configure

    enabled ccc && cpuflags="-arch $cpu" || cpuflags="-mcpu=$cpu"

elif enabled bfin; then

    cpuflags="-mcpu=$cpu"

elif enabled mips; then

    cpuflags="-march=$cpu"

elif enabled avr32; then

    case $cpu in
        ap7[02]0[0-2])
            subarch="avr32_ap"
            cpuflags="-mpart=$cpu"
        ;;
        ap)
            subarch="avr32_ap"
            cpuflags="-march=$cpu"
        ;;
        uc3[ab]*)
            subarch="avr32_uc"
            cpuflags="-mcpu=$cpu"
        ;;
        uc)
            subarch="avr32_uc"
            cpuflags="-march=$cpu"
        ;;
    esac

fi

add_cflags $cpuflags
add_asflags $cpuflags

# compiler sanity check
check_exec <<EOF
int main(void){ return 0; }
EOF
if test "$?" != 0; then
    echo "$cc is unable to create an executable file."
    if test -z "$cross_prefix" && ! enabled cross_compile ; then
        echo "If $cc is a cross-compiler, use the --enable-cross-compile option."
        echo "Only do this if you know what cross compiling means."
    fi
    die "C compiler test failed."
fi

add_cppflags -D_ISOC99_SOURCE -D_POSIX_C_SOURCE=200112
check_cflags -std=c99
check_cc -D_FILE_OFFSET_BITS=64 <<EOF && add_cppflags -D_FILE_OFFSET_BITS=64
#include <stdlib.h>
EOF
check_cc -D_LARGEFILE_SOURCE <<EOF && add_cppflags -D_LARGEFILE_SOURCE
#include <stdlib.h>
EOF

check_host_cflags -std=c99

case "$arch" in
    alpha|ia64|mips|parisc|sparc)
        spic=$shared
    ;;
    x86)
        subarch="x86_32"
        check_cc <<EOF && subarch="x86_64"
        int test[(int)sizeof(char*) - 7];
EOF
        if test "$subarch" = "x86_64"; then
            spic=$shared
        fi
    ;;
esac

enable $subarch
enabled spic && enable pic
check_cpp_condition stdlib.h "defined(__PIC__) || defined(__pic__) || defined(PIC)" && enable pic

