buildRubyGem: handle build-time ruby dependencies

For some reason `gem install` unsets the GEM_PATH environment variable
internally unless the install dir is provided. This in turn means that
if it invokes extconf.rb and extconf.rb depends on a gem available on
the GEM_PATH (like pkg-config for nokogiri) then it's not available in
that context.

Proof: d8293c4729/lib/rubygems/commands/install_command.rb (L151)
Blame: 9ea600c9c2

This is a hack that sets the :install_dir to where we would install
anyways (the GEM_HOME is the default installation destination).
This commit is contained in:
zimbatm 2016-08-29 22:12:44 +01:00
parent b046ebbb7c
commit a7cf555e2a

View file

@ -181,6 +181,7 @@ stdenv.mkDerivation (attrs // {
--force \
--http-proxy 'http://nodtd.invalid' \
--ignore-dependencies \
--install-dir "$GEM_HOME" \
--build-root '/' \
--backtrace \
${documentFlag} \