The name `modification_time' does not exist in the context of `G'

[shaqaruden]

I am attempting to build this on macOS Catalina but I am running into these errors when running doit or build.py

libbirdfont/BackupTab.vala:174.25-174.43: error: The name modification_time' does not exist in the context ofG' return Posix.strcmp (b.modification_time, a.modification_time); // descending ^^^^^^^^^^^^^^^^^^^ libbirdfont/BackupTab.vala:174.46-174.64: error: The name modification_time' does not exist in the context ofG' return Posix.strcmp (b.modification_time, a.modification_time); // descending