-echo "Usage: ./configure [options]"
-echo ""
-echo "available options:"
-echo ""
-echo " --help print this message"
-echo " --disable-avs disables avisynth support (windows only)"
-echo " --disable-lavf disables libavformat support"
-echo " --disable-ffms disables ffmpegsource support"
-echo " --disable-gpac disables gpac support"
-echo " --disable-gpl disables GPL-only features"
-echo " --disable-pthread disables multithreaded encoding"
-echo " --disable-swscale disables swscale support"
-echo " --disable-asm disables platform-specific assembly optimizations"
-echo " --enable-debug adds -g, doesn't strip"
-echo " --enable-gprof adds -pg, doesn't strip"
-echo " --enable-visualize enables visualization (X11 only)"
-echo " --enable-pic build position-independent code"
-echo " --enable-shared build libx264.so"
-echo " --bit-depth=BIT_DEPTH sets output bit depth (8-10), default 8"
-echo " --extra-asflags=EASFLAGS add EASFLAGS to ASFLAGS"
-echo " --extra-cflags=ECFLAGS add ECFLAGS to CFLAGS"
-echo " --extra-ldflags=ELDFLAGS add ELDFLAGS to LDFLAGS"
-echo " --host=HOST build programs to run on HOST"
-echo " --cross-prefix=PREFIX use PREFIX for compilation tools"
-echo " --sysroot=SYSROOT root of cross-build tree"
-echo ""