Initial patch for ffmpeg to give haiku it's own case in configure, more settings may be added in as we figure out what works and what doesn't.

media-video/ffmpeg/ffmpeg-haiku.diff

@@ -0,0 +1,26 @@
+Index: configure
+===================================================================
+--- configure	(revision 17861)
++++ configure	(working copy)
+@@ -1512,7 +1512,7 @@
+ 
+ # OS specific
+ case $target_os in
+-    beos|haiku|zeta)
++    beos|zeta)
+         prefix_default="$HOME/config"
+         # helps building libavcodec
+         add_cflags -DPIC -fomit-frame-pointer
+@@ -1538,6 +1538,13 @@
+             enable beos_netserver
+             network_extralibs="-lnet"
+         fi ;;
++    haiku)
++        prefix_default="/boot/common"
++        disable audio_beos
++        enable beosthreads
++        network_extralibs="-lnetwork"
++        ;;
+     sunos)
+         FFSERVERLDFLAGS=""
+         SHFLAGS='-shared -Wl,-h,$$(@F)'