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-rw-r--r--pkgs/development/libraries/mps/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/libraries/mps/default.nix b/pkgs/development/libraries/mps/default.nix
index ec3b4e20147..8c1f3aea466 100644
--- a/pkgs/development/libraries/mps/default.nix
+++ b/pkgs/development/libraries/mps/default.nix
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
   buildInputs = [ sqlite ];
 
   # needed for 1.116.0 to build with gcc7
-  NIX_CFLAGS_COMPILE = [
+  NIX_CFLAGS_COMPILE = toString [
     "-Wno-implicit-fallthrough"
     "-Wno-error=clobbered"
     "-Wno-error=cast-function-type"