From 9c6dd168d75322feeeaad557998f71a15f0fedcb Mon Sep 17 00:00:00 2001
From: Thomas Gerbet <thomas@gerbet.me>
Date: Sat, 8 May 2021 11:12:52 +0200
Subject: [PATCH] falcon: fix the build

---
 pkgs/development/interpreters/falcon/default.nix | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/interpreters/falcon/default.nix b/pkgs/development/interpreters/falcon/default.nix
index ecac643f1ea..2b14c9b489d 100644
--- a/pkgs/development/interpreters/falcon/default.nix
+++ b/pkgs/development/interpreters/falcon/default.nix
@@ -11,12 +11,16 @@ stdenv.mkDerivation {
     sha256 = "1x3gdcz1gqhi060ngqi0ghryf69v8bn50yrbzfad8bhblvhzzdlf";
   };
 
+  # -Wnarrowing is enabled by default in recent GCC versions,
+  # causing compilation to fail.
+  NIX_CFLAGS_COMPILE = "-Wno-narrowing";
+
   nativeBuildInputs = [ cmake pkg-config ];
   buildInputs = [ pcre zlib sqlite ];
 
   meta = with lib; {
     description = "Programming language with macros and syntax at once";
-    license = licenses.gpl2;
+    license = licenses.gpl2Only;
     maintainers = with maintainers; [ pSub ];
     platforms = with platforms; linux;
   };