This issue is fixed in the latest version of loudmouth (https://github.com/engineyard/loudmouth).
***** aclocal *****
***** PWD: /var/tmp/portage/net-libs/loudmouth-1.4.3-r2/work/loudmouth-1.4.3
configure.ac:10: error: 'AM_CONFIG_HEADER': this macro is obsolete.
You should use the 'AC_CONFIG_HEADERS' macro instead.
/usr/share/aclocal-1.13/obsolete-err.m4:12: AM_CONFIG_HEADER is expanded from...
configure.ac:10: the top level
autom4te-2.69: /usr/bin/m4 failed with exit status: 1
aclocal-1.13: error: echo failed with exit status: 1
The issue persists after 2 weeks. Can someone please fix it?
The commit mentioned in comment #0 is the following, which also overhauls the buildsystem: https://github.com/engineyard/loudmouth/commit/8f7254b951e2f4d5d8811027289b1eea391f65f5
I assume for Gentoo purposes it is currently enough to just replace the AM_CONFIG_HEADER macro and not apply the whole patch.
only a warning in automake-1.13.2 again, but fixed anyway for future compability
it's fixed in upstream git already, btw