This way people will not get surprises regarding the current configure
behaviour and contributors will have a guideline on what is expected.
2) Then type 'make' to build Libav. GNU Make 3.81 or later is required.
3) Type 'make install' to install all binaries and libraries you built.
+
+NOTICE
+
+ - Non system dependencies (e.g. libx264, libvpx) are disabled by default.
+
+ - The default cflags include -g, if you want lean libraries you can either
+ pass --disable-debug or strip the debug symbols at a later time.