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Add alpine linux instructions to readme

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Alpine's uses musl rather than libc and does not have support for `pthread_getname_np`. Therefore it must be build with `WITH_PTHREAD_NP=false`.
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Ayrton Sparling 2022-04-21 10:34:25 -07:00 committed by GitHub
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@ -40,6 +40,7 @@ You'll need ```make```, ```gcc```, ```libevent``` with ```pthreads``` support,
* Arch: `sudo pacman -S libevent libjpeg-turbo libutil-linux libbsd`.
* Raspbian: `sudo apt install libevent-dev libjpeg8-dev libbsd-dev`. Add `libgpiod-dev` for `WITH_GPIO=1` and `libsystemd-dev` for `WITH_SYSTEMD=1`.
* Debian/Ubuntu: `sudo apt install build-essential libevent-dev libjpeg-dev libbsd-dev`.
* Alpine: `sudo apk add libevent-dev libbsd-dev libjpeg-turbo-dev musl-dev`. Build with `WITH_PTHREAD_NP=false`.
To enable GPIO support install [libgpiod](https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/about) and pass option ```WITH_GPIO=1```. If the compiler reports about a missing function ```pthread_get_name_np()``` (or similar), add option ```WITH_PTHREAD_NP=0``` (it's enabled by default). For the similar error with ```setproctitle()``` add option ```WITH_SETPROCTITLE=0```.