New comment by kawaiiamber on void-packages repository

https://github.com/void-linux/void-packages/pull/27618#issuecomment-761544111

Comment:
I tried testing on aarch64-musl, and found that:
```
=> OpenCoarrays-2.9.2_1: building [cmake] for aarch64-musl...
   [host] gcc-fortran-9.3.0_9: found (https://alpha.de.repo.voidlinux.org/current/musl)
   [host] openmpi-4.1.0_1: found (https://alpha.de.repo.voidlinux.org/current/musl)
   [host] cmake-3.19.3_1: found (https://alpha.de.repo.voidlinux.org/current/musl)
   [target] libgfortran-devel-9.3.0_9: found (https://alpha.de.repo.voidlinux.org/current/aarch64)
   [target] openmpi-devel-4.1.0_1: not found
```
`openmpi` isn't on cross platform. I have an updated template here:
```
# Template file for 'OpenCoarrays'
pkgname=OpenCoarrays
version=2.9.2
revision=1
build_style=cmake
hostmakedepends="gcc-fortran openmpi"
makedepends="libgfortran-devel openmpi-devel"
short_desc="Parallel application binary interface for Fortran 2018 compilers"
maintainer="Alberto Ramos <alberto.ramos@ific.uv.es>"
license="BSD-3-Clause"
homepage="https://opencoarrays.org"
distfiles="https://github.com/sourceryinstitute/OpenCoarrays/archive/${version}.tar.gz"
checksum=a11639034ecc2445b6e5efa187ab4fac2b0b384ddae5872d62f717b40922d259
nocross="openmpi not available on cross build"
 
post_install() {
	vlicense LICENSE
}
```
This passes `xbps-src` locally on my x86_64-musl machine. The `hostmakedepends` and `makedepends` of the template I made could probably be cleaned up a bit, I don't know much about fortran, though.