can't build on ARM-based macs

[BenWibking]

If I install openmotif with Homebrew as recommended in the documentation (https://amrex-codes.github.io/amrex/docs_html/Visualization.html#building-amrvis-on-macos), I get a compile error when trying to build Amrvis.

This is because XQuartz 2.8.0+ has removed X11/extensions/Print.h (see here: XQuartz/XQuartz#131).

Unfortunately, XQuartz 2.8.0 and newer are the only versions that run on ARM-based Macs, so it does not appear possible to build Amrvis on ARM-based Macs, unless there is a way to install Openmotif without requiring the Print.h header.

[BenWibking]

I can actually build Motif 2.3.8 from source (https://sourceforge.net/projects/motif/files/Motif%202.3.8%20Source%20Code/motif-2.3.8.tar.gz/download), as long as I specify gcc rather than Apple Clang via:
CC=gcc-12 ./configure --prefix=$HOME/motif_install.

I then run into the issue in #27 when building Amrvis itself.

[BenWibking]

For some reason, using the paths in /opt/homebrew rather than /opt/homebrew/Cellar/openmotif fixes this issue. Building motif from source is not necessary.