and then configure outputs Makefile with substitutions:
libexecdir = ${exec_prefix}/lib/${PACKAGE}
Why doesn't it output this?
libexecdir = /usr/local/lib/foopackage
Is that because DISTDIR could be set at make install?
Yes. It's a GNU standard requirement, and it's a FAQ. It seems that the Autoconf manual for the latest version is not online, but here's the node for 2.57:
http://www.gnu.org/software/autoconf/manual/autoconf-2.57/html_node/autoconf_179.html#SEC179
If that's the only case then I can expand that at configure time and let configure make my substitutions. I just want to make sure there wasn't some other reason.
I don't know of any other. While expanding it at configure time is an option, you should take a look at the FAQ and at the node "Installation Directory Variables" of the Autoconf manual. One of the suggestions is substituting through sed at make time, similar to what you did. -- Leonardo Boiko
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