Change default gem path.

Rakefile

@@ -9,10 +9,8 @@ load "#{MRUBY_ROOT}/tasks/mruby_build.rake"
 load "#{MRUBY_ROOT}/tasks/mrbgem_spec.rake"
 
 # load configuration file
-MRUBY_CONFIGS = ["#{MRUBY_ROOT}/build_config.rb", ENV['MRUBY_CONFIG']].compact
-MRUBY_CONFIGS.each do |config|
-  load config unless config.empty?
-end
+MRUBY_CONFIG = (ENV['MRUBY_CONFIG'] && ENV['MRUBY_CONFIG'] != '') ? ENV['MRUBY_CONFIG'] : "#{MRUBY_ROOT}/build_config.rb"
+load MRUBY_CONFIG
 
 # load basic rules
 MRuby.each_target do |build|

build_config.rb

@@ -12,22 +12,22 @@ MRuby::Build.new do |conf|
   # conf.gem :git => 'git@github.com:masuidrive/mrbgems-example.git', :branch => 'master', :options => '-v'
 
   # Use standard Math module
-  conf.gem 'mrbgems/mruby-math'
+  conf.gem "#{root}/mrbgems/mruby-math"
 
   # Use standard Time class
-  conf.gem 'mrbgems/mruby-time'
+  conf.gem "#{root}/mrbgems/mruby-time"
 
   # Use standard Struct class
-  conf.gem 'mrbgems/mruby-struct'
+  conf.gem "#{root}/mrbgems/mruby-struct"
 
   # Use standard Kernel#sprintf method
-  conf.gem 'mrbgems/mruby-sprintf'
+  conf.gem "#{root}/mrbgems/mruby-sprintf"
 
   # Use extensional String class
-  conf.gem 'mrbgems/mruby-string-ext'
+  conf.gem "#{root}/mrbgems/mruby-string-ext"
 
   # Use extensional Numeric class
-  conf.gem 'mrbgems/mruby-numeric-ext'
+  conf.gem "#{root}/mrbgems/mruby-numeric-ext"
 
   # Generate binaries
   # conf.bins = %w(mrbc mruby mirb)

tasks/mrbgems.rake

@@ -9,7 +9,7 @@ MRuby.each_target do
     # loader all gems
     self.libmruby << objfile("#{build_dir}/mrbgems/gem_init")
     file objfile("#{build_dir}/mrbgems/gem_init") => "#{build_dir}/mrbgems/gem_init.c"
-    file "#{build_dir}/mrbgems/gem_init.c" => MRUBY_CONFIGS.flatten do |t|
+    file "#{build_dir}/mrbgems/gem_init.c" => [MRUBY_CONFIG] do |t|
       FileUtils.mkdir_p "#{build_dir}/mrbgems"
       open(t.name, 'w') do |f|
         f.puts %Q[/*]

tasks/mruby_build_gem.rake

 module MRuby
   module LoadGems
     def gem(gemdir, &block)
-      gemdir = load_external_gem(gemdir) if gemdir.is_a?(Hash)
+      caller_dir = File.expand_path(File.dirname(/^(.*?):\d/.match(caller.first).to_a[1]))
+      if gemdir.is_a?(Hash)
+        gemdir = load_external_gem(gemdir)
+      else
+        gemdir = File.expand_path(gemdir, caller_dir)
+      end
       gemrake = File.join(gemdir, "mrbgem.rake")
 
       fail "Can't find #{gemrake}" unless File.exists?(gemrake)