Setup configuration fails (debian)

[PeterGhimself]

First hurdle encountered after initially running: sudo python ./setup.py install

output:

[...]
Installed /usr/local/lib/python2.7/dist-packages/sjcam-1.0-py2.7.egg
Processing dependencies for sjcam==1.0
Searching for lxml
Reading https://pypi.python.org/simple/lxml/
Best match: lxml 4.2.5
Downloading https://files.pythonhosted.org/packages/4b/20/ddf5eb3bd5c57582d2b4652b4bbcf8da301bdfe5d805cb94e805f4d7464d/lxml-4.2.5.tar.gz#sha256=36720698c29e7a9626a0dc802ef8885f8f0239bfd1689628ecd459a061f2807f
Processing lxml-4.2.5.tar.gz
Writing /tmp/easy_install-cACsIA/lxml-4.2.5/setup.cfg
Running lxml-4.2.5/setup.py -q bdist_egg --dist-dir /tmp/easy_install-cACsIA/lxml-4.2.5/egg-dist-tmp-yVehX0
Building lxml version 4.2.5.
Building without Cython.
ERROR: /bin/sh: 1: xslt-config: not found

** make sure the development packages of libxml2 and libxslt are installed **

Using build configuration of libxslt 
In file included from src/lxml/etree.c:662:0:
src/lxml/includes/etree_defs.h:14:31: fatal error: libxml/xmlversion.h: No such file or directory
compilation terminated.
Compile failed: command 'x86_64-linux-gnu-gcc' failed with exit status 1
/tmp/easy_install-cACsIA/lxml-4.2.5/temp/xmlXPathInitHw2meW.c:2:1: warning: return type defaults to ‘int’ [-Wimplicit-int]
 main (int argc, char **argv) {
 ^
error: Setup script exited with error: command 'x86_64-linux-gnu-gcc' failed with exit status 1

The following installation solved this issue:
sudo apt-get install python-dev libxml2-dev libxslt1-dev zlib1g-dev

However, after the setup script is done setting up, I tried running some of the commands to test the API functionality but get the following errors:

(venv) peter@boop-Latitude-E6420:~/Documents/Programming/sjcam$ sjcam config
/home/peter/.local/lib/python2.7/site-packages/requests/__init__.py:91: RequestsDependencyWarning: urllib3 (1.23) or chardet (2.3.0) doesn't match a supported version!
  RequestsDependencyWarning)
/home/peter/.local/lib/python2.7/site-packages/requests/__init__.py:83: RequestsDependencyWarning: Old version of cryptography ([1, 2, 3]) may cause slowdown.
  warnings.warn(warning, RequestsDependencyWarning)

  Camera config:
    Failed! Couldn't read config!

I tried deactivating the virtual environment but still got the same error messages.