# OS specific
case $target_os in
    beos|haiku|zeta)
        prefix_default="$HOME/config"
        # 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"
            disable mmx
            ;;
          *20010315*) echo "BeBits gcc"
            add_cflags -fno-expensive-optimizations
            ;;
        esac
        SHFLAGS=-nostart
        # enable BeOS things
        enable audio_beos
        # no need for libm, but the inet stuff
        # Check for BONE
        # XXX: actually should check for NOT net_server
        if echo $BEINCLUDES | grep -q 'headers/be/bone'; then
            network_extralibs="-lbind -lsocket"
        else
            enable beos_netserver
            network_extralibs="-lnet"
        fi ;;
    sunos)
        FFSERVERLDFLAGS=""
        SHFLAGS='-shared -Wl,-h,$$(@F)'
        enabled x86 && SHFLAGS="-mimpure-text $SHFLAGS"
        network_extralibs="-lsocket -lnsl"
        add_cppflags -D__EXTENSIONS__
        nm_opts='-P -g'
        ;;
    netbsd)
        oss_indev_extralibs="-lossaudio"
        oss_outdev_extralibs="-lossaudio"
        ;;
    openbsd)
        enable malloc_aligned
        # On OpenBSD 4.5. the compiler does not use PIC unless
        # explicitly using -fPIC. FFmpeg builds fine without PIC,
        # however the generated executable will not do anything
        # (simply quits with exit-code 1, no crash, no output).
        # Thus explicitly enable PIC here.
        enable pic
        SHFLAGS='-shared'
        oss_indev_extralibs="-lossaudio"
        oss_outdev_extralibs="-lossaudio"
        ;;
    freebsd|dragonfly)
        enable malloc_aligned
        ;;
    bsd/os)
        osextralibs="-lpoll -lgnugetopt"
        strip="strip -d"
        ;;
    darwin)
        enable malloc_aligned
        SHFLAGS='-dynamiclib -Wl,-single_module -Wl,-install_name,$(SHLIBDIR)/$(SLIBNAME),-current_version,$(LIBVERSION),-compatibility_version,$(LIBMAJOR) -Wl,-read_only_relocs,suppress'
        strip="strip -x"
        FFLDFLAGS="-Wl,-dynamic,-search_paths_first"
        SLIBSUF=".dylib"
        SLIBNAME_WITH_VERSION='$(SLIBPREF)$(FULLNAME).$(LIBVERSION)$(SLIBSUF)'
        SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME).$(LIBMAJOR)$(SLIBSUF)'
        FFSERVERLDFLAGS=-Wl,-bind_at_load
        objformat="macho"
        enabled x86_64 && objformat="macho64"
        enabled_any pic shared ||
            { check_cflags -mdynamic-no-pic && add_asflags -mdynamic-no-pic; }
        ;;
    mingw32*)
        if test $target_os = "mingw32ce"; then
            disable network
        else
            target_os=mingw32
        fi
        LIBTARGET=i386
        if enabled x86_64; then
            enable malloc_aligned
            LIBTARGET=x64
        elif enabled arm; then
            LIBTARGET=arm
        fi
        shlibdir_default="$bindir_default"
        disable ffserver
        SLIBPREF=""
        SLIBSUF=".dll"
        SLIBNAME_WITH_VERSION='$(SLIBPREF)$(FULLNAME)-$(LIBVERSION)$(SLIBSUF)'
        SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
        SLIB_EXTRA_CMD='-lib.exe /machine:$(LIBTARGET) /def:$$(@:$(SLIBSUF)=.def) /out:$(SUBDIR)$(SLIBNAME_WITH_MAJOR:$(SLIBSUF)=.lib)'
        SLIB_INSTALL_EXTRA_CMD='-install -m 644 $(SUBDIR)$(SLIBNAME_WITH_MAJOR:$(SLIBSUF)=.lib) "$(SHLIBDIR)/$(SLIBNAME:$(SLIBSUF)=.lib)"; \
            install -m 644 $(SUBDIR)$(SLIBNAME_WITH_MAJOR:$(SLIBSUF)=.lib) "$(SHLIBDIR)/$(SLIBNAME_WITH_MAJOR:$(SLIBSUF)=.lib)"; \
            install -d "$(LIBDIR)"; \
            install -m 644 $(SUBDIR)lib$(SLIBNAME:$(SLIBSUF)=.dll.a) "$(LIBDIR)/lib$(SLIBNAME:$(SLIBSUF)=.dll.a)"'
        SLIB_UNINSTALL_EXTRA_CMD='rm -f "$(SHLIBDIR)/$(SLIBNAME:$(SLIBSUF)=.lib)"'
        SHFLAGS='-shared -Wl,--output-def,$$(@:$(SLIBSUF)=.def) -Wl,--out-implib,$(SUBDIR)lib$(SLIBNAME:$(SLIBSUF)=.dll.a) -Wl,--enable-runtime-pseudo-reloc -Wl,--enable-auto-image-base'
        objformat="win32"
        enable dos_paths
        check_cflags -fno-common
        if ! enabled x86_64; then
            check_cpp_condition _mingw.h "(__MINGW32_MAJOR_VERSION > 3) || (__MINGW32_MAJOR_VERSION == 3 && __MINGW32_MINOR_VERSION >= 15)" ||
                die "ERROR: MinGW runtime version must be >= 3.15."
            enabled_any avisynth vfwcap_indev &&
                { check_cpp_condition w32api.h "(__W32API_MAJOR_VERSION > 3) || (__W32API_MAJOR_VERSION == 3 && __W32API_MINOR_VERSION >= 13)" ||
                  die "ERROR: avisynth and vfwcap_indev require w32api version 3.13 or later."; }
        fi
        ;;
    cygwin*)
        target_os=cygwin
        shlibdir_default="$bindir_default"
        SLIBPREF="cyg"
        SLIBSUF=".dll"
        SLIBNAME_WITH_VERSION='$(SLIBPREF)$(FULLNAME)-$(LIBVERSION)$(SLIBSUF)'
        SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
        SHFLAGS='-shared -Wl,--enable-auto-image-base'
        objformat="win32"
        enable dos_paths
        check_cflags -fno-common
        ;;
    *-dos|freedos|opendos)
        disable ffplay ffserver
        disable $INDEV_LIST $OUTDEV_LIST
        network_extralibs="-lsocket"
        objformat="coff"
        enable dos_paths
        ;;
    linux)
        enable dv1394
        ;;
    irix*)
        target_os=irix
        ranlib="echo ignoring ranlib"
        ;;
    os/2*)
        strip="lxlite"
        ln_s="cp -f"
        FFLDFLAGS="-Zomf -Zbin-files -Zargs-wild -Zmap"
        SHFLAGS='$(SUBDIR)$(NAME).def -Zdll -Zomf'
        FFSERVERLDFLAGS=""
        LIBSUF="_s.a"
        SLIBPREF=""
        SLIBSUF=".dll"
        SLIBNAME_WITH_VERSION='$(SLIBPREF)$(NAME)-$(LIBVERSION)$(SLIBSUF)'
        SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(shell echo $(NAME) | cut -c1-6)$(LIBMAJOR)$(SLIBSUF)'
        SLIB_CREATE_DEF_CMD='echo LIBRARY $(SLIBNAME_WITH_MAJOR) INITINSTANCE TERMINSTANCE > $(SUBDIR)$(NAME).def; \
          echo PROTMODE >> $(SUBDIR)$(NAME).def; \
          echo CODE PRELOAD MOVEABLE DISCARDABLE >> $(SUBDIR)$(NAME).def; \
          echo DATA PRELOAD MOVEABLE MULTIPLE NONSHARED >> $(SUBDIR)$(NAME).def; \
          echo EXPORTS >> $(SUBDIR)$(NAME).def; \
          emxexp -o $(OBJS) >> $(SUBDIR)$(NAME).def'
        SLIB_EXTRA_CMD='emximp -o $(SUBDIR)$(LIBPREF)$(NAME)_dll.a $(SUBDIR)$(NAME).def; \
          emximp -o $(SUBDIR)$(LIBPREF)$(NAME)_dll.lib $(SUBDIR)$(NAME).def;'
        SLIB_INSTALL_EXTRA_CMD='install -m 644 $(SUBDIR)$(LIBPREF)$(NAME)_dll.a $(SUBDIR)$(LIBPREF)$(NAME)_dll.lib "$(LIBDIR)"'
        SLIB_UNINSTALL_EXTRA_CMD='rm -f "$(LIBDIR)"/$(LIBPREF)$(NAME)_dll.a "$(LIBDIR)"/$(LIBPREF)$(NAME)_dll.lib'
        enable dos_paths
        ;;
    gnu/kfreebsd)
        ;;
    gnu)
        ;;
    none)
        ;;
    *)
        die "Unknown OS '$target_os'."
        ;;
esac

