diff --git a/autogen.sh b/autogen.sh
diff --git a/stepmake/aclocal.m4 b/stepmake/aclocal.m4
index 25a0f54..4741798 100644
--- a/stepmake/aclocal.m4
+++ b/stepmake/aclocal.m4
@@ -34,7 +34,7 @@ AC_DEFUN(STEPMAKE_GET_VERSION, [
     ## grab the first version number in  --version output.
     eval _ver=\"\`("$1" --version || "$1" -V) 2>&1 | grep '\(^\| \)[0-9][0-9]*\.[0-9]' \
         | head -n 1 \
-	| tr ' ' '\n' | sed 's/\([0-9][0-9]*\.[0-9][0-9]*\).*/\1/g' | grep '\(^\| \)[0-9][0-9]*\.[0-9]' | head -n 1\`\"
+	| tr ' ' '\n' | sed 's/\([0-9][0-9]*(\.[0-9][0-9]*)*\).*/\1/g' | grep '\(^\| \)[0-9][0-9]*\.[0-9]' | head -n 1\`\"
 
     if test -z "$_ver"; then
         ## If empty, try date [fontforge]