$OpenBSD$
Make it compile with real FFmpeg.
--- mk/buildtools/Makefile.global.in.orig	Tue Oct  1 16:36:31 2013
+++ mk/buildtools/Makefile.global.in	Tue Oct  1 23:25:59 2013
@@ -48,6 +48,7 @@ AM_CXXFLAGS+=-D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURC
 ifdef VS_WARN_ISERROR
   AM_CXXFLAGS+=-Werror
 endif
+AM_CXXFLAGS+=-Wno-error=deprecated-declarations -Wno-error=unused
 ifdef VS_OS_WINDOWS
   AM_CPPFLAGS+=-DVS_OS_WINDOWS=1
 endif
