In the last commit to remind, double quotes were replaced by single quotes.
This change disabled the parameter expansion for remind,
causing an error when starting tkremind:
Error in startup script: can't read "out": no such variable
while executing
"set Remind "$out/bin/remind""
(file "/nix/store/p2ha6a4ybw7m6cy8mindb15ay9129kfa-remind-05.00.02/bin/.tkremind-wrapped" line 216)
Reverting to double quotes allows Bash to correctly expand the $out parameter.
a326e13ecd