Manjaro + LinuxCNC?

I have done another try to have the 2.8.2 build ok but failed on classicladder..
I have install a RTpreempt kernel.. and now try with configure with specify the python27 this work best on manjaro

./configure --with-realtime=uspace --enable-non-distributable=yes --with-boost-python=python27 --with-python=python2

but when make give error
make: *** [hal/classicladder/Submakefile:49 : ../bin/classicladder] Erreur 1

And this is curious because with the devel version 2.9 any problem on this ??

If Manjaro is a rolling release and is currently using the 5.15 kernel  I really think you are wasting your time trying to build v2.8 on that platform. V2.9 would have a much higher chance of building.