I think I found the problem. (Just read fbrun source code, but rest will probably work the same). Execl is used to start the program using "$SHELL -c myprogram". This cannot work because I use zsh and output of my $SHELL is zsh - which of course cannot be found by execl (needs full path).
Setting shell in my screenrc to /bin/zsh worked around that problem. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org