+cat <<EOF
+Usage: ./configure [options]
+
+Help:
+ -h, --help print this message
+
+Standard options:
+ --prefix=PREFIX install architecture-independent files in PREFIX
+ [/usr/local]
+ --exec-prefix=EPREFIX install architecture-dependent files in EPREFIX
+ [PREFIX]
+ --bindir=DIR install binaries in DIR [EPREFIX/bin]
+ --libdir=DIR install libs in DIR [EPREFIX/lib]
+ --includedir=DIR install includes in DIR [PREFIX/include]
+ --extra-asflags=EASFLAGS add EASFLAGS to ASFLAGS
+ --extra-cflags=ECFLAGS add ECFLAGS to CFLAGS
+ --extra-ldflags=ELDFLAGS add ELDFLAGS to LDFLAGS
+ --extra-rcflags=ERCFLAGS add ERCFLAGS to RCFLAGS
+
+Configuration options:
+ --disable-cli disable cli
+ --system-libx264 use system libx264 instead of internal
+ --enable-shared build shared library
+ --enable-static build static library
+ --disable-opencl disable OpenCL features
+ --disable-gpl disable GPL-only features
+ --disable-thread disable multithreaded encoding
+ --enable-win32thread use win32threads (windows only)
+ --disable-interlaced disable interlaced encoding support
+ --bit-depth=BIT_DEPTH set output bit depth (8-10) [8]
+ --chroma-format=FORMAT output chroma format (420, 422, 444, all) [all]
+
+Advanced options:
+ --disable-asm disable platform-specific assembly optimizations
+ --enable-debug add -g
+ --enable-gprof add -pg
+ --enable-strip add -s
+ --enable-pic build position-independent code
+
+Cross-compilation:
+ --host=HOST build programs to run on HOST
+ --cross-prefix=PREFIX use PREFIX for compilation tools
+ --sysroot=SYSROOT root of cross-build tree
+
+External library support:
+ --disable-avs disable avisynth support
+ --disable-swscale disable swscale support
+ --disable-lavf disable libavformat support
+ --disable-ffms disable ffmpegsource support
+ --disable-gpac disable gpac support
+ --disable-lsmash disable lsmash support