Failed to compile due to unsupported platform aarch64-alpine-linux-musl (on Apple M1 with docker)

[ronaldtse]

I'm trying to install the emf2svg gem on a Alpine Linux container (on Apple M1 with docker) but ran into this problem:

Is it possible not to validate against a platform?

#19 145.2 Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
#19 145.2 
#19 145.2     current directory: /usr/local/bundle/gems/emf2svg-1.2.0/ext
#19 145.2 /usr/local/bin/ruby -I /usr/local/lib/ruby/3.1.0 -r
#19 145.2 ./siteconf20220322-7-c161ro.rb extconf.rb
Downloading libemf2svg.tar.gz (  0%) 
#19 145.2 Extracting libemf2svg.tar.gz into /tmp/d20220322-2173-5vxh37... DEBUG: env is {}
#19 145.2 DEBUG: command is ["tar", "zxf",
#19 145.2 "/usr/local/bundle/gems/emf2svg-1.2.0/ports/archives/libemf2svg.tar.gz", "-C",
#19 145.2 "/tmp/d20220322-2173-5vxh37"]
#19 145.2 DEBUG: options are {[:out, :err]=>["/tmp/d20220322-2173-5vxh37/extract.log",
#19 145.2 "a"]}
#19 145.2 OK
#19 145.2 /usr/local/bundle/gems/emf2svg-1.2.0/lib/emf2svg/recipe.rb:52:in
#19 145.2 `host_platform': CrossRuby.platform: unsupported host: aarch64-alpine-linux-musl
#19 145.2 (RuntimeError)
#19 145.2 from /usr/local/bundle/gems/emf2svg-1.2.0/lib/emf2svg/recipe.rb:63:in
#19 145.2 `cross_compiling?'
#19 145.2 from /usr/local/bundle/gems/emf2svg-1.2.0/lib/emf2svg/recipe.rb:75:in
#19 145.2 `configure_defaults'
#19 145.2 from
#19 145.2 /usr/local/bundle/gems/mini_portile2-2.6.1/lib/mini_portile2/mini_portile.rb:118:in
#19 145.2 `configure_options'
#19 145.2 from
#19 145.2 /usr/local/bundle/gems/mini_portile2-2.6.1/lib/mini_portile2/mini_portile.rb:257:in
#19 145.2 `computed_options'
#19 145.2 from
#19 145.2 /usr/local/bundle/gems/mini_portile2-2.6.1/lib/mini_portile2/mini_portile_cmake.rb:33:in
#19 145.2 `configured?'
#19 145.2 from
#19 145.2 /usr/local/bundle/gems/mini_portile2-2.6.1/lib/mini_portile2/mini_portile.rb:179:in
#19 145.2 `cook'
#19 145.2 	from /usr/local/bundle/gems/emf2svg-1.2.0/lib/emf2svg/recipe.rb:27:in `cook'
#19 145.2 	from extconf.rb:6:in `<main>'
#19 145.2 
#19 145.2 extconf failed, exit code 1

The Dockerfile:

FROM ruby:3.1.1-alpine
USER root
RUN apk update && apk upgrade
RUN apk add curl unzip bash make tzdata coreutils git coreutils \
  gcc g++ musl-dev cmake \
  libxml2 libxml2-dev libxslt libxslt-dev libsass libsass-dev sassc
RUN gem install bundler
RUN gem install emf2svg

Relevant code:

emf2svg-ruby/lib/emf2svg/recipe.rb

Lines 34 to 54 in 4875932

	def host_platform
	@host_platform ||=
	case @host
	when /\Ax86_64.*mingw32/
	"x64-mingw32"
	when /\Ai[3-6]86.*mingw32/
	"x86-mingw32"
	when /\Ax86_64.*linux/
	"x86_64-linux"
	when /\Aarm64.*linux/
	"xarm64-linux"
	when /\Ai[3-6]86.*linux/
	"x86-linux"
	when /\Ax86_64.*darwin/
	"x86_64-darwin"
	when /\Aarm64.*darwin/
	"arm64-darwin"
	else
	raise "CrossRuby.platform: unsupported host: #{@host}"
	end
	end