Installation Error

I tried to install apex using the command-

pip install -v --no-cache-dir --global-option="--cpp_ext" --global-option="--cuda_ext" ./

I get the following error-

/home/prithila/anaconda3/lib/python3.7/site-packages/pip/_internal/commands/install.py:244: UserWarning: Disabling all use of wheels due to the use of --build-option / --global-option / --install-option.
cmdoptions.check_install_build_global(options)
Non-user install because site-packages writeable
Created temporary directory: /tmp/pip-ephem-wheel-cache-70bolni2
Created temporary directory: /tmp/pip-req-tracker-7h40_c27
Initialized build tracking at /tmp/pip-req-tracker-7h40_c27
Created build tracker: /tmp/pip-req-tracker-7h40_c27
Entered build tracker: /tmp/pip-req-tracker-7h40_c27
Created temporary directory: /tmp/pip-install-8cnlrzsn
Cleaning up...
Removed build tracker: '/tmp/pip-req-tracker-7h40_c27'
ERROR: You must give at least one requirement to install (see "pip help install")
Exception information:
Traceback (most recent call last):
File "/home/prithila/anaconda3/lib/python3.7/site-packages/pip/_internal/cli/base_command.py", line 186, in _main
status = self.run(options, args)
File "/home/prithila/anaconda3/lib/python3.7/site-packages/pip/_internal/commands/install.py", line 301, in run
wheel_cache
File "/home/prithila/anaconda3/lib/python3.7/site-packages/pip/_internal/cli/req_command.py", line 292, in populate_requirement_set
'(see "pip help %(name)s")' % opts)
pip._internal.exceptions.CommandError: You must give at least one requirement to install (see "pip help install")
1 location(s) to search for versions of pip:

• https://pypi.org/simple/pip/
  Fetching project page and analyzing links: https://pypi.org/simple/pip/
  Getting page https://pypi.org/simple/pip/
  Found index url https://pypi.org/simple
  Getting credentials from keyring for https://pypi.org/simple
  Getting credentials from keyring for pypi.org
  Starting new HTTPS connection (1): pypi.org:443
  https://pypi.org:443 "GET /simple/pip/ HTTP/1.1" 200 13603
  Found link https://files.pythonhosted.org/packages/3d/9d/1e313763bdfb6a48977b65829c6ce2a43eaae29ea2f907c8bbef024a7219/pip-0.2.tar.gz#sha256=88bb8d029e1bf4acd0e04d300104b7440086f94cc1ce1c5c3c31e3293aee1f81 (from https://pypi.org/simple/pip/), version: 0.2
  Found link https://files.pythonhosted.org/packages/18/ad/c0fe6cdfe1643a19ef027c7168572dac6283b80a384ddf21b75b921877da/pip-0.2.1.tar.gz#sha256=83522005c1266cc2de97e65072ff7554ac0f30ad369c3b02ff3a764b962048da (from https://pypi.org/simple/pip/), version: 0.2.1
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  Given no hashes to check 139 links for project 'pip': discarding no candidates

Can anyone please help me solve this error?
Thanks!!!

Start by reproducing the reported pip installation command from the Apex repository and compare its arguments with the project's installation guidance. The issue does not mention a source file or test; done would mean identifying the installation failure's cause and documenting or correcting the relevant installation path.