Update configure with autoconf. #61

	name: Mac CI

	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]

	jobs:
	build:

	runs-on: macos-latest

	steps:
	- uses: actions/checkout@v2
	- name: Build dependencies
	# Building tcl to make sure we get tclInt.h
	run: \|
	sudo mkdir -p /usr/local/src/git
	sudo chown `id -un` /usr/local/src/git
	cd /usr/local/src/git
	git clone https://github.com/tcltk/tcl.git
	cd tcl
	git checkout core-8-6-branch
	cd unix
	./configure
	make
	sudo make install
	- name: configure
	run: \|
	autoreconf -vi
	./configure --with-tcl=/usr/local/lib --prefix=/usr/local
	- name: make
	run: make
	- name: test
	# These tests fail on Mac only in the Github Actions containers, and this
	# cannot be reproduced in a workable test environment. It may be related to
	# the general signal handling issues with multithreaded TclX. Try re-enabling
	# when on Tcl(x) 8.7 where the problem should be fixed.
	continue-on-error: true
	run: SKIPFILES="pipe.test process.test signal.test" make test
	- name: install
	run: sudo make install

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