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computing the absolute path to d1 in the source hierarchy: it may not exist at all. So don't cd into it. From Alexandre Duret-Lutz. http://mail.gnu.org/archive/html/bug-autoconf/2003-10/msg00205.html * lib/m4sugar/m4sh.m4 (AS_SET_CATFILE): New. From Paul Eggert, but named after Perl's IO::Spec->catfile. * doc/autoconf.texi (Programming in M4sh): Document. * lib/autoconf/status.m4 (_AC_SRCPATHS): Use it.