Backport of this upstream commit, with ports/ readded to the path.
 
commit 14d623bcd178d336b47fdb4f0c973720d56d907c
Author: Szabolcs Nagy <nsz@port70.net>
Date:   Thu Jul 9 09:39:51 2015 +0100
 
    [AArch64][BZ 18400] fix elf_prpsinfo in procfs.h
    
    Kernel uses int pr_uid, pr_gid, but glibc used unsigned short.
    
    This is an ABI breaking change, but the size and alignment of
    the struct and the layout of other members is not changed and
    there is no known usage of pr_uid and pr_gid so it is expected
    to be safe.
    
    	[BZ #18400]
    	* sysdeps/unix/sysv/linux/aarch64/sys/procfs.h (struct elf_prpsinfo):
    	Fix pr_uid and pr_gid members.
 
diff --git a/ports/sysdeps/unix/sysv/linux/aarch64/sys/procfs.h b/ports/sysdeps/unix/sysv/linux/aarch64/sys/procfs.h
index cf5e76c..ecc65ab 100644
--- a/ports/sysdeps/unix/sysv/linux/aarch64/sys/procfs.h
+++ b/ports/sysdeps/unix/sysv/linux/aarch64/sys/procfs.h
@@ -91,8 +91,8 @@ struct elf_prpsinfo
     char pr_zomb;			/* Zombie.  */
     char pr_nice;			/* Nice val.  */
     unsigned long int pr_flag;		/* Flags.  */
-    unsigned short int pr_uid;
-    unsigned short int pr_gid;
+    unsigned int pr_uid;
+    unsigned int pr_gid;
     int pr_pid, pr_ppid, pr_pgrp, pr_sid;
     /* Lots missing */
     char pr_fname[16];			/* Filename of executable.  */