How to install rpi.gpio module for python?

Code:
building 'RPi.GPIO' extension



creating build/temp.linux-armv6l-2.7



creating build/temp.linux-armv6l-2.7/source



gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/python2.7 -c source/py_gpio.c -o build/temp.linux-armv6l-2.7/source/py_gpio.o



In file included from /usr/include/limits.h:27:0,



                 from /usr/lib/gcc/arm-linux-gnueabihf/4.6/include-fixed/limits.h:169,



                 from /usr/lib/gcc/arm-linux-gnueabihf/4.6/include-fixed/syslimits.h:7,



                 from /usr/lib/gcc/arm-linux-gnueabihf/4.6/include-fixed/limits.h:34,



                 from /usr/include/python2.7/Python.h:19,



                 from source/py_gpio.c:23:



/usr/include/features.h:356:25: fatal error: sys/cdefs.h: No such file or directory



compilation terminated.



error: command 'gcc' failed with exit status 1



----------------------------------------

Command /usr/bin/python -c "import setuptools;__file__='/build/rpi.gpio/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --single-version-externally-managed --record /tmp/pip-CRXER_-record/install-record.txt failed with error code 1 in /build/rpi.gpio

Storing complete log in /root/.pip/pip.log