AC_PROG_INSTALL and AC_PROG_MKDIR_P fallbacks

[Thomas Jahns]

Hello,

on a friends Mac I noticed a problem with AC_PROG_MKDIR_P which I believe to
also apply to AC_PROG_INSTALL (albeit not on his system): both fall back on
$ac_install_sh which resolves to the relative path $ac_aux_dir/install-sh if
configure was called with a relative path.

This of course does not work when using MKDIR_P from a sub-directory.

I'd like to provide a patch but I'd first like to discuss the ramifications of
changing the definition of ac_install_sh in lib/autoconf/general.m4 or patching
the two above macros in lib/autoconf/programs.m4.

Thomas

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