Fix for caller_dir relative gems

1 files changed, 6 insertions, 2 deletions

diff --git a/tasks/mruby_build_gem.rake b/tasks/mruby_build_gem.rake
index 4b8b79682..ea1307132 100644
--- a/tasks/mruby_build_gem.rake
+++ b/tasks/mruby_build_gem.rake
@@ -8,17 +8,21 @@ module MRuby
       GemBox.path = gembox
 
       instance_eval File.read(gembox)
+
+      GemBox.path = nil
     end
 
     def gem(gemdir, &block)
       caller_dir = File.expand_path(File.dirname(/^(.*?):\d/.match(caller.first).to_a[1]))
+
       if gemdir.is_a?(Hash)
         gemdir = load_special_path_gem(gemdir)
-      elsif gemdir.is_a?(String)
-        gemdir = "#{File.dirname(GemBox.path)}/#{gemdir}"
+      elsif GemBox.path && gemdir.is_a?(String)
+        gemdir = File.expand_path(gemdir, File.dirname(GemBox.path))
       else
         gemdir = File.expand_path(gemdir, caller_dir)
       end
+
       gemrake = File.join(gemdir, "mrbgem.rake")
 
       fail "Can't find #{gemrake}" unless File.exists?(gemrake)