aclocal accepts the following options:
--acdir=dir
--help
-I dir
.m4 files.
--output=file
aclocal.m4.
--print-ac-dir
aclocal will search to
find third-party .m4 files. When this option is given, normal
processing is suppressed. This option can be used by a package to
determine where to install a macro file.
--verbose
--version