openbsd 5.1 : error: command 'cc' failed with exit status 1

[ANTHONY-HESNAUX]

/tmp/psutil-4.3.0# python setup.py install
running install
running bdist_egg
running egg_info
writing psutil.egg-info/PKG-INFO
writing top-level names to psutil.egg-info/top_level.txt
writing dependency_links to psutil.egg-info/dependency_links.txt
reading manifest file 'psutil.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no previously-included files matching '*' found under directory 'docs/_build'
writing manifest file 'psutil.egg-info/SOURCES.txt'
installing library code to build/bdist.openbsd-5.1-i386/egg
running install_lib
running build_py
running build_ext
building 'psutil._psutil_bsd' extension
cc -pthread -fno-strict-aliasing -O2 -pipe -DNDEBUG -O2 -pipe -DTHREAD_STACK_SIZE=0x20000 -fPIC -fPIC -DPSUTIL_VERSION=430 -I/usr/local/include/python2.7 -c psutil/_psutil_bsd.c -o build/temp.openbsd-5.1-i386-2.7/psutil/_psutil_bsd.o
psutil/_psutil_bsd.c: In function 'psutil_proc_open_files':
psutil/_psutil_bsd.c:570: error: invalid use of undefined type 'struct kinfo_file'
psutil/_psutil_bsd.c:570: error: dereferencing pointer to incomplete type
psutil/_psutil_bsd.c:577: error: dereferencing pointer to incomplete type
psutil/_psutil_bsd.c:578: error: dereferencing pointer to incomplete type
psutil/_psutil_bsd.c:580: error: dereferencing pointer to incomplete type
error: command 'cc' failed with exit status 1