https://bugs.gentoo.org/715698
--- a/src/mp3track.cc
+++ b/src/mp3track.cc
@@ -33,6 +33,7 @@
 #include <sys/stat.h>
 #include <signal.h>
 #include <unistd.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <netinet/in.h>
 
@@ -55,8 +56,8 @@ static int cpid = -1, trackcount = 0;
 static FILE *fpread, *fpwrite;
 static char cbuf[65535];
 
-static u_int32_t extract_bitfield(unsigned char *h, int start, int end) {
-    u_int32_t hdr;
+static uint32_t extract_bitfield(unsigned char *h, int start, int end) {
+    uint32_t hdr;
     memcpy(&hdr, h, 4);
     hdr = ntohl(hdr);
     hdr = hdr << start;
@@ -237,7 +238,7 @@ void mp3track::readtag() {
 	11025, 12000, 8000, 0
     };
 
-    u_int32_t aux;
+    uint32_t aux;
     int i, filelen;
 
     if(f.is_open()) {