Hi Allan,
Yes, this commit works, after using:

ninja -t clean
./configure && ninja


Allan Odgaard wrote:

On 16 Dec 2017, at 0:07, Angelo Varlotta wrote:

I've tried changing _erbout << "</ol>\n" to _erbout.concat("</ol>\n") but I still get the same error. I'm on macOS 10.13.2 with Xcode 9.2.

Please try compile HEAD which includes this commit: https://github.com/textmate/textmate/commit/0c8817e57aa35aa95472fc66a4489f764c997ffd