Index: examples/c/x22c.c
===================================================================
--- examples/c/x22c.c	(revision 12666)
+++ examples/c/x22c.c	(working copy)
@@ -36,6 +36,8 @@
 static PLFLT arrow2_x[6] = { -0.5, 0.3, 0.3, 0.5, 0.3, 0.3 };
 static PLFLT arrow2_y[6] = { 0.0, 0.0, 0.2, 0.0, -0.2, 0.0 };
 
+#define NC 11
+
 //--------------------------------------------------------------------------
 // main
 //
@@ -195,14 +197,14 @@
     int       i, j;
     PLFLT     dx, dy, x, y;
     PLFLT     xmin, xmax, ymin, ymax;
-    PLFLT     Q, b, dbdx;
+    PLFLT     Q, b;
     PLcGrid2  cgrid2;
     PLFLT     **u, **v;
     const int nx   = 20;
     const int ny   = 20;
-    const int nc   = 11;
+    const int nc   = NC;
     const int nseg = 20;
-    PLFLT     clev[nc];
+    PLFLT     clev[NC];
 
     dx = 1.0;
     dy = 1.0;