I don't understand what's happening in the 'aclocal' program. There is
a variable @user_includes with a comment
# @user_includes can be augmented with -I or AC_CONFIG_MACRO_DIRS.
So, from this comment, it sounds strange that specifying the m4 macro dirs
through AC_CONFIG_MACRO_DIRS produces a dif
According to the Autoconf documentation
https://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.71/html_node/Input.html
"Packages that use aclocal to generate aclocal.m4 should declare where
local macros can be found using AC_CONFIG_MACRO_DIRS."
and
"Note that if you use acloca
