configure.in uses AC_LANG_RESTORE although the language is not set

[Thomas Kahle <tom111@…>]

After unpacking the tarball trying to run autoconf fails:

~/temp/Singular/Singular-3-1-1 $ autoconf configure.in:471: error: m4_defn: undefined macro: _AC_LANG ../../lib/autoconf/lang.m4:108: AC_LANG_POP is expanded from... ../../lib/autoconf/lang.m4:135: AC_LANG_RESTORE is expanded from... configure.in:471: the top level autom4te-2.65: /usr/bin/m4 failed with exit status: 1

This is caused by line 471 where AC_LANG_RESTORE is called although the language was never set.

[hannes]

you need autocnf 2.13 to generate configure from configure.in. Therefore autoconf should usually not be called (and no Makefile will do it). This needs to be updated (some day) and there are a lot more problems then just AC_LANG_RESTORE. It is just a lot of work and not our top priority.