diff --git a/ChangeLog b/ChangeLog
index eb0245a5dc..b382b207b2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,14 @@
+Sat Dec  1 01:21:07 2012  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* lib/rubygems/command.rb (Gem::Command#get_all_gem_names_and_versions):
+	  who assumes that the pathname of a gem never contains ':' ?
+	  yes, on Unixen pathnames can contain ':', and on Windows they almost
+	  certainly contain ':'.  see [ruby-core:50388].
+
+	* lib/rubygems/requirement.rb (Gem::Requirement::PATTERN_RAW): extract
+	  the regexp to match the version specifier from PATTERN to use in
+	  above method.
+
 Sat Dec  1 00:48:19 2012  Naohisa Goto  <ngotogenome@gmail.com>
 
 	* ext/fiddle/extconf.rb, ext/fiddle/function.c
diff --git a/lib/rubygems/command.rb b/lib/rubygems/command.rb
index 69cbf3c269..cba79b9196 100644
--- a/lib/rubygems/command.rb
+++ b/lib/rubygems/command.rb
@@ -5,6 +5,7 @@
 #++
 
 require 'optparse'
+require 'rubygems/requirement'
 require 'rubygems/user_interaction'
 
 ##
@@ -186,7 +187,13 @@ class Gem::Command
   # An argument in the form gem:ver is pull apart into the gen name and version,
   # respectively.
   def get_all_gem_names_and_versions
-    get_all_gem_names.map { |name| name.split(":", 2) }
+    get_all_gem_names.map do |name|
+      if /\A(.*):(#{Gem::Requirement::PATTERN_RAW})\z/ =~ name
+        [$1, $2]
+      else
+        [name]
+      end
+    end
   end
 
   ##
diff --git a/lib/rubygems/requirement.rb b/lib/rubygems/requirement.rb
index b80e8dca19..ed768924a8 100644
--- a/lib/rubygems/requirement.rb
+++ b/lib/rubygems/requirement.rb
@@ -27,7 +27,8 @@ class Gem::Requirement
   }
 
   quoted  = OPS.keys.map { |k| Regexp.quote k }.join "|"
-  PATTERN = /\A\s*(#{quoted})?\s*(#{Gem::Version::VERSION_PATTERN})\s*\z/
+  PATTERN_RAW = "\\s*(#{quoted})?\\s*(#{Gem::Version::VERSION_PATTERN})\\s*"
+  PATTERN = /\A#{PATTERN_RAW}\z/
 
   DefaultRequirement = [">=", Gem::Version.new(0)]
 
diff --git a/test/rubygems/test_gem_commands_install_command.rb b/test/rubygems/test_gem_commands_install_command.rb
index 6a3293e356..28b4e474ba 100644
--- a/test/rubygems/test_gem_commands_install_command.rb
+++ b/test/rubygems/test_gem_commands_install_command.rb
@@ -664,7 +664,7 @@ ERROR:  Possible alternatives: non_existent_with_hint
     assert_equal 0, e.exit_code
   end
 
-  def test_execute_satisify_deps_of_local_from_sources
+  def test_execute_satisfy_deps_of_local_from_sources
     r, r_gem = util_gem 'r', '1', 'q' => '= 1'
     q, q_gem = util_gem 'q', '1'