fake:

package/public/vlc/vlc.conf

@@ -23,6 +23,8 @@
 pkginstalled libdvdread && var_append confopt ' ' '--enable-dvdread'
 pkginstalled wxwidgets || var_append confopt ' ' '--disable-wxwidgets'
 
+pkginstalled ffmpeg && export LIBS="$LIBS -lpostproc"
+
 # set these so libsmbclient.h and libsmbclient.so are found
 if pkginstalled samba ; then
 	CFLAGS="$CFLAGS -I$root/$pkg_samba_prefix/include"