I ran into this problem when building bleeding-edge GNU Emacs
with gcc -fsanitize=address on Fedora 23. On this platform
the ACL library does not pass the 'configure' test and Emacs
then does not build due in part to what appear to be typos in the
ACL part of Gnulib.
* lib/acl-internal.c (free_permission_context):
* lib/acl-internal.h (struct permission_context):
Test whether USE_ACL is nonzero, not whether it is defined.