Can't read documentation in pow, launched form fv: Error: can't read "env(POW_HELPDIR)": no such variable

[Neal McBurnett]

I'm launching the pow tool from fv version 5.5, installed via apt on Ubuntu 20.04. It is part of HEASoft's FITS software suite.

I click on the menu Help/About and I get this error message:

Error: can't read "env(POW_HELPDIR)": no such variable

After poking around a bit, I see that I can set this in Bash before running fv:

export POW_HELPDIR=/usr/share/doc/ftools-pow

which fixes it and lets me browse the help documentation.

This connection to the pow documentation should be enabled internally somehow.

Thanks!