diff -up sbcl-1.3.0/generate-version.sh.generate_version sbcl-1.3.0/generate-version.sh
--- sbcl-1.3.0/generate-version.sh.generate_version	2015-10-31 09:50:48.000000000 -0500
+++ sbcl-1.3.0/generate-version.sh	2015-11-11 11:35:55.154498800 -0600
@@ -2,7 +2,7 @@
 
 git_available_p() {
     # Check that (1) we have git (2) this is a git tree.
-    if ( command -v git >/dev/null && git describe >/dev/null 2>/dev/null )
+    if ( test -d .git && command -v git >/dev/null && git describe >/dev/null 2>/dev/null )
     then
         echo "ok"
     else