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-rw-r--r--pkgs/development/compilers/gcc/9/default.nix5
1 files changed, 5 insertions, 0 deletions
diff --git a/pkgs/development/compilers/gcc/9/default.nix b/pkgs/development/compilers/gcc/9/default.nix
index 978ad75a3d2..5f0a69583a1 100644
--- a/pkgs/development/compilers/gcc/9/default.nix
+++ b/pkgs/development/compilers/gcc/9/default.nix
@@ -31,6 +31,11 @@
 , buildPackages
 }:
 
+# 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.
+
 # LTO needs libelf and zlib.
 assert libelf != null -> zlib != null;