Without this patch, the build fails on Solaris 10 with the diagnostic
“Undefined symbol acl_trivial first referenced in file
../lib/libgnu.a(file-has-acl.o)”.
* lib-src/Makefile.in (LIB_HAS_ACL): New macro.
(emacsclient${EXEEXT}): Link with $(LIB_HAS_ACL).
This directory contains the source code for the architecture-dependent
files that go in ${archlibdir}. At present, these are mostly utility
programs used by GNU Emacs.