;
    esac
    LDCONFIG="echo ignoring ldconfig"
    SHFLAGS=-nostart
    # disable Linux things
    dv1394="no"
    # enable BeOS things
    audio_beos="yes"
    # no need for libm, but the inet stuff
    # Check for BONE
    # XXX: actually should check for NOT net_server
    if (echo $BEINCLUDES|grep 'headers/be/bone' >/dev/null); then
        extralibs="-lbind -lsocket"
    else
        beos_netserver="yes"
        extralibs="-lnet"
    fi ;;
  SunOS)
    dv1394="no"
    FFLDFLAGS=""
    FFSERVERLDFLAGS=""
    SHFLAGS="-shared -Wl,-h,\$@"
    add_extralibs "-lsocket -lnsl"
    ;;
  NetBSD)
    dv1394="no"
    add_extralibs "-lossaudio"
    ;;
  OpenBSD)
    dv1394="no"
    need_memalign="no"
    LIBOBJFLAGS="\$(PIC)"
    LDCONFIG="ldconfig -m \$(shlibdir)"
    SHFLAGS='-shared'
    SLIBNAME='$(SLIBPREF)$(NAME)$(SLIBSUF).$(LIBVERSION)'
    SLIBNAME_WITH_VERSION='$(SLIBNAME)'
    SLIBNAME_WITH_MAJOR='$(SLIBNAME)'
    add_extralibs "-lossaudio"
    ;;
  FreeBSD)
    dv1394="no"
    need_memalign="no"
    add_cflags "-pthread"
    ;;
  GNU/kFreeBSD)
    dv1394="no"
    add_cflags "-pthread"
    ;;
  BSD/OS)
    dv1394="no"
    extralibs="-lpoll -lgnugetopt -lm"
    strip="strip -d"
    ;;
  Darwin)
    cc="cc"
    dv1394="no"
    need_memalign="no"
    SHFLAGS="-dynamiclib -Wl,-single_module -Wl,-install_name,\$(shlibdir)/\$(SLIBNAME),-current_version,\$(SPPVERSION),-compatibility_version,\$(SPPVERSION) -Wl,-read_only_relocs,suppress"
    VHOOKSHFLAGS='-dynamiclib -Wl,-single_module -flat_namespace -undefined suppress -Wl,-install_name,$(shlibdir)/vhook/$@'
    extralibs=""
    strip="strip -x"
    FFLDFLAGS="-Wl,-dynamic,-search_paths_first"
    SLIBSUF=".dylib"
    SLIBNAME_WITH_VERSION='$(SLIBPREF)$(NAME).$(LIBVERSION)$(SLIBSUF)'
    SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(NAME).$(LIBMAJOR)$(SLIBSUF)'
    FFSERVERLDFLAGS=-Wl,-bind_at_load
    ;;
  MINGW32*)
    # Note: the rest of the mingw32 config is done afterwards as mingw32
    # can be forced on the command line for Linux cross compilation.
    mingw32="yes"
    ;;
  CYGWIN*)
    targetos=CYGWIN
    shlibdir="$bindir"
    dv1394="no"
    VHOOKSHFLAGS='-shared -L$(BUILD_ROOT)/libavformat -L$(BUILD_ROOT)/libavcodec -L$(BUILD_ROOT)/libavutil'
    VHOOKLIBS='-lavformat$(BUILDSUF) -lavcodec$(BUILDSUF) -lavutil$(BUILDSUF) $(EXTRALIBS)'
    extralibs=""
    EXESUF=".exe"
    SLIBPREF="cyg"
    SLIBSUF=".dll"
    SLIBNAME_WITH_VERSION='$(SLIBPREF)$(NAME)-$(LIBVERSION)$(SLIBSUF)'
    SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(NAME)-$(LIBMAJOR)$(SLIBSUF)'
    SHFLAGS='-shared -Wl,--out-implib=lib$(NAME).dll.a'
    ;;
  Linux)
    LDLATEFLAGS="-Wl,--as-needed $LDLATEFLAGS"
    ;;
  IRIX*)
    targetos=IRIX
    ranlib="echo ignoring ranlib"
    ;;
  OS/2)
    TMPE=$TMPE".exe"
    ar="emxomfar -p128"
    ranlib="echo ignoring ranlib"
    strip="echo ignoring strip"
    add_cflags "-Zomf"
    FFLDFLAGS="-Zomf -Zstack 16384 -s"
    SHFLAGS="-Zdll -Zomf"
    FFSERVERLDFLAGS=""
    LIBPREF=""
    LIBSUF=".lib"
    SLIBPREF=""
    SLIBSUF=".dll"
    EXESUF=".exe"
    extralibs=""
    pkg_requires=""
    dv1394="no"
    ffserver="no"
    vhook="no"
    os2="yes"
    ;;
  *)
    targetos="${targetos}-UNKNOWN"
    ;;
esac

# find source path
source_path="`dirname \"$0\"`"
source_path_used="yes"
if test -z "$source_path" -o "$source_path" = "." ; then
    source_path="`pwd`"
    source_path_used="no"
else
    source_path="`cd \"$source_path\"; pwd`"
    echo "$source_path" | grep -q '[[:blank:]]' &&
      die "Out of tree builds are impossible with whitespace in source path."
fi

if test x"$1" = x"-h" -o x"$1" = x"--help" ; then
    show_help
fi

FFMPEG_CONFIGURATION="$@"

ENCODER_LIST=`sed -n 's/^[^#]*ENC.*, *\(.*\)).*/\1_encoder/p' "$source_path/libavcodec/allcodecs.c"`
DECODER_LIST=`sed -n 's/^[^#]*DEC.*, *\(.*\)).*/\1_decoder/p' "$source_path/libavcodec/allcodecs.c"`
PARSER_LIST=`sed -n 's/^[^#]*PARSER.*, *\(.*\)).*/\1_parser/p' "$source_path/libavcodec/allcodecs.c"`
MUXER_LIST=`sed -n 's/^[^#]*_MUX.*, *\(.*\)).*/\1_muxer/p' "$source_path/libavformat/allformats.c"`
DEMUXER_LIST=`sed -n 's/^[^#]*DEMUX.*, *\(.*\)).*/\1_demuxer/p' "$source_path/libavformat/allformats.c"`

enable $ENCODER_LIST $DECODER_LIST $PARSER_LIST $MUXER_LIST $DEMUXER_LIST

die_unknown(){
    echo "Unknown option \"$1\"."
    echo "See $0 --help for available options."
    exit 1
}

for opt do
  optval="${opt#*=}"
  case "$opt" in
  --log)
  ;;
  --log=*) logging="$optval"
  ;;
  --prefix=*) PREFIX="$optval"
  ;;
  --libdir=*) libdir="$optval"
  ;;