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-rw-r--r--pkgs/tools/networking/ntopng/default.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/tools/networking/ntopng/default.nix b/pkgs/tools/networking/ntopng/default.nix
index 0c693ac6288..68f80106031 100644
--- a/pkgs/tools/networking/ntopng/default.nix
+++ b/pkgs/tools/networking/ntopng/default.nix
@@ -54,8 +54,8 @@ stdenv.mkDerivation rec {
     sed 's|LIBS += -lstdc++.6||' -i Makefile
   '';
 
-  NIX_CFLAGS_COMPILE = [ "-fpermissive" ]
-    ++ stdenv.lib.optional stdenv.cc.isClang "-Wno-error=reserved-user-defined-literal";
+  NIX_CFLAGS_COMPILE = "-fpermissive"
+    + stdenv.lib.optionalString stdenv.cc.isClang " -Wno-error=reserved-user-defined-literal";
 
   meta = with stdenv.lib; {
     description = "High-speed web-based traffic analysis and flow collection tool";