sbcl: create version file if none exists

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.

1 files changed, 6 insertions, 0 deletions

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 = ''