Subshell in the Midnight commander doesn't work with FreeBSD's
stock csh, since MC thinks, that it doesn't Tcsh.
The patch, I've added, allows using subshell even if user's
shell set to /bin/csh.
NOTE: additional file files/patch-src-subshell.c was added.
The copy of the message was sent to maintainier.
Over to maintainer
The PR has been closed long time ago.