gentoo-overlay/media-gfx/enblend/files/enblend-4.1.3-vigra_check.patch

--- a/ConfigureChecks.cmake	2013-10-07 10:50:00.000000000 +0400
+++ b/ConfigureChecks.cmake	2015-03-31 13:42:40.179527224 +0300
@@ -53,7 +53,7 @@
 if(VIGRA_FOUND AND NOT VIGRA_VERSION_CHECK)
   unset(VIGRA_SETIMAGEINDEX CACHE)
   set(CMAKE_REQUIRED_INCLUDES ${VIGRA_INCLUDE_DIR})
-  set(CMAKE_REQUIRED_LIBRARIES ${VIGRA_LIBRARIES})
+  set(CMAKE_REQUIRED_LIBRARIES ${VIGRA_LIBRARIES} -lpthread)
   check_cxx_source_compiles(
   "
   #include <vigra/imageinfo.hxx>