ROMS/Utility/checkdefs.F
This seems to be a typo in checkdefs.F. The following change fixed the problem--compiles and runs OK:
$ diff ROMS/Utility/checkdefs.F.orig ROMS/Utility/checkdefs.F
2891c2891
< #if defined NEMURO && defined HOLLING_GRAZING && IVLEV_EXPLICIT
---
> #if defined NEMURO && defined HOLLING_GRAZING && defined IVLEV_EXPLICIT
--Tom