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-rw-r--r--nixpkgs/pkgs/development/libraries/qt-5/mkDerivation.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/nixpkgs/pkgs/development/libraries/qt-5/mkDerivation.nix b/nixpkgs/pkgs/development/libraries/qt-5/mkDerivation.nix
index 95357c096dfd..2c6333cb0204 100644
--- a/nixpkgs/pkgs/development/libraries/qt-5/mkDerivation.nix
+++ b/nixpkgs/pkgs/development/libraries/qt-5/mkDerivation.nix
@@ -12,9 +12,9 @@ let
     qmakeFlags = [ ("CONFIG+=" + (if debug then "debug" else "release")) ]
               ++ (args.qmakeFlags or []);
 
-    NIX_CFLAGS_COMPILE =
+    NIX_CFLAGS_COMPILE = toString (
       optional (!debug) "-DQT_NO_DEBUG"
-      ++ lib.toList (args.NIX_CFLAGS_COMPILE or []);
+      ++ lib.toList (args.NIX_CFLAGS_COMPILE or []));
 
     cmakeFlags =
       (args.cmakeFlags or [])