Build failure (openpty)

I followed the steps for doing a build, and managed to build pfSense successfully once (the embedded image) using the steps provided. I haven't made any changes, but I tried to build it again a couple days later by doing build_embedded. It skips the build, as its supposed to, and then on the installworld step I fail with the error "script: openpty: No such file or directory", followed by "Something went wrong, check errors!". At that point I tried doing an update with cvsup_current, and I get the same error right after the Building world for i386 architecture step. Has anyone seen this before? It says it saved a log, but the log is empty. I searched on line, and I found some old posts for something being wrong with altq-vlan.diff, but that seems to have been fixed and updated. Any ideas on what I should try next to get this built?