1 files changed, 7 insertions, 2 deletions
diff --git a/nixpkgs/pkgs/development/tools/parsing/bison/default.nix b/nixpkgs/pkgs/development/tools/parsing/bison/default.nix
index c9758fe21e3..ca422f931da 100644
--- a/nixpkgs/pkgs/development/tools/parsing/bison/default.nix
+++ b/nixpkgs/pkgs/development/tools/parsing/bison/default.nix
@@ -1,12 +1,17 @@
 { stdenv, fetchurl, m4, perl, help2man }:
 
+# Note: this package is used for bootstrapping fetchurl, and thus
+# cannot use fetchpatch! All mutable patches (generated by GitHub or
+# cgit) that are needed here should be included directly in Nixpkgs as
+# files.
+
 stdenv.mkDerivation rec {
   pname = "bison";
-  version = "3.5.4";
+  version = "3.7.1";
 
   src = fetchurl {
     url = "mirror://gnu/${pname}/${pname}-${version}.tar.gz";
-    sha256 = "0a2cbrqh7mgx2dwf5qm10v68iakv1i0dqh9di4x5aqxsz96ibpf0";
+    sha256 = "04vx6sah3bnr3a5n9knw306sb3y41pjfl7k9ihbsimghkj1m5n8x";
   };
 
   nativeBuildInputs = [ m4 perl ] ++ stdenv.lib.optional stdenv.isSunOS help2man;