--- examples/grab_partial_image.c.orig	2005-08-18 11:03:06 +0400
+++ examples/grab_partial_image.c	2006-12-09 01:05:25 +0300
@@ -38,6 +38,7 @@
 #include <stdlib.h>
 #include <time.h>
 #include <sys/times.h>
+#include <unistd.h>
 
 
 int main(int argc, char *argv[]) 
@@ -218,7 +219,7 @@
     /*---------------------------------------------------------------------
      *  output elapsed time
      *---------------------------------------------------------------------*/
-    elapsed_time = (float)(times(&tms_buf) - start_time) / CLK_TCK;
+    elapsed_time = (float)(times(&tms_buf) - start_time) / sysconf(_SC_CLK_TCK);
     printf( "got frame %d. elapsed time: %g sec ==> %g frames/second\n",
             i, elapsed_time, (float)i / elapsed_time);
   }