These are the flags used by DMD. If you can point Mono-D to "gdmd" instead of "gdc" it might work. gdmd is a wrapper around gdc that convert dmd flags to gdc flags.
I cannot. GDMD toolchain is not even present among those in Mono-D.
OTOH, I still do not know how to pass -lortp regular flag to the toolchain, in order to link with that libortp.so library.
