Original commit message from CVS:
* create a configure.base file, containing the contents of
configure.{in,ac}, with those lines specific to one file prepended by
"SUBSTFOR configure.in:" or "SUBSTFOR configure.ac:" appropriately.
* Add lines to autogen.sh to generate configure.in and configure.ac
automatically from this file. (Very simple sed scripts)
* Remove configure.in and configure.ac
This shouldn't cause any problems to anyone, and should make it easy to do
work on configure scripts by just working on configure.base.
