diff --git a/Makefile.defs b/Makefile.defs
index 072b776..152a1b0 100644
--- a/Makefile.defs
+++ b/Makefile.defs
@@ -127,6 +127,11 @@ perl[Automake__XFile] = automake
 
 libgs.so.9 = ghostscript
 
+# ffmpeg / libav
+libpostproc.so.51 = libpostproc-ffmpeg
+libpostproc.so.51[LIBPOSTPROC_51] = libpostproc-ffmpeg
+ffmpegpresets := ffmpeg-presets
+
 # libreoffice
 libreofficei18n = libreoffice-i18n-$(LANGUAGE)