Added tips for giving blocks to `MRuby::Build#gem`
ref.
@@ -77,6 +77,21 @@ resolve version conflicts. If the version as specified in the gem's
rakefile is incompatible with a dependency, your build will still
fail.
+### Tweak the gem in your build configuration file
+
+You can give blocks in the `conf.gem` call to make adjustments for
+environments where the original gem does not expect them:
+
+```ruby
+conf.gem core: "mruby-bin-mirb" do |g|
+ # For cross build to NetBSD
+ g.linker.libraries = %w(edit termcap)
+end
+```
+
+However, it should be used with caution, as it may deviate from the intent
+of the gem's author.
+
## GemBox
There are instances when you wish to add a collection of mrbgems into mruby at
