Hello Gretl masters :)

I am trying to make a build pipeline in GitHub Actions, with the goal to have Linux snapshots (.rpm, .deb). I am experimenting first on my copy of sourceforge, but to make it in the official github clone setup by Artur Tarassow.

I am finding this blocking error:

CC xml_get.lo
LD xml_get.la
CC svm.lo
CXX svmlib.lo
libtool: error: specify a tag with '--tag'
make[1]: *** [Makefile:271: svmlib.lo] Error 1

I don't have this problem in my Fedora 38, and I am not sure what is missing in the github actions configuration. I observe that the only time a CXX is used in the building is where it is failing. I also modified configure to use --tag=CC or --tag=CXX in libtool sommand, but it did not changed the result.

Anyway, what could be missing in this setup?
The configuration file is this one: https://raw.githubusercontent.com/HelioGuilherme66/gretl/actions/.github/workflows/linux.yml

And you can see it in the Actions tab: https://github.com/HelioGuilherme66/gretl/actions/runs/5105874817/workflow