https://sourceforge.net/p/jfs/bugs/286/
https://bugs.gentoo.org/448844

--- a/libfs/devices.h
+++ b/libfs/devices.h
@@ -42,6 +42,7 @@
 
 struct stat;
 
+#include <stdint.h>
 int ujfs_get_dev_size(FILE *, int64_t * size);
 int ujfs_rw_diskblocks(FILE *, int64_t, int32_t, void *, int32_t);
 int ujfs_flush_dev(FILE *);