https://bugs.gentoo.org/713714
--- a/ifenslave.c
+++ b/ifenslave.c
@@ -148,6 +148,7 @@ static const char *help_msg =
 "\n";
 
 #include <unistd.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <ctype.h>
@@ -164,10 +165,10 @@ static const char *help_msg =
 #include <linux/if_bonding.h>
 #include <linux/sockios.h>
 
-typedef unsigned long long u64;	/* hack, so we may include kernel's ethtool.h */
-typedef __uint32_t u32;		/* ditto */
-typedef __uint16_t u16;		/* ditto */
-typedef __uint8_t u8;		/* ditto */
+typedef uint64_t u64;	/* hack, so we may include kernel's ethtool.h */
+typedef uint32_t u32;		/* ditto */
+typedef uint16_t u16;		/* ditto */
+typedef uint8_t u8;		/* ditto */
 #include <linux/ethtool.h>
 
 struct option longopts[] = {