fix cmake issue #13

	name: C/C++ CI

	on:
	push:

	jobs:
	build:

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v1
	- name: check the environment
	run: g++ --version && git --version && bash --version
	- name: list the environment
	run: ls -la
	- name: build with bash
	run: bash bash_build.sh
	- name: run tests
	run: \|
	pushd build
	./test_pt_os
	popd

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