set_default $PATHS_LIST

add_extralibs $osextralibs

# Combine FFLDFLAGS and the LDFLAGS environment variable.
LDFLAGS="$FFLDFLAGS $LDFLAGS"

# we need to build at least one lib type
if ! enabled_any static shared; then
    cat <<EOF
At least one library type must be built.
Specify --enable-static to build the static libraries or --enable-shared to
build the shared libraries as well. To only build the shared libraries specify
--disable-static in addition to --enable-shared.
EOF
    exit 1;
fi

disabled static && LIBNAME=""

if enabled_any libfaad libfaadbin ; then
    if check_header faad.h; then
        check_cc <<EOF
#include <faad.h>
#ifndef FAAD2_VERSION
ok faad1
#endif
int main(void) { return 0; }
EOF
        test $? = 0 && enable libfaad2
    else
        die "FAAD test failed."
    fi
fi


die_license_disabled() {
    enabled $1 || { enabled $2 && die "$2 is $1 and --enable-$1 is not specified."; }
}

die_license_disabled gpl libfaad2
die_license_disabled gpl libx264
die_license_disabled gpl libxvid
die_license_disabled gpl postproc
die_license_disabled gpl x11grab

die_license_disabled nonfree libfaac

die_license_disabled version3 libopencore_amrnb
die_license_disabled version3 libopencore_amrwb

enabled version3 && { enabled gpl && enable gplv3 || enable lgplv3; }

check_deps $ARCH_EXT_LIST

disabled optimizations || check_cflags -fomit-frame-pointer

enable_pic() {
    enable pic
    add_cppflags -DPIC
    add_cflags   -fPIC
    add_asflags  -fPIC
}

enabled pic && enable_pic

check_cc <<EOF || die "Symbol mangling check failed."
int ff_extern;
EOF
sym=$($nm $nm_opts $TMPO | awk '/ff_extern/{ print substr($0, match($0, /[^ \t]*ff_extern/)) }')
extern_prefix=${sym%%ff_extern*}

check_cc <<EOF && enable inline_asm
void foo(void) { __asm__ volatile ("" ::); }
EOF

_restrict=
for restrict_keyword in restrict __restrict__ __restrict; do
    check_cc <<EOF && _restrict=$restrict_keyword && break
void foo(char * $restrict_keyword p);
EOF
done

check_cc <<EOF && enable attribute_packed
struct { int x; } __attribute__((packed)) x;
EOF

check_cc <<EOF && enable attribute_may_alias
union { int x; } __attribute__((may_alias)) x;
EOF

check_cc <<EOF || die "endian test failed"
unsigned int endian = 'B' << 24 | 'I' << 16 | 'G' << 8 | 'E';
EOF
od -t x1 $TMPO | grep -q '42 *49 *47 *45' && enable bigendian

if enabled alpha; then

    check_cflags -mieee

elif enabled arm; then

    check_cflags -marm

    check_ld <<EOF && enable vfp_args
__asm__ (".eabi_attribute 28, 1");
int main(void) { return 0; }
EOF

    # We have to check if pld is a nop and disable it.
    check_asm pld '"pld [r0]"'

    enabled armv5te && check_asm armv5te '"qadd r0, r0, r0"'
    enabled armv6   && check_asm armv6   '"sadd16 r0, r0, r0"'
    enabled armv6t2 && check_asm armv6t2 '"movt r0, #0"'
    enabled armvfp  && check_asm armvfp  '"fadds s0, s0, s0"'
    enabled iwmmxt  && check_asm iwmmxt  '"wunpckelub wr6, wr4"'
    enabled neon    && check_asm neon    '"vadd.i16 q0, q0, q0"'

    enabled_all armv6t2 shared !pic && enable_pic

elif enabled ia64; then

    # HACK: currently fails to build if .bss is > 4MB and shared libs are built
    enabled shared && enable_weak hardcoded_tables

elif enabled mips; then

    check_asm loongson '"dmult.g $1, $2, $3"'
    enabled mmi     && check_asm mmi     '"lq $2, 0($2)"'

elif enabled ppc; then

    check_asm dcbzl     '"dcbzl 0, 1"'
    check_asm ppc4xx    '"maclhw r10, r11, r12"'
    check_asm xform_asm '"lwzx %1, %y0" :: "Z"(*(int*)0), "r"(0)'

    # AltiVec flags: The FSF version of GCC differs from the Apple version
    if enabled altivec; then
        check_cflags -maltivec -mabi=altivec &&
        { check_header altivec.h && inc_altivec_h="#include <altivec.h>" ; } ||
        check_cflags -faltivec

