Add `--no-brew` option

Used to skip Homebrew on OS X, also some extconf cleanup

1 files changed, 2 insertions, 1 deletions

diff --git a/Rakefile b/Rakefile
index 623f7e4..df44733 100644
--- a/Rakefile
+++ b/Rakefile
@@ -23,7 +23,8 @@ task :build do
   system "gem build ruby2d.gemspec --verbose"
   
   puts "==> install gem"
-  system "gem install ruby2d-#{Ruby2D::VERSION}.gem --local --verbose"
+  system "gem install ruby2d-#{Ruby2D::VERSION}.gem "\
+         "--local --verbose -- --no-brew"
 end
 
 desc "Run testcard"