在ubuntu 14.04上安装Scrapy失败

我在我的ubuntu盒子上安装Scrapy时遇到错误.我正在使用pip来安装Scrapy.我知道它需要安装setuptools.我使用setuptools网站提供的脚本安装了它.

reading manifest file 'Twisted.egg-info/SOURCES.txt'

writing manifest file 'Twisted.egg-info/SOURCES.txt'

creating build/lib.linux-x86_64-2.7/twisted/internet/iocpreactor/iocpsupport

copying twisted/internet/iocpreactor/iocpsupport/iocpsupport.c -> build/lib.linux-x86_64-2.7/twisted/internet/iocpreactor/iocpsupport

copying twisted/internet/iocpreactor/iocpsupport/winsock_pointers.c -> build/lib.linux-x86_64-2.7/twisted/internet/iocpreactor/iocpsupport

copying twisted/test/raiser.c -> build/lib.linux-x86_64-2.7/twisted/test

copying twisted/runner/portmap.c -> build/lib.linux-x86_64-2.7/twisted/runner

copying twisted/python/sendmsg.c -> build/lib.linux-x86_64-2.7/twisted/python

running build_ext

x86_64-linux-gnu-gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/python2.7 -c conftest.c -o conftest.o

building 'twisted.runner.portmap' extension

creating build/temp.linux-x86_64-2.7

creating build/temp.linux-x86_64-2.7/twisted

creating build/temp.linux-x86_64-2.7/twisted/runner

x86_64-linux-gnu-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: fatal error: Python.h: No such file or directory

 #include 

                    ^

compilation terminated.

error: command 'x86_64-linux-gnu-gcc' failed with exit status 1

----------------------------------------
Cleaning up...
Command /usr/bin/python -c "import setuptools, tokenize;__file__='/tmp/pip_build_root/Twisted/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-4QNuNV-record/install-record.txt --single-version-externally-managed --compile failed with error code 1 in /tmp/pip_build_root/Twisted
Storing debug log for failure in /root/.pip/pip.log

任何过程出错的想法？我已经安装了gcc和g ++.