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-rw-r--r--pkgs/development/tools/parsing/ragel/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/tools/parsing/ragel/default.nix b/pkgs/development/tools/parsing/ragel/default.nix
index 2f4db7982b7..12c9b9d57f8 100644
--- a/pkgs/development/tools/parsing/ragel/default.nix
+++ b/pkgs/development/tools/parsing/ragel/default.nix
@@ -21,7 +21,7 @@ let
 
       configureFlags = [ "--with-colm=${colm}" ];
 
-      NIX_CFLAGS_COMPILE = stdenv.lib.optional stdenv.cc.isGNU "-std=gnu++98";
+      NIX_CFLAGS_COMPILE = stdenv.lib.optionalString stdenv.cc.isGNU "-std=gnu++98";
 
       doCheck = true;