        # check if our compiler supports Motorola AltiVec C API
        check_cc <<EOF || disable altivec
$inc_altivec_h
int main(void) {
    vector signed int v1, v2, v3;
    v1 = vec_add(v2,v3);
    return 0;
}
EOF

        # check if our compiler supports braces for vector declarations
        check_cc <<EOF || die "You need a compiler that supports {} in AltiVec vector declarations."
$inc_altivec_h
int main (void) { (vector int) {1}; return 0; }
EOF
    fi

elif enabled sparc; then

    enabled vis && check_asm vis '"pdist %f0, %f0, %f0"' -mcpu=ultrasparc &&
        add_cflags -mcpu=ultrasparc -mtune=ultrasparc

elif enabled x86; then

    # check whether EBP is available on x86
    # As 'i' is stored on the stack, this program will crash
    # if the base pointer is used to access it because the
    # base pointer is cleared in the inline assembly code.
    check_exec_crash <<EOF && enable ebp_available
    volatile int i=0;
    __asm__ volatile (
        "xorl %%ebp, %%ebp"
    ::: "%ebp");
    return i;
EOF

    # check whether EBX is available on x86
    check_asm ebx_available '""::"b"(0)' &&
        check_asm ebx_available '"":::"%ebx"'

    # check whether more than 10 operands are supported
    check_cc <<EOF && enable ten_operands
int main(void) {
    int x=0;
    __asm__ volatile(
        ""
        :"+&rm"(x), "+&rm"(x), "+&rm"(x), "+&rm"(x), "+&rm"(x), "+&rm"(x)
    );
    return 0;
}
EOF

    # check whether binutils is new enough to compile SSSE3/MMX2
    enabled ssse3 && check_asm ssse3 '"pabsw %xmm0, %xmm0"'
    enabled mmx2  && check_asm mmx2  '"pmaxub %mm0, %mm1"'

    check_asm bswap '"bswap %%eax" ::: "%eax"'

    YASMFLAGS="-f $objformat -DARCH_$(toupper $subarch)"
    enabled     x86_64        && append YASMFLAGS "-m amd64"
    enabled     pic           && append YASMFLAGS "-DPIC"
    test -n "$extern_prefix"  && append YASMFLAGS "-DPREFIX"
    case "$objformat" in
        elf) enabled debug && append YASMFLAGS "-g dwarf2" ;;
    esac
    disabled yasm || { check_yasm "pabsw xmm0, xmm0" && enable yasm; }

    case "$cpu" in
        athlon*|opteron*|k8*|pentium|pentium-mmx|prescott|nocona|atom|geode)
            disable fast_clz
        ;;
    esac

fi

if check_func dlopen; then
    ldl=
elif check_func dlopen -ldl; then
    ldl=-ldl
fi

# Solaris has nanosleep in -lrt, OpenSolaris no longer needs that
check_func nanosleep || { check_func nanosleep -lrt && add_extralibs -lrt; }

check_func  fork
check_func  getaddrinfo $network_extralibs
check_func  gethrtime
check_func  getrusage
check_func  inet_aton $network_extralibs
check_func  isatty
check_func  ${malloc_prefix}memalign            && enable memalign
check_func  mkstemp
check_func  ${malloc_prefix}posix_memalign      && enable posix_memalign
check_func  setrlimit
check_func_headers io.h setmode
check_func_headers lzo/lzo1x.h lzo1x_999_compress
check_func_headers windows.h GetProcessTimes
check_func_headers windows.h VirtualAlloc

check_header conio.h
check_header dlfcn.h
check_header dxva2api.h
check_header malloc.h
check_header poll.h
check_header sys/mman.h
check_header sys/resource.h
check_header sys/select.h
check_header termios.h
check_header vdpau/vdpau.h
check_header vdpau/vdpau_x11.h
check_header X11/extensions/XvMClib.h

check_struct dxva2api.h DXVA_PictureParameters wDecodedPictureIndex

if ! enabled_any memalign memalign_hack posix_memalign malloc_aligned &&
     enabled_any $need_memalign ; then
    die "Error, no aligned memory allocator but SSE enabled, disable it or use --enable-memalign-hack."
fi

disabled  zlib || check_lib   zlib.h      zlibVersion -lz   || disable  zlib
disabled bzlib || check_lib2 bzlib.h BZ2_bzlibVersion -lbz2 || disable bzlib

# check for some common methods of building with pthread support
# do this before the optional library checks as some of them require pthreads
if enabled pthreads; then
    if check_func pthread_create; then
        :
    elif check_func pthread_create -pthread; then
        add_cflags -pthread
        add_extralibs -pthread
    elif check_func pthread_create -pthreads; then
        add_cflags -pthreads
        add_extralibs -pthreads
    elif check_func pthread_create -lpthreadGC2; then
        add_extralibs -lpthreadGC2
    elif ! check_lib pthread.h pthread_create -lpthread; then
        die "ERROR: can't find pthreads library"
    fi
fi

for thread in $THREADS_LIST; do
    if enabled $thread; then
        test -n "$thread_type" &&
            die "ERROR: Only one thread type must be selected." ||
            thread_type="$thread"
    fi
done

check_lib math.h sin -lm
check_lib va/va.h vaInitialize -lva

check_mathfunc exp2
check_mathfunc exp2f
check_mathfunc llrint
check_mathfunc log2
check_mathfunc log2f
check_mathfunc lrint
check_mathfunc lrintf
check_mathfunc round
check_mathfunc roundf
check_mathfunc truncf

