need help with a poudriere build error of the port math/maxima

[Robert Cina]

Hi, I need help with creating a patch for a poudriere build error I'm
experiencing for the port math/maxima using 12.1 stable amd64.

I have filed a bug #247805 for the issue and was told there is no
maintainer for this port and I should create a patch for it myself. The
only problem is I don't know where to start to debug the specific error in
question.

The error from the build log math/maxima is shown below:

-exec /bin/sh -c '\''cd '\''$2'\'' && chmod 755 "$@"'\'' . {} +  -o
-type f -exec /bin/sh -c '\''cd '\''$2'\'' && chmod 0644 "$@"'\'' . {}
+ \)' COPYTREE_SHARE .
/wrkdirs/usr/ports/math/maxima/work/stage/usr/local/share/examples/maxima
'-name *\.dem'
install  -m 444
/wrkdirs/usr/ports/math/maxima/work/maxima-5.44.0/doc/man/maxima.1.gz
/wrkdirs/usr/ports/math/maxima/work/stage/usr/local/man/man1
/bin/mkdir -p /wrkdirs/usr/ports/math/maxima/work/stage/usr/local/lib/ecl
install  -m 0644
/wrkdirs/usr/ports/math/maxima/work/maxima-5.44.0/src/binary-ecl/maxima.fas
 /wrkdirs/usr/ports/math/maxima/work/stage/usr/local/lib/ecl
install: /wrkdirs/usr/ports/math/maxima/work/maxima-5.44.0/src/binary-ecl/maxima.fas:
No such file or directory
*** Error code 71

Stop.
make: stopped in /usr/ports/math/maxima
=>> Cleaning up wrkdir
===>  Cleaning for maxima-5.44.0_1
build of math/maxima | maxima-5.44.0_1 ended at Sun Jul  5 17:38:17 EDT 2020
build time: 00:02:11
!!! build failure encountered !!!


This error occurs at the staging process and poudriere indicates it may be
a missing header but I am not really sure.  Any hints on where I should
look to solve the problem are greatly appreciated.

Thanks
Rob