fix warning when no args

diff --git a/mkdefaults b/mkdefaults
index 0da1f2e563d6de5b87bb585f778956e2afc2d82d..c092361b48d9cfed355155fac149bb97bff7e8b4 100755 (executable)
--- a/mkdefaults
+++ b/mkdefaults
@@ -9,7 +9,7 @@
 #      description (or NULL)
 
 # Deal with optional -o (output) argument
-if ($ARGV[0] eq "-o") {
+if ($#ARGV == 1 && $ARGV[0] eq "-o") {
     shift;
     $header = $cfile = shift;
     $header .= '.h';