pip install -r requirements.txt failing with multiple errors.

Nobody has claimed this yet.

Trying to install xsshunter_client on Lubuntu 19.10, but the command 'pip install -r requirements.txt' is failing with multiple errors. Sorry, I really don't know much about this particular stuph. I've cited errors below but I don't know what is really relevant, that's why I've posted the whole thing at https://pastebin.com/c33hk0qQ[](https://pastebin.com/c33hk0qQ), but here is the error at the end of it:

> ERROR: Command errored out with exit status 1: /home/t0p/dev/env/bin/python2 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-2yueHP/cffi/setup.py'"'"'; __file__='"'"'/tmp/pip-install-2yueHP/cffi/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-YkFoRV/install-record.txt --single-version-externally-managed --compile --install-headers /home/t0p/dev/env/include/site/python2.7/cffi Check the logs for full command output.

It failed to build cffi cryptography lxml and Pillow.

The cffi error is this I think:
```
creating build/temp.linux-x86_64-2.7/c
x86_64-linux-gnu-gcc -pthread -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fdebug-prefix-map=/build/python2.7-8kFkPd/python2.7-2.7.17=. -fstack-protector-strong -Wformat -Werror=format-security -fPIC -DUSE__THREAD -I/usr/include/ffi -I/usr/include/libffi -I/usr/include/python2.7 -c c/_cffi_backend.c -o build/temp.linux-x86_64-2.7/c/_cffi_backend.o
c/_cffi_backend.c:2:10: fatal error: Python.h: No such file or directory
2 | #include
| ^~~~~~~~~~
compilation terminated.
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
----------------------------------------
ERROR: Failed building wheel for cffi
```
cryptography error:
```
running build_ext
generating cffi module 'build/temp.linux-x86_64-2.7/_padding.c'
creating build/temp.linux-x86_64-2.7
generating cffi module 'build/temp.linux-x86_64-2.7/_constant_time.c'
generating cffi module 'build/temp.linux-x86_64-2.7/_openssl.c'
building '_openssl' extension
creating build/temp.linux-x86_64-2.7/build
creating build/temp.linux-x86_64-2.7/build/temp.linux-x86_64-2.7
x86_64-linux-gnu-gcc -pthread -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fdebug-prefix-map=/build/python2.7-8kFkPd/python2.7-2.7.17=. -fstack-protector-strong -Wformat -Werror=format-security -fPIC -I/usr/include/python2.7 -c build/temp.linux-x86_64-2.7/_openssl.c -o build/temp.linux-x86_64-2.7/build/temp.linux-x86_64-2.7/_openssl.o
build/temp.linux-x86_64-2.7/_openssl.c:22:12: fatal error: pyconfig.h: No such file or directory
22 | # include
| ^~~~~~~~~~~~
compilation terminated.
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
----------------------------------------
ERROR: Failed building wheel for cryptography
```

Pillow error:
```
copying PIL/OleFileIO-README.md -> build/lib.linux-x86_64-2.7/PIL
running build_ext
Traceback (most recent call last):
File "", line 1, in
File "/tmp/pip-install-2yueHP/Pillow/setup.py", line 767, in
zip_safe=not debug_build(),
File "/home/t0p/dev/env/local/lib/python2.7/site-packages/setuptools/__init__.py", line 145, in setup
return distutils.core.setup(**attrs)
File "/usr/lib/python2.7/distutils/core.py", line 151, in setup
dist.run_commands()
File "/usr/lib/python2.7/distutils/dist.py", line 953, in run_commands
self.run_command(cmd)
File "/usr/lib/python2.7/distutils/dist.py", line 972, in run_command
cmd_obj.run()
File "/home/t0p/dev/env/local/lib/python2.7/site-packages/wheel/bdist_wheel.py", line 192, in run
self.run_command('build')
File "/usr/lib/python2.7/distutils/cmd.py", line 326, in run_command
self.distribution.run_command(command)
File "/usr/lib/python2.7/distutils/dist.py", line 972, in run_command
cmd_obj.run()
File "/usr/lib/python2.7/distutils/command/build.py", line 128, in run
self.run_command(cmd_name)
File "/usr/lib/python2.7/distutils/cmd.py", line 326, in run_command
self.distribution.run_command(command)
File "/usr/lib/python2.7/distutils/dist.py", line 972, in run_command
cmd_obj.run()
File "/usr/lib/python2.7/distutils/command/build_ext.py", line 340, in run
self.build_extensions()
File "/tmp/pip-install-2yueHP/Pillow/setup.py", line 515, in build_extensions
% (f, f))
ValueError: --enable-jpeg requested but jpeg not found, aborting.
----------------------------------------
ERROR: Failed building wheel for Pillow

```
Any idea what I can do to build xsshunter_client? And are there any other clients out there, or is it this or bust?

Cheers.

The report points to requirements.txt and the pip install -r requirements.txt entry point; reproduce it in the reported Python 2.7/Lubuntu environment and inspect the cffi, cryptography, lxml, and Pillow build errors. Done means dependency installation completes and xsshunter_client can be built, or the supported setup and failure cause are documented.

Written by the indexing model from the issue text.