本人打算在windows 7下，使用octopress搭建博客。

有一个问题不得其解：
cmd终端，使用chcp 65001, rake generate编译没有问题。

但是，用git bash终端，已经设置了变量如下：
LC_ALL=en_US.UTF-8
LANG=en_US.UTF-8
LESSCHARSET=utf-8

rake generate产生下面问题：

octopress/plugins/backtick_code_block.rb:13:in gsub': incompat ible character encodings: UTF-8 and GBK (Encoding::CompatibilityError) from octopress/plugins/backtick_code_block.rb:13:inre nder_code_block'
from octopress/plugins/octopress_filters.rb:12:in pre_ filter' from octopress/plugins/octopress_filters.rb:28:inpre_ render'
from octopress/plugins/post_filters.rb:112:in block in pre_render' from octopress/plugins/post_filters.rb:111:ineach'
from octopress/plugins/post_filters.rb:111:in pre_rend er' from octopress/plugins/post_filters.rb:166:indo_layou t'
from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/jekyll-0.12.0/lib/jekyll/po
st.rb:195:in render' from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/jekyll-0.12.0/lib/jekyll/si te.rb:200:inblock in render'
from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/jekyll-0.12.0/lib/jekyll/si
te.rb:199:in each' from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/jekyll-0.12.0/lib/jekyll/si te.rb:199:inrender'
from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/jekyll-0.12.0/lib/jekyll/si
te.rb:41:in process' from c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/jekyll-0.12.0/bin/jekyll:26 4:in'
from c:/Ruby200-x64/bin/jekyll:23:in load' from c:/Ruby200-x64/bin/jekyll:23:in

'

有谁可以帮忙分析一下，是怎么回事，git bash有等价cmd终端的chcp类似命令吗？

补充说明：
在当前git bash终端下，输入中文是没有问题的；同时中文问题只是发生在代码高亮模块里，其他位置的中文是没有这个情况的，如果不需要代码高亮，也是没有这个问题。