APKBUILD examples:Ruby

gem is the standard way to install Ruby packages.

build() {
        mkdir -p "$_builddir" || return 1
        local _gemdir="$(ruby -rubygems -e'puts Gem.default_dir')"
        gem install $_realname -v $pkgver -i "$_builddir"$_gemdir \
		--ignore-dependencies --verbose \
		--no-rdoc \
		--no-ri \
		|| return 1
	rm -rf "$_builddir"$_gemdir/cache/
}

package() {
        mkdir -p "$pkgdir" || return 1
        cp -ra "$_builddir"/* "$pkgdir"/ || return 1
}