さくらサーバで、pip3 install numpyでインストールエラー

前提・実現したいこと

さくらレンタルサーバを（スタンダード）使用しています。
https://bty.sakura.ne.jp/wp/archives/1470
こちらを参考にヴァージョンのみ3.8.1に書き換えて
Python3.8.1インストールしました。

順調に環境をpip3でインストールして
% pip3 list
Package Version

certifi 2019.11.28
chardet 3.0.4
Cython 0.29.14
idna 2.8
pip 19.3.1
requests 2.22.0
setuptools 41.2.0
urllib3 1.25.7
%
現在このような状態です

次に
pip3 install numpy　でインストールが出来ず次のエラーになります。

ImportError: /var/tmp/pip-build-env-lgbpj4ca/overlay/lib/python3.8/site-packages/Cython/Compiler/Scanning.so: mmap of data failed: Permission denied

エラー全文>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

ERROR: Command errored out with exit status 1:
command: /home/hogehoge/local/python/bin/python3.8 /home/hogehoge/local/python/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py prepare_metadata_for_build_wheel /tmp/tmp08yk6aao
cwd: /var/tmp/pip-install-orlg244f/numpy
Complete output (50 lines):
Traceback (most recent call last):
File "/home/hogehoge/local/python/lib/python3.8/runpy.py", line 193, in _run_module_as_main
return _run_code(code, main_globals, None,
File "/home/hogehoge/local/python/lib/python3.8/runpy.py", line 86, in _run_code
exec(code, run_globals)
File "/var/tmp/pip-build-env-lgbpj4ca/overlay/lib/python3.8/site-packages/cython.py", line 16, in <module>
from Cython.Compiler.Main import main
File "/var/tmp/pip-build-env-lgbpj4ca/overlay/lib/python3.8/site-packages/Cython/Compiler/Main.py", line 28, in <module>
from .Scanning import PyrexScanner, FileSourceDescriptor
ImportError: /var/tmp/pip-build-env-lgbpj4ca/overlay/lib/python3.8/site-packages/Cython/Compiler/Scanning.so: mmap of data failed: Permission denied
Processing numpy/random/_bounded_integers.pxd.in
Processing numpy/random/_mt19937.pyx
Traceback (most recent call last):
File "/var/tmp/pip-install-orlg244f/numpy/tools/cythonize.py", line 238, in <module>
main()
File "/var/tmp/pip-install-orlg244f/numpy/tools/cythonize.py", line 234, in main
find_process_files(root_dir)
File "/var/tmp/pip-install-orlg244f/numpy/tools/cythonize.py", line 225, in find_process_files
process(root_dir, fromfile, tofile, function, hash_db)
File "/var/tmp/pip-install-orlg244f/numpy/tools/cythonize.py", line 191, in process
processor_function(fromfile, tofile)
File "/var/tmp/pip-install-orlg244f/numpy/tools/cythonize.py", line 80, in process_pyx
subprocess.check_call(
File "/home/hogehoge/local/python/lib/python3.8/subprocess.py", line 364, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['/home/hogehoge/local/python/bin/python3.8', '-m', 'cython', '-3', '--fast-fail', '-o', '_mt19937.c', '_mt19937.pyx']' returned non-zero exit status 1.
Running from numpy source directory.
setup.py:425: UserWarning: Unrecognized setuptools command, proceeding with generating Cython sources and expanding templates
run_build = parse_setuppy_commands()
Cythonizing sources
Traceback (most recent call last):
File "/home/hogehoge/local/python/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py", line 257, in <module>
main()
File "/home/hogehoge/local/python/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py", line 240, in main
json_out['return_val'] = hook(**hook_input['kwargs'])
File "/home/hogehoge/local/python/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py", line 110, in prepare_metadata_for_build_wheel
return hook(metadata_directory, config_settings)
File "/var/tmp/pip-build-env-lgbpj4ca/overlay/lib/python3.8/site-packages/setuptools/build_meta.py", line 156, in prepare_metadata_for_build_wheel
self.run_setup()
File "/var/tmp/pip-build-env-lgbpj4ca/overlay/lib/python3.8/site-packages/setuptools/build_meta.py", line 236, in run_setup
super(_BuildMetaLegacyBackend,
File "/var/tmp/pip-build-env-lgbpj4ca/overlay/lib/python3.8/site-packages/setuptools/build_meta.py", line 142, in run_setup
exec(compile(code, file, 'exec'), locals())
File "setup.py", line 450, in <module>
setup_package()
File "setup.py", line 433, in setup_package
generate_cython()
File "setup.py", line 240, in generate_cython
raise RuntimeError("Running cythonize failed!")
RuntimeError: Running cythonize failed!
----------------------------------------
ERROR: Command errored out with exit status 1: /home/hogehoge/local/python/bin/python3.8 /home/hogehoge/local/python/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py prepare_metadata_for_build_wheel /tmp/tmp08yk6aao Check the logs for full command output.