mutt trying to use /var/tmp instead of /tmp for temporary files

[Fourhundred Thecat]

Hello,

I have recompiled mutt to disable gpg integration.

Now I have noticed one seemingly unrelated change:

Suddenly, mutt wants to use /var/tmp instead of /tmp for temporary
files. I have not changed anything in the sourcecode. I have only
disabled some compilation options. Now when I open any message in mutt,
I get:

Could not create temporary file!

and strace shows me it is trying to use /var/tmp/

any idea what happened?
How can I revert this back to using /tmp ?

thanks,