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diff --git a/version.sh b/version.sh
index 40e8d05..e06443f 100755
--- a/version.sh
+++ b/version.sh
@@ -17,8 +17,8 @@
# Note that the RELEASE-VERSION file should *not* be checked into git;
# please add it to your top-level .gitignore file.
-version=$(git describe)
-if [ -n ${version} ]; then
+[ -d .git ] && version=$(git describe)
+if [ -n "${version}" ]; then
# If we got something from git-describe, write the version to the
# output file.
echo ${version} > RELEASE-VERSION
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