* checks/check-them: Use portable = in test.
* src/Makefile.am (AM_CPPFLAGS): Omit space between -I and
directory, as required by Solaris cc. Include built headers, as
required by Solaris make in VPATH build.
* checks/Makefile.in: Use $(srcdir) where needed.
(CHECKS): Factor $(srcdir) into macro.
(DISTFILES): Likewise. Automake takes care of distributing
Makefile.in.
(dist): Simplify.
(Makefile): Use modern syntax of config.status.
* doc/m4.texinfo (Loops, Include, Undivert, Incompatibilities):
Avoid overfull and underfull hboxes in dvi.