I get this error while installing some packages with pip3 inside an environment

using centOS 7 with python 3.7.2 as parallel install.
step to reproduce: (dependancies are installed)

rm -rf /usr/local/lib/python3.7
cd /root/
wget https://www.python.org/ftp/python/3.7.2/Python-3.7.2.tgz
tar -xzf Python-3.7.2.tgz
cd Python-3.7.2
./configure --prefix=/usr/local --enable-shared --enable-optimizations LDFLAGS="-Wl,-rpath /usr/local/lib"
make
make altinstall

adduser a-user

su - a-user
/usr/local/lib/python3.7 -m venv user-envn
source user-envn/bin/activate

pi3 install --upgrade pip
pip install pyusb==1.0.0

result with error:

Collecting pyusb==1.0.0
  Using cached https://files.pythonhosted.org/packages/8a/19/66fb48a4905e472f5dfeda3a1bafac369fbf6d6fc5cf55b780864962652d/PyUSB-1.0.0.tar.gz
    Complete output from command python setup.py egg_info:
    running egg_info
    creating pip-egg-info/pyusb.egg-info
    writing pip-egg-info/pyusb.egg-info/PKG-INFO
    writing dependency_links to pip-egg-info/pyusb.egg-info/dependency_links.txt
    writing top-level names to pip-egg-info/pyusb.egg-info/top_level.txt
    writing manifest file 'pip-egg-info/pyusb.egg-info/SOURCES.txt'
    error: [Errno 13] Permission denied: '/usr/local/lib/python3.7/lib2to3/Grammar3.7.2.final.0.pickle'

please help how to solve this