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-rw-r--r--pkgs/development/libraries/gperftools/default.nix5
1 files changed, 2 insertions, 3 deletions
diff --git a/pkgs/development/libraries/gperftools/default.nix b/pkgs/development/libraries/gperftools/default.nix
index bc10c9f9bdd..0e985754985 100644
--- a/pkgs/development/libraries/gperftools/default.nix
+++ b/pkgs/development/libraries/gperftools/default.nix
@@ -16,9 +16,8 @@ stdenv.mkDerivation rec {
     substituteInPlace libtool --replace stdc++ c++
   '';
 
-  NIX_CFLAGS_COMPILE = stdenv.lib.optionals stdenv.isDarwin [
-    "-D_XOPEN_SOURCE" "-Wno-aligned-allocation-unavailable"
-  ];
+  NIX_CFLAGS_COMPILE = stdenv.lib.optionalString stdenv.isDarwin
+    "-D_XOPEN_SOURCE -Wno-aligned-allocation-unavailable";
 
   # some packages want to link to the static tcmalloc_minimal
   # to drop the runtime dependency on gperftools