You added -since but documented -msince in the man page. If you were also to add
{ "-newerat", N_ASINCE, c_asince, 1 }, /* gnu find
compat */
{ "-newerct", N_CSINCE, c_csince, 1 },
{ "-newermt", N_SINCE, c_since, 1 }, /* ung */
in the appropriate place, you'd have something that was command line
compatible with gnu findutils, so scripts written for that find, which
only use facilities actually implemented here, would work.
Would that really be such an evil thing?
kre
