The debug command line option does not actually take an argument.
Muscle memory from 10+ years ago had me launch pidgin with options '-dn', but this fails with an error:
$ ./build/pidgin/pidgin3 -dn
Missing argument for -d
Testing Done:
Launch with -d - see debug output and enabled accounts log in
Launch without -d - see no debug output (after realising DEBUG also needed to be undefined) and enabled accounts log in
Launch with -dn - see debug outout and no accounts log in
Reviewed at https://reviews.imfreedom.org/r/1393/