我正在Debian 6使用以下命令python 2.7进行安装scrapy（根据文档）：
pip install Scrapy
并得到了这个错误
gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/python2.7 -c twisted/runner/portmap.c -o build/temp.linux-x86_64-2.7/twisted/runner/portmap.o
twisted/runner/portmap.c:10:20: error: Python.h: No such file or directory
twisted/runner/portmap.c:14: error: expected '=', ',', ';', 'asm' or '__attribute__' before '*' token
twisted/runner/portmap.c:31: error: expected '=', ',', ';', 'asm' or '__attribute__' before '*' token
twisted/runner/portmap.c:45: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'PortmapMethods'
twisted/runner/portmap.c: In function 'initportmap':
twisted/runner/portmap.c:55: warning: implicit declaration of function 'Py_InitModule'
twisted/runner/portmap.c:55: error: 'PortmapMethods' undeclared (first use in this function)
twisted/runner/portmap.c:55: error: (Each undeclared identifier is reported only once
twisted/runner/portmap.c:55: error: for each function it appears in.)
error: command 'gcc' failed with exit status 1
----------------------------------------
Cleaning up...
Command /usr/bin/python -c "import setuptools;__file__='/tmp/pip_build_root/Twisted/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-FSl8pj-record/install-record.txt --single-version-externally-managed failed with error code 1 in /tmp/pip_build_root/Twisted
Storing complete log in /root/.pip/pip.log
我认为问题出在安装Twisted库时，所以我尝试使用以下方法单独安装它：
pip install Twisted
并得到同样的错误。
我怎样才能解决这个问题 ？