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-rw-r--r--pkgs/development/libraries/libcdr/default.nix3
1 files changed, 1 insertions, 2 deletions
diff --git a/pkgs/development/libraries/libcdr/default.nix b/pkgs/development/libraries/libcdr/default.nix
index fa309dc8844..5e46f4dc699 100644
--- a/pkgs/development/libraries/libcdr/default.nix
+++ b/pkgs/development/libraries/libcdr/default.nix
@@ -18,8 +18,7 @@ stdenv.mkDerivation rec {
     sed -i 's,^CPPFLAGS.*,\0 -DBOOST_ERROR_CODE_HEADER_ONLY -DBOOST_SYSTEM_NO_DEPRECATED,' src/lib/Makefile.in
   '';
 
-  configureFlags = if stdenv.cc.isClang
-    then [ "--disable-werror" ] else null;
+  configureFlags = stdenv.lib.optional stdenv.cc.isClang "--disable-werror";
 
   CXXFLAGS="--std=gnu++0x"; # For c++11 constants in lcms2.h