--- src/audio_out.c.orig
+++ src/audio_out.c
@@ -1344,7 +1344,7 @@ ao_device *ao_open_file (int driver_id,
 
 		if (!overwrite) {
 			/* Test for file existence */
-			file = fopen(filename, "r");
+			file = fopen(filename, "re");
 			if (file != NULL) {
 				fclose(file);
 				errno = AO_EFILEEXISTS;
@@ -1353,7 +1353,7 @@ ao_device *ao_open_file (int driver_id,
 		}
 
 
-		file = fopen(filename, "w");
+		file = fopen(filename, "we");
 	}
 
 
--- src/config.c.orig
+++ src/config.c
@@ -57,7 +57,7 @@ static int ao_read_config_file(ao_config
 	char line[LINE_LEN];
 	int end;
 
-	if ( !(fp = fopen(config_file, "r")) )
+	if ( !(fp = fopen(config_file, "re")) )
 		return 0; /* Can't open file */
 
 	while (fgets(line, LINE_LEN, fp)) {
--- configure.ac.orig
+++ configure.ac
@@ -30,7 +30,9 @@ dnl Check for programs
 dnl ====================================
 
 cflags_save="$CFLAGS"
-AC_PROG_CC
+AC_PROG_CC_STDC
+AC_USE_SYSTEM_EXTENSIONS
+AC_SYS_LARGEFILE
 AC_LIBTOOL_WIN32_DLL
 AC_LIBTOOL_DLOPEN
 AM_PROG_LIBTOOL