1) the SRC_URI didn't work for me; what did work is replacing the IP address 128.122.80.210 with the corresponding hostname (CIMS.NYU.EDU) 2) the openfst ebuild installed only a single header file (fst.h), but more of them seem to be required (specifically, ocropus looks for {arc,compat,properties,register,symbol-table,util}.h)
Version bumped to 20080422 and patched. Thanks for the report. I also fixed broken compilation on gcc-4.3. I am still not sure though, if all the required headers are installed since it does not seem to be documented anywhere.