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diff --git a/support/git-rev.sh b/support/git-rev.sh
index 5dce3d0..4aadae6 100755
--- a/support/git-rev.sh
+++ b/support/git-rev.sh
@@ -1,5 +1,8 @@
#!/bin/sh
## cmake doesn't read the variable when it doesn't end with a newline, and I haven't figured out how to have it add a newline directly...
-echo -n "`git --no-pager log --abbrev=7 -n 1 --pretty=format:"%h"`\n"
-
+if [ -d .git ]; then
+ echo "`git --no-pager log --abbrev=7 -n 1 --pretty=format:"%h"`"
+else
+ echo "<unknown>"
+fi
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