problem installing geneweb

[Alan Curtis]

--->  Building geneweb with target all
Error: Target com.apple.build returned: shell command " cd "/opt/ 
local/var/db/dports/build/ 
_opt_local_var_db_dports_sources_rsync.rsync.darwinports.org_dpupdate_dp 
orts_genealogy_geneweb/work/geneweb-4.10" && make all " returned error 2
Command output: cd wserver; make opt
camlp4r pa_ifdef.cmo -DUNIX -loc loc -o wserver.ppi wserver.mli
Camlp4: Uncaught exception: DynLoader.Error ("pa_ifdef.cmo", "file  
not found in path")

make[1]: *** [wserver.cmi] Error 2
make: *** [opt] Error 2

Error: Status 1 encountered during processing.


Any suggestions?