running build_ext
skipping 'numpytest.c' Cython extension (up-to-date)
building 'numpytest' extension
gcc -pthread -fno-strict-aliasing -march=i686 -mtune=generic -O2 -pipe -DNDEBUG -march=i686 -mtune=generic -O2 -pipe -fPIC -I/usr/include/python2.7 -c numpytest.c -o build/temp.linux-i686-2.7/numpytest.o
numpytest.c:221:31: fatal error: numpy/arrayobject.h: No such file or directory
compilation terminated.
error: command 'gcc' failed with exit status 1