--- cscope-15.6/src/mypopen.c
+++ cscope-15.6/src/mypopen.c
@@ -160,7 +160,7 @@
 		fcntl(yourside, F_DUPFD, stdio);
 #endif
 		close(yourside);
-		execlp(shell, mybasename(shell), "-c", cmd, (void *)0);
+		execlp(shell, mybasename(shell), "-c", cmd, NULL);
 		_exit(1);
 	} else if (pid > 0)
 		tstat = signal(SIGTSTP, SIG_DFL);