# these are off by default, so fail if requested and not available
enabled avisynth   && require2 vfw32 "windows.h vfw.h" AVIFileInit -lavifil32
enabled libdirac   && add_cflags $(pkg-config --cflags dirac) &&
                      require  libdirac libdirac_decoder/dirac_parser.h dirac_decoder_init $(pkg-config --libs dirac) &&
                      require  libdirac libdirac_encoder/dirac_encoder.h dirac_encoder_init $(pkg-config --libs dirac)
enabled libfaac    && require2 libfaac "stdint.h faac.h" faacEncGetVersion -lfaac
enabled libfaad    && require2 libfaad faad.h faacDecOpen -lfaad
enabled libgsm     && require  libgsm gsm/gsm.h gsm_create -lgsm
enabled libmp3lame && require  libmp3lame lame/lame.h lame_init -lmp3lame -lm
enabled libnut     && require  libnut libnut.h nut_demuxer_init -lnut
enabled libopencore_amrnb  && require libopencore_amrnb opencore-amrnb/interf_dec.h Decoder_Interface_init -lopencore-amrnb -lm
enabled libopencore_amrwb  && require libopencore_amrwb opencore-amrwb/dec_if.h D_IF_init -lopencore-amrwb -lm
enabled libopenjpeg && require libopenjpeg openjpeg.h opj_version -lopenjpeg
enabled libschroedinger && add_cflags $(pkg-config --cflags schroedinger-1.0) &&
                           require libschroedinger schroedinger/schro.h schro_init $(pkg-config --libs schroedinger-1.0)
enabled libspeex   && require  libspeex speex/speex.h speex_decoder_init -lspeex
enabled libtheora  && require  libtheora theora/theoraenc.h th_info_init -ltheoraenc -ltheoradec -logg
enabled libvorbis  && require  libvorbis vorbis/vorbisenc.h vorbis_info_init -lvorbisenc -lvorbis -logg
enabled libx264    && require  libx264 x264.h x264_encoder_encode -lx264 -lm &&
                      { check_cpp_condition x264.h "X264_BUILD >= 83" ||
                        die "ERROR: libx264 version must be >= 0.83."; }
enabled libxvid    && require  libxvid xvid.h xvid_global -lxvidcore
enabled mlib       && require  mediaLib mlib_types.h mlib_VectorSub_S16_U8_Mod -lmlib

# libdc1394 check
if enabled libdc1394; then
    { check_lib dc1394/dc1394.h dc1394_new -ldc1394 -lraw1394 &&
        enable libdc1394_2; } ||
    { check_lib libdc1394/dc1394_control.h dc1394_create_handle -ldc1394_control -lraw1394 &&
        enable libdc1394_1; } ||
    die "ERROR: No version of libdc1394 found "
fi

SDL_CONFIG="${cross_prefix}sdl-config"
if "${SDL_CONFIG}" --version > /dev/null 2>&1; then
    sdl_cflags=$("${SDL_CONFIG}" --cflags)
    sdl_libs=$("${SDL_CONFIG}" --libs)
    check_func_headers SDL.h SDL_Init $sdl_cflags $sdl_libs &&
    check_cpp_condition SDL.h "(SDL_MAJOR_VERSION<<16 | SDL_MINOR_VERSION<<8 | SDL_PATCHLEVEL) >= 0x010201" $sdl_cflags &&
    enable sdl &&
    check_struct SDL.h SDL_VideoInfo current_w $sdl_cflags && enable sdl_video_size
fi

texi2html -version > /dev/null 2>&1 && enable texi2html || disable texi2html

if enabled network; then
    check_type "sys/types.h sys/socket.h" socklen_t
    check_type netdb.h "struct addrinfo"
    check_type netinet/in.h "struct ipv6_mreq"
    check_type netinet/in.h "struct sockaddr_in6"
    check_type "sys/types.h sys/socket.h" "struct sockaddr_storage"
    check_struct "sys/types.h sys/socket.h" "struct sockaddr" sa_len
    # Prefer arpa/inet.h over winsock2
    if check_header arpa/inet.h ; then
        check_func closesocket
    elif check_header winsock2.h ; then
        check_func_headers winsock2.h closesocket -lws2 && \
            network_extralibs="-lws2" || \
        { check_func_headers winsock2.h closesocket -lws2_32 && \
            network_extralibs="-lws2_32"; }
        check_type ws2tcpip.h socklen_t
        check_type ws2tcpip.h "struct addrinfo"
        check_type ws2tcpip.h "struct ipv6_mreq"
        check_type ws2tcpip.h "struct sockaddr_in6"
        check_type ws2tcpip.h "struct sockaddr_storage"
        check_struct winsock2.h "struct sockaddr" sa_len
    else
        disable network
    fi
fi

check_header linux/videodev.h
check_header linux/videodev2.h
check_header sys/videoio.h

check_func_headers "windows.h vfw.h" capCreateCaptureWindow "$vfwcap_indev_extralibs"

