From a91049c31af80098801d6bc7588ffe9354d30ecb Mon Sep 17 00:00:00 2001
From: Hraban Luyat <hraban@0brg.net>
Date: Thu, 21 Mar 2024 11:08:30 -0400
Subject: [PATCH] sbcl: create version file if none exists
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Fallback for when there is no such file (e.g. building from git)

The blanket recreation of this file was removed by me in
d09db9c0967989234a07a4188f43392271b5ed7e but I hadn’t considered this edge case.
---
 pkgs/development/compilers/sbcl/default.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pkgs/development/compilers/sbcl/default.nix b/pkgs/development/compilers/sbcl/default.nix
index 78b3ed07602b..2371ed651950 100644
--- a/pkgs/development/compilers/sbcl/default.nix
+++ b/pkgs/development/compilers/sbcl/default.nix
@@ -146,6 +146,12 @@ stdenv.mkDerivation (self: rec {
         --replace-quiet /bin/uname "${coreutils}/bin/uname" \
         --replace-quiet /bin/sh "${stdenv.shell}"
     )
+    # Official source release tarballs will have a version.lispexpr, but if you
+    # want to override { src = ... } it might not exist. It’s required for
+    # building, so create a mock version as a backup.
+    if [[ ! -a version.lisp-expr ]]; then
+      echo '"${version}.nixos"' > version.lisp-expr
+    fi
   '';
 
   preBuild = ''