[Haiku] configure: error: C++ compiler required on this platform (haiku)

[AliceLR]

The configure script breaks during Makefile generation (Automake?) due to "missing separator" in a temporary Makefile. (R1 Beta 5, up-to-date Autoconf/Automake/GNU Make, found trying to build the BeOS sound driver for #75.)

Thoughts:

• I haven't tried CMake in Haiku yet, is it viable? We should probably have CMake as an alternative to the main Autotools buildsystem to match libxmp, at minimum.
• Is it possible/desirable to ditch Automake (like libxmp)?

[sezero]

Exact error message along with generated files might help.

I haven't tried CMake in Haiku yet, is it viable?

In libxmp it seems to work according to gh workflow runs.

We should probably have CMake as an alternative to the main Autotools buildsystem to match libxmp, at minimum.

It would take a bit of work, but should be doable

Is it possible/desirable to ditch Automake (like libxmp)?

That might introduce issues, I wouldn't advise it.

[sezero]

BTW: Does the 4.2.0 release tarball work correctly?

[AliceLR]

After refreshing my xmp-cli directory (also trying 4.2.0) I can't reproduce this issue. It might have been a side effect of my attempt to work around the actual bug in my environment: C++ detection is broken, with some nonsense error about strcmp declarations conflicting unrelated, it's entirely a configure.ac issue. (4.2.0 also does this.)

If I dnl lines 21 and 22 of configure.ac, configure completes with no error.

edit: renaming the issue to reflect this bug... and hoping this one isn't user error too.
edit: here's config.log and configure:
config.log.gz
configure.gz