Building Ruby gems with MacPorts Ruby

Andreas Yankopolus andreas at
Sun Jan 2 18:48:54 UTC 2022


I’ve installed Ruby with sudo port install ruby31 and want to install middleman <> with sudo gem install middleman. This gives an error that header files for building gems are not present in /opt/local/lib/ruby3.1/include:

Building native extensions. This could take a while...
ERROR:  Error installing middleman:
	ERROR: Failed to build gem native extension.

    current directory: /opt/local/lib/ruby3.1/gems/3.1.0/gems/ffi-1.15.4/ext/ffi_c
/opt/local/bin/ruby3.1 -I /opt/local/lib/ruby3.1/3.1.0 -r ./siteconf20220102-15848-cuiju7.rb extconf.rb
mkmf.rb can't find header files for ruby at /opt/local/lib/ruby3.1/include/ruby.h

You might have to install separate package for the ruby development
environment, ruby-dev or ruby-devel for example.

extconf failed, exit code 1

Gem files will remain installed in /opt/local/lib/ruby3.1/gems/3.1.0/gems/ffi-1.15.4 for inspection.
Results logged to /opt/local/lib/ruby3.1/gems/3.1.0/extensions/arm64-darwin-21/3.1.0/ffi-1.15.4/gem_make.out

What MacPorts package(s) do I need for installing these headers? I’ve had no luck searching on <> for ruby.h


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