In the FVWM 2.6.5 manual page for FvwmM4 in the section OPTIONS,
it states
-debug Causes the temporary file created by m4 to be retained.
This file is usually called "/tmp/fvwmrcXXXXXX"
It would be extremely helpful to add to the manual page that if the
environment variable for temporary directory is set, then the file will
be created in that directory and not /tmp, eg
TMPDIR="/var/tmp/miller"
ll $TMPDIR/fvwmrc*
32 -rw------- 1 miller users 28872 2013-06-09 04:42
/var/tmp/miller/fvwmrcLsWuTT
236 -rw------- 1 miller users 239550 2013-06-10 19:09
/var/tmp/miller/fvwmrcRzgHdC
32 -rw------- 1 miller users 28872 2013-06-09 04:40
/var/tmp/miller/fvwmrctBI7Ys
236 -rw------- 1 miller users 239550 2013-06-10 19:11
/var/tmp/miller/fvwmrcy0rzAz
