The ancient autoconfiscation does not support modern gcc

[rfc1036]

When using gcc 14 on Debian testing, many of the configure tests fail because modern gcc is stricter in rejecting some C language errors in the tests. The effect is that e.g. zlib is not found and the values of ACCEPT_TYPE_ARG3, MEMCMP_BROKEN and NBLOCK_POSIX are wrong.

A workaround is to run configure with e.g. CFLAGS='-g -O2 -fpermissive'.

Related: it should be possible to rebuild configure with a modern version of autoconf.

[patrick-irc]

Does it happen on 2.12.0 too? Because we have rebuilt the configure script there (#63).

[rfc1036]

I am using the master branch, which contains that commit. It was rebuilt by the obsolete autoconf 2.69 instead of a current version.

But I think that the tests themselves need to be fixed by including some more headers.

The current configure.in is a bit hairy, but many parts could be removed by dropping support for the retrocomputing targets.