Okay, thanks for this. Rebuilding my -gretl- sorted this out:
clive@clivubu:~/gretl-git$ ls -l `which gretlcli`
-rwxr-xr-x 1 root root 127960 MarĀ 4 01:27 /usr/local/bin/gretlcli
clive@clivubu:~/gretl-git$ ls -l `which gretl_x11`
-rwxr-xr-x 1 root root 6170520 MarĀ 4 01:27 /usr/local/bin/gretl_x11
gretl version 2019b-git
Current session: 2019-03-04 01:30
? set verbose off
Forecast MSEs
Including fixed effects: mean 1.33638, sd 0.188603
Excluding fixed effects: mean 1.4624, sd 0.197409
memo: average p-value for fixed effects: 0.000124235
Whenever I eventually get around to re-making the YouTube demonstration video for downloading and installing -gretl- the 'hard' way (but don't hold your breath as only Jack is actively looking forward to seeing it), I'll be sure to incorporate these "ls -l" calls in bash as side-tips towards the end of the demo.
C