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-rw-r--r--pkgs/development/tools/documentation/doxygen/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/tools/documentation/doxygen/default.nix b/pkgs/development/tools/documentation/doxygen/default.nix
index 0e20d690fd7..af73ce25d42 100644
--- a/pkgs/development/tools/documentation/doxygen/default.nix
+++ b/pkgs/development/tools/documentation/doxygen/default.nix
@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
     stdenv.lib.optional (qt4 != null) "-Dbuild_wizard=YES";
 
   NIX_CFLAGS_COMPILE =
-    stdenv.lib.optional stdenv.isDarwin "-mmacosx-version-min=10.9";
+    stdenv.lib.optionalString stdenv.isDarwin "-mmacosx-version-min=10.9";
 
   enableParallelBuilding = true;
   doCheck = false; # fails