@JKSH The branch I've been copying from didn't include some of the folders that were present in the 'Resources' section. Shouldn't have taken me this long to figure it out. Thank you.
You did a complete rebuild as well?
The run of qmake does not create an error code, but it does not introduce a moc statement into makefile.
I guess you are using a shadow for compiling. Delete the whole shadow folder, rerun qmake once again and rebuild.
If you think it imay be a bug related to Qt 5.5 you can check on JIRA.