# check for ioctl_meteor.h, ioctl_bt848.h and alternatives
{ check_header dev/bktr/ioctl_meteor.h &&
  check_header dev/bktr/ioctl_bt848.h; } ||
{ check_header machine/ioctl_meteor.h &&
  check_header machine/ioctl_bt848.h; } ||
{ check_header dev/video/meteor/ioctl_meteor.h &&
  check_header dev/video/bktr/ioctl_bt848.h; } ||
check_header dev/ic/bt8xx.h

check_header sys/soundcard.h
check_header soundcard.h

enabled_any alsa_indev alsa_outdev && check_lib2 alsa/asoundlib.h snd_pcm_htimestamp -lasound

enabled jack_indev && check_lib2 jack/jack.h jack_client_open -ljack

enabled x11grab                         &&
check_header X11/Xlib.h                 &&
check_header X11/extensions/XShm.h      &&
check_header X11/extensions/Xfixes.h    &&
check_func XOpenDisplay -lX11           &&
check_func XShmCreateImage -lX11 -lXext &&
check_func XFixesGetCursorImage -lX11 -lXext -lXfixes

if ! disabled vdpau && enabled vdpau_vdpau_h; then
check_cpp_condition \
    vdpau/vdpau.h "defined VDP_DECODER_PROFILE_MPEG4_PART2_ASP" ||
    { echolog "Please upgrade to libvdpau >= 0.2 if you would like vdpau support." &&
      disable vdpau; }
fi

enabled debug && add_cflags -g"$debuglevel" && add_asflags -g"$debuglevel"

# add some useful compiler flags if supported
check_cflags -Wdeclaration-after-statement
check_cflags -Wall
check_cflags -Wno-switch
check_cflags -Wdisabled-optimization
check_cflags -Wpointer-arith
check_cflags -Wredundant-decls
check_cflags -Wno-pointer-sign
check_cflags -Wcast-qual
check_cflags -Wwrite-strings
check_cflags -Wtype-limits
check_cflags -Wundef
enabled extra_warnings && check_cflags -Winline

# add some linker flags
check_ldflags -Wl,--warn-common
check_ldflags -Wl,--as-needed
check_ldflags '-Wl,-rpath-link,\$(BUILD_ROOT)/libpostproc -Wl,-rpath-link,\$(BUILD_ROOT)/libswscale -Wl,-rpath-link,\$(BUILD_ROOT)/libavfilter -Wl,-rpath-link,\$(BUILD_ROOT)/libavdevice -Wl,-rpath-link,\$(BUILD_ROOT)/libavformat -Wl,-rpath-link,\$(BUILD_ROOT)/libavcodec -Wl,-rpath-link,\$(BUILD_ROOT)/libavutil'
check_ldflags -Wl,-Bsymbolic

echo "X{};" > $TMPV
test_ldflags -Wl,--version-script,$TMPV &&
    append SHFLAGS '-Wl,--version-script,\$(SUBDIR)lib\$(NAME).ver'

if enabled small; then
    add_cflags $size_cflags
    optimizations="small"
elif enabled optimizations; then
    add_cflags $speed_cflags
fi
check_cflags -fno-math-errno
check_cflags -fno-signed-zeros

if enabled icc; then
    # Just warnings, no remarks
    check_cflags -w1
    # -wd: Disable following warnings
    # 144, 167, 556: -Wno-pointer-sign
    # 10006: ignoring unknown option -fno-signed-zeros
    # 10156: ignoring option '-W'; no argument required
    check_cflags -wd144,167,556,10006,10156
    # 11030: Warning unknown option --as-needed
    # 10156: ignoring option '-export'; no argument required
    check_ldflags -wd10156,11030
    # Allow to compile with optimizations
    check_ldflags -march=$cpu
    # icc 11.0 and 11.1 work with ebp_available, but don't pass the test
    enable ebp_available
elif enabled ccc; then
    # disable some annoying warnings
    add_cflags -msg_disable cvtu32to64
    add_cflags -msg_disable embedcomment
    add_cflags -msg_disable needconstext
    add_cflags -msg_disable nomainieee
    add_cflags -msg_disable ptrmismatch1
    add_cflags -msg_disable unreachcode
elif enabled gcc; then
    check_cflags -fno-tree-vectorize
elif enabled clang; then
    check_cflags -Qunused-arguments
elif enabled armcc; then
    # 2523: use of inline assembler is deprecated
    add_cflags -Wrvct,--diag_suppress=2523
elif enabled tms470; then
    add_cflags -pds=824 -pds=837
fi

if enabled gprof; then
    add_cflags  -p
    add_ldflags -p
fi

# Find out if the .align argument is a power of two or not.
check_asm asmalign_pot '".align 3"'

enabled_any $DECODER_LIST      && enable decoders
enabled_any $ENCODER_LIST      && enable encoders
enabled_any $HWACCEL_LIST      && enable hwaccels
enabled_any $BSF_LIST          && enable bsfs
enabled_any $DEMUXER_LIST      && enable demuxers
enabled_any $MUXER_LIST        && enable muxers
enabled_any $FILTER_LIST       && enable filters
enabled_any $INDEV_LIST        && enable indevs
enabled_any $OUTDEV_LIST       && enable outdevs
enabled_any $PROTOCOL_LIST     && enable protocols

