diff -up gpac/configure.ffmpeg gpac/configure
--- gpac/configure.ffmpeg	2010-01-16 19:09:26.451865570 +0100
+++ gpac/configure	2010-01-16 19:19:49.604861370 +0100
@@ -852,12 +852,21 @@ fi
 
 #look for FFMPEG support
 
+if pkg-config --exists libavcodec libavformat libswscale 2> /dev/null  ; then
+  ffmpeg_cflags=`pkg-config --cflags libavcodec libavformat libswscale libavutil`
+  ffmpeg_lflags=`pkg-config --libs libavcodec libavformat libswscale libavutil`
+  has_ffmpeg="system"
+else
+  ffmpeg_cflags=``
+  ffmpeg_lflags=`-lz -lavcodec -lavformat`
+fi
+
 cat > $TMPC << EOF
 #include <libavcodec/avcodec.h>
 int main( void ) { return 0; }
 EOF
 
-if $cc $TMPO -c $TMPC 2> /dev/null  ; then
+if $cc $TMPO  $ffmpeg_cflags -c $TMPC 2> /dev/null  ; then
 old_ffmpeg_inc="no"
 else
 
@@ -872,10 +881,10 @@ fi
 
 
 if test "$cross_prefix"  != "" ; then
-  if $cc -o $TMPO $TMPC -I$prefix/include -L$prefix/lib -lz -lavcodec -lavformat -lavutil 2> /dev/null  ; then
+  if $cc -o $TMPO $TMPC -I$prefix/include -L$prefix/lib $ffmpeg_cflags $ffmpeg_lflags 2> /dev/null  ; then
      has_ffmpeg="system"
   else
-     if $cc -o $TMPO $TMPC -I$local_inc -L$local_lib -lz -lavcodec -lavformat 2> /dev/null  ; then
+     if $cc -o $TMPO $TMPC -I$local_inc -L$local_lib $ffmpeg_cflags $ffmpeg_lflags 2> /dev/null  ; then
         has_ffmpeg="local"
         echo OK 
      fi
@@ -1978,6 +1987,10 @@ echo "CONFIG_VORBIS=$has_vorbis" >> conf
 echo "CONFIG_THEORA=$has_theora" >> config.mak
 echo "CONFIG_FFMPEG=$has_ffmpeg" >> config.mak
 echo "CONFIG_FFMPEG_OLD=$old_ffmpeg_inc" >> config.mak
+if test x$has_ffmpeg != x ; then
+  echo "FFMPEG_CFLAGS=$ffmpeg_cflags" >> config.mak
+  echo "FFMPEG_LFLAGS=$ffmpeg_lflags" >> config.mak
+fi
 
 echo "CONFIG_OSS_AUDIO=$has_oss_audio" >> config.mak
 echo "CONFIG_ALSA=$has_alsa" >> config.mak
diff -up gpac/modules/ffmpeg_in/Makefile.ffmpeg gpac/modules/ffmpeg_in/Makefile
--- gpac/modules/ffmpeg_in/Makefile.ffmpeg	2009-07-31 09:37:41.000000000 +0200
+++ gpac/modules/ffmpeg_in/Makefile	2010-01-16 19:09:26.460862249 +0100
@@ -2,7 +2,7 @@ include ../../config.mak
 
 vpath %.c $(SRC_PATH)/modules/ffmpeg_in
 
-CFLAGS= $(OPTFLAGS) -I$(SRC_PATH)/include
+CFLAGS= $(OPTFLAGS) -I$(SRC_PATH)/include $(FFMPEG_CFLAGS)
 
 ifeq ($(DEBUGBUILD), yes)
 CFLAGS+=-g
@@ -15,13 +15,11 @@ LDFLAGS+=-pg
 endif
 
 LOCAL_LIB=
-LINKLIBS=-lgpac -lavcodec -lavformat -lz
+LINKLIBS=-lgpac -lz $(FFMPEG_LFLAGS)
 
 #old ffmpeg lib
 ifeq ($(CONFIG_FFMPEG_OLD), yes)
 CFLAGS+=-DFFMPEG_OLD_HEADERS
-else
-LINKLIBS+=-lswscale
 endif
 
 #common obj