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-rw-r--r--pkgs/tools/video/mjpegtools/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/tools/video/mjpegtools/default.nix b/pkgs/tools/video/mjpegtools/default.nix
index 31d26a6c72a..3e72d8b8af5 100644
--- a/pkgs/tools/video/mjpegtools/default.nix
+++ b/pkgs/tools/video/mjpegtools/default.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
   buildInputs = [ libdv libjpeg libpng ]
               ++ lib.optionals (!withMinimal) [ gtk2 libX11 SDL SDL_gfx ];
 
-  NIX_CFLAGS_COMPILE = lib.optional (!withMinimal) "-I${SDL.dev}/include/SDL";
+  NIX_CFLAGS_COMPILE = lib.optionalString (!withMinimal) "-I${SDL.dev}/include/SDL";
 
   postPatch = ''
     sed -i -e '/ARCHFLAGS=/s:=.*:=:' configure