enabled_any $THREADS_LIST      && enable threads

check_deps $CONFIG_LIST       \
           $CONFIG_EXTRA      \
           $HAVE_LIST         \
           $DECODER_LIST      \
           $ENCODER_LIST      \
           $HWACCEL_LIST      \
           $PARSER_LIST       \
           $BSF_LIST          \
           $DEMUXER_LIST      \
           $MUXER_LIST        \
           $FILTER_LIST       \
           $INDEV_LIST        \
           $OUTDEV_LIST       \
           $PROTOCOL_LIST     \

enabled asm || disable $ARCH_LIST $ARCH_EXT_LIST

echo "install prefix            $prefix"
echo "source path               $source_path"
echo "C compiler                $cc"
echo ".align is power-of-two    $asmalign_pot"
echo "ARCH                      $arch ($cpu)"
if test "$build_suffix" != ""; then
    echo "build suffix              $build_suffix"
fi
if test "$extra_version" != ""; then
    echo "version string suffix     $extra_version"
fi
echo "big-endian                ${bigendian-no}"
echo "runtime cpu detection     ${runtime_cpudetect-no}"
if enabled x86; then
    echo "yasm                      ${yasm-no}"
    echo "MMX enabled               ${mmx-no}"
    echo "MMX2 enabled              ${mmx2-no}"
    echo "3DNow! enabled            ${amd3dnow-no}"
    echo "3DNow! extended enabled   ${amd3dnowext-no}"
    echo "SSE enabled               ${sse-no}"
    echo "SSSE3 enabled             ${ssse3-no}"
    echo "CMOV enabled              ${cmov-no}"
    echo "CMOV is fast              ${fast_cmov-no}"
    echo "EBX available             ${ebx_available-no}"
    echo "EBP available             ${ebp_available-no}"
    echo "10 operands supported     ${ten_operands-no}"
fi
if enabled arm; then
    echo "ARMv5TE enabled           ${armv5te-no}"
    echo "ARMv6 enabled             ${armv6-no}"
    echo "ARMv6T2 enabled           ${armv6t2-no}"
    echo "ARM VFP enabled           ${armvfp-no}"
    echo "IWMMXT enabled            ${iwmmxt-no}"
    echo "NEON enabled              ${neon-no}"
fi
if enabled mips; then
    echo "MMI enabled               ${mmi-no}"
fi
if enabled ppc; then
    echo "AltiVec enabled           ${altivec-no}"
    echo "PPC 4xx optimizations     ${ppc4xx-no}"
    echo "dcbzl available           ${dcbzl-no}"
    echo "performance report        ${powerpc_perf-no}"
fi
if enabled sparc; then
    echo "VIS enabled               ${vis-no}"
fi
echo "gprof enabled             ${gprof-no}"
echo "debug symbols             ${debug-no}"
echo "strip symbols             ${stripping-no}"
echo "optimizations             ${optimizations-no}"
echo "static                    ${static-no}"
echo "shared                    ${shared-no}"
echo "postprocessing support    ${postproc-no}"
echo "new filter support        ${avfilter-no}"
echo "filters using lavformat   ${avfilter_lavf-no}"
echo "network support           ${network-no}"
echo "threading support         ${thread_type-no}"
echo "SDL support               ${sdl-no}"
echo "Sun medialib support      ${mlib-no}"
echo "AVISynth enabled          ${avisynth-no}"
echo "libdc1394 support         ${libdc1394-no}"
echo "libdirac enabled          ${libdirac-no}"
echo "libfaac enabled           ${libfaac-no}"
echo "libfaad enabled           ${libfaad-no}"
echo "libfaad dlopened          ${libfaadbin-no}"
echo "libgsm enabled            ${libgsm-no}"
echo "libmp3lame enabled        ${libmp3lame-no}"
echo "libnut enabled            ${libnut-no}"
echo "libopencore-amrnb support ${libopencore_amrnb-no}"
echo "libopencore-amrwb support ${libopencore_amrwb-no}"
echo "libopenjpeg enabled       ${libopenjpeg-no}"
echo "libschroedinger enabled   ${libschroedinger-no}"
echo "libspeex enabled          ${libspeex-no}"
echo "libtheora enabled         ${libtheora-no}"
echo "libvorbis enabled         ${libvorbis-no}"
echo "libx264 enabled           ${libx264-no}"
echo "libxvid enabled           ${libxvid-no}"
echo "zlib enabled              ${zlib-no}"
echo "bzlib enabled             ${bzlib-no}"
echo

for type in decoder encoder hwaccel parser demuxer muxer protocol filter bsf indev outdev; do
    echo "Enabled ${type}s:"
    eval list=\$$(toupper $type)_LIST
    for part in $list; do
        enabled $part && echo ${part%_*}
    done | sort | pr -3 -t
    echo
done

license="LGPL version 2.1 or later"
if enabled nonfree; then
    license="nonfree and unredistributable"
elif enabled gplv3; then
    license="GPL version 3 or later"
elif enabled lgplv3; then
    license="LGPL version 3 or later"
elif enabled gpl; then
    license="GPL version 2 or later"
fi

echo "License: $license"

echo "Creating config.mak and config.h..."

