gvpr: squash -Wundef warning for 'DEBUG'

diff --git a/lib/gvpr/compile.c b/lib/gvpr/compile.c
index e907c1db9d165ff343cb7a82732a9bfbaebd0f4a..e6548fc6cf672bfbcbdd07b1e976b2ba02e56393 100644 (file)
--- a/lib/gvpr/compile.c
+++ b/lib/gvpr/compile.c
@@ -196,7 +196,7 @@ static int posOf(Agnode_t* np, int idx, double* v)
     
 }
 
-#if DEBUG > 1
+#if defined(DEBUG) && DEBUG > 1
 static char *symName(Expr_t * ex, int op)
 {
     if (op >= MINNAME && op <= MAXNAME)