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-rw-r--r--pkgs/tools/networking/libreswan/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/tools/networking/libreswan/default.nix b/pkgs/tools/networking/libreswan/default.nix
index e48f2d7aa5b..4c8b926b582 100644
--- a/pkgs/tools/networking/libreswan/default.nix
+++ b/pkgs/tools/networking/libreswan/default.nix
@@ -26,7 +26,7 @@ stdenv.mkDerivation {
   };
 
   # These flags were added to compile v3.18. Try to lift them when updating.
-  NIX_CFLAGS_COMPILE = [ "-Wno-error=redundant-decls" "-Wno-error=format-nonliteral"
+  NIX_CFLAGS_COMPILE = toString [ "-Wno-error=redundant-decls" "-Wno-error=format-nonliteral"
     # these flags were added to build with gcc7
     "-Wno-error=implicit-fallthrough"
     "-Wno-error=format-truncation"