It does a git pull, adds autobuild stuff, and then builds and mails to the server:
http://autobuild.josefsson.org/guile/ but I can reproduce this with autoconf -I m4 The issue seems to be that gl_LOCALCHARSET is used but not defined. Also, autogen.sh is awkward on NetBSD because traditional m4 is in /usr/bin/m4 and the gnu extended version as /usr/pkg/bin/m4. I think that's actually fine when it runs because autoconf found it when the autoconf package was built, but the m4 --version fails because --version is a gnu extension. And, I don't understand how autoreconf knows to look in m4, but perhaps it does and the issue is that even with the m4 subdir things are still undefined. On your system, where do the definitions of the missing macros I listed come from?
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