--- src/wildmidi.c.orig	2010-07-30 09:33:46.000000000 +0900
+++ src/wildmidi.c	2011-05-28 23:13:47.000000000 +0900
@@ -618,7 +618,7 @@
 		return -1;
 	}
 
-	buffer = (unsigned char *) mmap(NULL, max_buffer, mmmode, mmflags, audio_fd, 0);
+	buffer = (char *) mmap(NULL, max_buffer, mmmode, mmflags, audio_fd, 0);
 	if (buffer == MAP_FAILED) {
 		printf("couldn't mmap %s\r\n",strerror(errno));
 		shutdown_output();
@@ -659,12 +659,13 @@
 				shutdown_output();
 				return -1;
 			}
-			if ((count.ptr < counter) || (count.ptr >= (counter+4))) {
+			if (((unsigned long int)count.ptr < counter) ||
+			    ((unsigned long int)count.ptr >= (counter+4))) {
 				break;
 			}
 			usleep(500);
 		}
-		if (count.ptr < counter) {
+		if ((unsigned long int)count.ptr < counter) {
 			free_size = max_buffer - counter;
 		} else {
 			free_size = count.ptr - counter;