update readme and warning

README.md

@@ -24,12 +24,37 @@ Configuration is done through environment variables.
 By default, this project will build a static `ffmpeg` binary in `./gitignore/sysroot/bin/ffmpeg`.
 
 The user-overridable compile options are:
-- `ENABLE`: configure what ffmpeg enables (default: libaom libass libvpx libxml2 libvmaf libx264 libx265 libwebp libopus librav1e libdav1d libvorbis libmp3lame libfribidi libfreetype libharfbuzz libopenjpeg libsvtav1_hdr libfontconfig )
+- `ENABLE`: configure what ffmpeg enables (default: 
+lcms2
+libaom
+libass
+libvpx
+libjxl
+libxml2
+libvmaf
+libx264
+libx265
+libwebp
+libopus
+librav1e
+libdav1d
+libbluray
+libsnappy
+libvorbis
+libmp3lame
+libfribidi
+libfreetype
+libharfbuzz
+libopenjpeg
+libsvtav1_hdr
+libfontconfig
+)
 - `PREFIX`: prefix to install to, default is local install in ./gitignore/sysroot (default: local)
 - `STATIC`: static or shared build (default: ON)
 - `LTO`: enable link time optimization (default: ON)
 - `CLEAN`: clean build directories before building (default: ON)
 - `PGO`: enable profile guided optimization (default: OFF)
+- `PACKAGE`: package ffmpeg binaries to tarball in ./gitignore/package (default: OFF)
 - `ARCH`: architecture type (x86-64-v{1,2,3,4}, armv8-a, etc) (default: native)
 - `OPT`: optimization level (0-3) (default: 3)