# build tree in object directory if source path is different from current one
if enabled source_path_used; then
    DIRS="
        doc
        libavcodec
        libavcodec/$arch
        libavdevice
        libavfilter
        libavformat
        libavutil
        libavutil/$arch
        libpostproc
        libswscale
        libswscale/$arch
        tests
        tools
    "
    FILES="
        Makefile
        common.mak
        subdir.mak
        doc/texi2pod.pl
        libavcodec/Makefile
        libavdevice/Makefile
        libavfilter/Makefile
        libavformat/Makefile
        libavutil/Makefile
        libpostproc/Makefile
        libswscale/Makefile
    "
    for dir in $DIRS ; do
        mkdir -p $dir
    done
    for f in $FILES ; do
        $ln_s "$source_path/$f" $f
    done
fi

enabled stripping || strip="echo skipping strip"

cat > config.mak <<EOF
# Automatically generated by configure - do not modify!
ifndef FFMPEG_CONFIG_MAK
FFMPEG_CONFIG_MAK=1
FFMPEG_CONFIGURATION=$FFMPEG_CONFIGURATION
prefix=$prefix
LIBDIR=\$(DESTDIR)$libdir
SHLIBDIR=\$(DESTDIR)$shlibdir
INCDIR=\$(DESTDIR)$incdir
BINDIR=\$(DESTDIR)$bindir
DATADIR=\$(DESTDIR)$datadir
MANDIR=\$(DESTDIR)$mandir
SRC_PATH="$source_path"
SRC_PATH_BARE=$source_path
BUILD_ROOT="$PWD"
ARCH=$arch
CC=$cc
AS=$as
LD=$ld
DEPCC=$dep_cc
YASM=$yasmexe
AR=$ar
RANLIB=$ranlib
LN_S=$ln_s
STRIP=$strip
CPPFLAGS=$CPPFLAGS
CFLAGS=$CFLAGS
ASFLAGS=$ASFLAGS
CC_O=$CC_O
LDFLAGS=$LDFLAGS
FFSERVERLDFLAGS=$FFSERVERLDFLAGS
SHFLAGS=$SHFLAGS
YASMFLAGS=$YASMFLAGS
BUILDSUF=$build_suffix
FULLNAME=$FULLNAME
LIBPREF=$LIBPREF
LIBSUF=$LIBSUF
LIBNAME=$LIBNAME
SLIBPREF=$SLIBPREF
SLIBSUF=$SLIBSUF
EXESUF=$EXESUF
EXTRA_VERSION=$extra_version
DEPFLAGS=$DEPFLAGS
CCDEP=$CCDEP
ASDEP=$ASDEP
CC_DEPFLAGS=$CC_DEPFLAGS
AS_DEPFLAGS=$AS_DEPFLAGS
HOSTCC=$host_cc
HOSTCFLAGS=$host_cflags
HOSTEXESUF=$HOSTEXESUF
HOSTLDFLAGS=$host_ldflags
HOSTLIBS=$host_libs
TARGET_EXEC=$target_exec
TARGET_PATH=$target_path
SDL_LIBS=$sdl_libs
SDL_CFLAGS=$sdl_cflags
LIB_INSTALL_EXTRA_CMD=$LIB_INSTALL_EXTRA_CMD
EXTRALIBS=$extralibs
EOF

get_version(){
    name=$1
    file=$source_path/$2
    eval $(grep "#define ${name}_VERSION_M" "$file" | awk '{ print $2"="$3 }')
    eval ${name}_VERSION=\$${name}_VERSION_MAJOR.\$${name}_VERSION_MINOR.\$${name}_VERSION_MICRO
    lcname=$(tolower $name)
    eval echo "${lcname}_VERSION=\$${name}_VERSION" >> config.mak
    eval echo "${lcname}_VERSION_MAJOR=\$${name}_VERSION_MAJOR" >> config.mak
}

get_version LIBSWSCALE  libswscale/swscale.h
get_version LIBPOSTPROC libpostproc/postprocess.h
get_version LIBAVCODEC  libavcodec/avcodec.h
get_version LIBAVDEVICE libavdevice/avdevice.h
get_version LIBAVFORMAT libavformat/avformat.h
get_version LIBAVUTIL   libavutil/avutil.h
get_version LIBAVFILTER libavfilter/avfilter.h

enabled shared && cat >> config.mak <<EOF
LIBTARGET=${LIBTARGET}
SLIBNAME=${SLIBNAME}
SLIBNAME_WITH_VERSION=${SLIBNAME_WITH_VERSION}
SLIBNAME_WITH_MAJOR=${SLIBNAME_WITH_MAJOR}
SLIB_CREATE_DEF_CMD=${SLIB_CREATE_DEF_CMD}
SLIB_EXTRA_CMD=${SLIB_EXTRA_CMD}
SLIB_INSTALL_EXTRA_CMD=${SLIB_INSTALL_EXTRA_CMD}
SLIB_UNINSTALL_EXTRA_CMD=${SLIB_UNINSTALL_EXTRA_CMD}