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-rw-r--r--pkgs/development/libraries/libmpeg2/default.nix3
1 files changed, 3 insertions, 0 deletions
diff --git a/pkgs/development/libraries/libmpeg2/default.nix b/pkgs/development/libraries/libmpeg2/default.nix
index 7ecac071ce4..19d912e5523 100644
--- a/pkgs/development/libraries/libmpeg2/default.nix
+++ b/pkgs/development/libraries/libmpeg2/default.nix
@@ -9,6 +9,9 @@ stdenv.mkDerivation rec {
     sha256 = "1m3i322n2fwgrvbs1yck7g5md1dbg22bhq5xdqmjpz5m7j4jxqny";
   };
 
+  # Otherwise clang fails with 'duplicate symbol ___sputc'
+  buildFlags = stdenv.lib.optionalString stdenv.isDarwin "CFLAGS=-std=gnu89";
+
   meta = {
     homepage = http://libmpeg2.sourceforge.net/;
     description = "A free library for decoding mpeg-2 and mpeg-1 video streams";