I'm using Mercurial 5.4.1 (installed with HomeBrew) on Mac OSX 10.14.6 and I using SourceTree v4.0.1 and I can't get SourceTree to connect to /usr/local/bin/hg using Preferences->Mercurial->Use System Mercurial because the hg executable is grayed out and can't be selected.
Why?
I also ran into this.
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