I was wondering if it's possible to have guile 1.8 and guile 2.0 installed on the same system? I remember reading in the documentation that it is, but I haven't been able to pull it off yet, except by using different --prefix values for each.
pkgsrc (a packaging system originally for NetBSD, but also supports other BSDs, Linux, *Solaris, and others) doesn't have guile 2 yet (my fault :-) but has 1.6 and 1.8. 1.8 is installed normally (--prefix=/usr/pkg, named guile) and guile1.6 is installed --prefix=/usr/pkg/guile/1.6. So that's a data point about others' approach to your problem. I don't know enough about the autotools to know what to do with guile.m4. Does automake/autoconf expect the file name to match something, or does it only look at the definitions inside, in which case it could simply be moved. You only need that to run autoconf on programs that depend on guile, and either should be ok. So you could patch it out of the 2.0 build. But having a separate prefix seems easiest. What's wrong (or actually problematic) about using /usr/guile2 as the prefix for guile 2.0, and putting it in your path and/or passing that for building other things?
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