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Merge wip/133-macos-build: portable signal/socket helpers, XQuartz dr… #364

Job	Run time
Parsers and dialogs (no build, no display)	15m 2s
GUI apps (build, install, Xvfb)	15m 2s
End-to-end (real code, real monitor, real parsers)	15m 2s
	45m 6s