diff -Nur giflib-5.1.4/configure.ac new/configure.ac
--- giflib-5.1.4/configure.ac	2016-05-13 17:43:01.232661891 +0200
+++ new/configure.ac	2016-05-13 17:42:47.136471014 +0200
@@ -12,7 +12,7 @@
 AC_CONFIG_MACRO_DIR([m4])
 
 dnl Checks for programs.
-AM_PROG_AR
+m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
 AC_PROG_CC_STDC
 AC_USE_SYSTEM_EXTENSIONS
 AC_SYS_LARGEFILE