diff --git a/lib/redmine/scm/adapters/mercurial_adapter.rb b/lib/redmine/scm/adapters/mercurial_adapter.rb
--- a/lib/redmine/scm/adapters/mercurial_adapter.rb
+++ b/lib/redmine/scm/adapters/mercurial_adapter.rb
@@ -29,6 +29,14 @@
         TEMPLATE_EXTENSION = "tmpl"
         
         class << self
+
+          def shellout(cmd, &block)
+            orig_lang = ENV['LANG']
+            ENV['LANG'] = 'C'
+            super(cmd, &block)
+            ENV['LANG'] = orig_lang
+          end
+
           def client_version
             @@client_version ||= (hgversion || [])
           end
@@ -44,7 +52,18 @@
           end
           
           def hgversion_from_command_line
-            %x{#{HG_BIN} --version}.match(/\(version (.*)\)/)[1]
+              # %x{#{HG_BIN} --version}.match(/\(version (.*)\)/)[1]
+              ver = ""
+              cmd = "#{HG_BIN} --version"
+              shellout(cmd) do |io|
+                str = io.gets.chomp
+                if ( str =~ /version/ )
+                  ver = str.match(/\(version (.*)\)/)[1]
+                  break
+                end
+              end
+              return "" if $? && $?.exitstatus != 0
+              ver
           end
           
           def template_path