Installation from briefkasten on Debian 10

[sebastian2012]

Hi!
I Have a Vserver from Hetzner with Debian 10 Minimal. I Have cloned the git-Repo and copied the etc.sample/plain.conf to etc/ploy.conf.
Then I have changed the IP Line, ansible-fqdn and the approot_url.
after this I executed make bootstrap
Know I get the following error-Message:
(...)
/root/briefkasten/deployment/venv/log/develop-1.log)', 1)
ERROR: develop: could not install deps [pip >= 19.1.1, setuptools >= 31.0.0, a
(...)
In the develop-1.log file:
checking for gcc... gcc
checking whether the C compiler works... no
configure: error: in /tmp/pip-install-4e1mm3/pycrypto': configure: error: C compiler cannot create executables See config.log' for more details
Traceback (most recent call last):
(...)
RuntimeError: autoconf error
----------------------------------------
ERROR: Command errored out with exit status 1: /root/briefkasten/deployment/venv/bin/python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-4e1mm3/pycrypto/setup.py'"'"'; file='"'"'/tmp/pip-install-4e1mm3/pycrypto/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(file);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, file, '"'"'exec'"'"'))' install --record /tmp/pip-record-bj8j8L/install-record.txt --single-version-externally-managed --compile --install-headers /root/briefkasten/deployment/venv/include/site/python2.7/pycrypto Check the logs for full command output.
gcc is installed.
I have a debian Minimal-Installation ... are some Packages missing? ... :-)