Invoking `mergemaster` fails with the error message `Unknown modifier 't'`. Error messages of such low quality should not be shown to the user. He_she needs to know what went wrong (in which file, etc.) and how to get starting fixing the issue. The complete output of the failing command is:
*** The directory specified for the temporary root environment,
/var/tmp/temproot, exists. This can be a security risk if untrusted
users have access to the system.
Use 'd' to delete the old /var/tmp/temproot and continue
Use 't' to select a new temporary root directory
Use 'e' to exit mergemaster
Default is to use /var/tmp/temproot as is
How should I deal with this? [Use the existing /var/tmp/temproot]
*** Leaving /var/tmp/temproot intact
*** Creating the temporary root environment in /var/tmp/temproot
*** /var/tmp/temproot ready for use
*** Creating and populating directory structure in /var/tmp/temproot
Unknown modifier 't'
Syntax error: Unterminated quoted string
*** FATAL ERROR: Cannot 'cd' to /usr/src and install files to
the temproot environment
Please provide output of 'uname -aUK'