I tested just with pycurl in one line and removed/re-added container and in the log I get this error now…so I guess some progress but still throws error 
Collecting pycurl
Downloading pycurl-7.43.0.5.tar.gz (216 kB)
ERROR: Command errored out with exit status 1:command: /usr/local/bin/python -c ‘import sys, setuptools, tokenize; sys.argv[0] = ‘"’"’/tmp/pip-install-y9w2q9v7/pycurl/setup.py’“'”‘; file=’“'”‘/tmp/pip-install-y9w2q9v7/pycurl/setup.py’“'”‘;f=getattr(tokenize, ‘"’“‘open’”’“‘, open)(file);code=f.read().replace(’”‘"’\r\n’“'”‘, ‘"’"’\n’“'”‘);f.close();exec(compile(code, file, ‘"’“‘exec’”’"‘))’ egg_info --egg-base /tmp/pip-install-y9w2q9v7/pycurl/pip-egg-info
cwd: /tmp/pip-install-y9w2q9v7/pycurl/
Complete output (22 lines):
Traceback (most recent call last):
File “/tmp/pip-install-y9w2q9v7/pycurl/setup.py”, line 233, in configure_unix
p = subprocess.Popen((self.curl_config(), ‘–version’),File “/usr/local/lib/python3.8/subprocess.py”, line 854, in init
self._execute_child(args, executable, preexec_fn, close_fds,
File “/usr/local/lib/python3.8/subprocess.py”, line 1702, in _execute_child
raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: ‘curl-config’During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File “”, line 1, in
File “/tmp/pip-install-y9w2q9v7/pycurl/setup.py”, line 961, in
ext = get_extension(sys.argv, split_extension_source=split_extension_source)
File “/tmp/pip-install-y9w2q9v7/pycurl/setup.py”, line 623, in get_extension
ext_config = ExtensionConfiguration(argv)
File “/tmp/pip-install-y9w2q9v7/pycurl/setup.py”, line 101, in init
self.configure()
File “/tmp/pip-install-y9w2q9v7/pycurl/setup.py”, line 238, in configure_unix
raise ConfigurationError(msg)
main.ConfigurationError: Could not run curl-config: [Errno 2] No such file or directory: ‘curl-config’ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
Thanks.