Diff to add libavcodec dependency to vapoursynth.

libavcodec_dep.diff

diff --git a/INSTALL b/INSTALL
index b3814a7..8cbb454 100644
--- a/INSTALL
+++ b/INSTALL
@@ -5,8 +5,8 @@ First, a couple of things to note:
 
 * You need to be on Windows, Linux, or OS X.
 * You need to have the QtCore libraries and headers installed.
-* You need to have the libraries and headers for libavutil
-  and libswscale installed.
+* You need to have the libraries and headers for libavutil,
+  libswscale, and libavcodec installed.
 * You need to have either GCC, Clang, MSVC, or ICC/ICL installed.
   Both a C and C++ compiler are required.
 * You need to have Yasm installed.
diff --git a/wscript b/wscript
index b18d026..faa8a98 100644
--- a/wscript
+++ b/wscript
@@ -263,6 +263,10 @@ def configure(conf):
     conf.check_cc(use = ['AVUTIL'], header_name = 'libavutil/avutil.h')
     conf.check_cc(use = ['AVUTIL'], header_name = 'libavutil/avutil.h', function_name = 'avutil_license')
 
+    conf.check_cc(lib = 'avcodec')
+    conf.check_cc(use = ['AVCODEC'], header_name = 'libavcodec/avcodec.h')
+    conf.check_cc(use = ['AVCODEC'], header_name = 'libavcodec/avcodec.h', function_name = 'avcodec_license')
+
     conf.check_cc(lib = 'swscale')
     conf.check_cc(use = ['SWSCALE'], header_name = 'libswscale/swscale.h')
     conf.check_cc(use = ['SWSCALE'], header_name = 'libswscale/swscale.h', function_name = 'swscale_license')
@@ -323,7 +327,7 @@ def build(bld):
 
     bld(features = 'c qxx asm',
         includes = 'include',
-        use = ['QTCORE', 'SWSCALE', 'AVUTIL'],
+        use = ['QTCORE', 'SWSCALE', 'AVUTIL', 'AVCODEC'],
         source = bld.path.ant_glob(sources),
         target = 'objs')

This is necessary in order to compile the src/core/vsresize.c file in Vapoursynth.