Default make to build dox conditional on doxygen being available. #6

	name: Example

	on:
	push:
	paths:
	- 'examples/**'
	- '.github/workflows/example.yml'

	jobs:

	build:
	name: Check examples

	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: Compile example.c
	run: \|
	cd examples
	gcc -c -Wall -Werror -I ../include example.c

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