--- examples/grab_partial_image.c.orig	2006-04-23 13:27:27.000000000 -0700
+++ examples/grab_partial_image.c	2006-04-23 13:31:05.000000000 -0700
@@ -216,7 +213,10 @@
     /*---------------------------------------------------------------------
      *  output elapsed time
      *---------------------------------------------------------------------*/
-    elapsed_time = (float)(times(&tms_buf) - start_time) / CLK_TCK;
+    #ifndef CLOCKS_PER_SEC
+    # define CLOCKS_PER_SEC CLK_TCK
+    #endif
+    elapsed_time = (float)(times(&tms_buf) - start_time) / CLOCKS_PER_SEC;
     printf( "got frame %d. elapsed time: %g sec ==> %g frames/second\n",
             i, elapsed_time, (float)i / elapsed_time);
   }