Unable to install requirements on Slackware15

[karlstevens]

I'm running Slackware15 (Python 3.9) and get the following error when running pip install -r requirements.txt

I'm not sure what I'm looking at - could the dependency be broken?

/tmp/stag$ pip install -r requirements.txt 
Looking in indexes: https://pypi.org/simple, https://download.pytorch.org/whl/cpu, https://download.pytorch.org/whl/cpu, https://download.pytorch.org/whl/cpu
Collecting ram@ git+https://github.com/xinyu1205/recognize-anything.git@88c2b0ca13e38cca6655f83ad0185271167dbcbf
  Cloning https://github.com/xinyu1205/recognize-anything.git (to revision 88c2b0ca13e38cca6655f83ad0185271167dbcbf) to /tmp/pip-install-stj1_1tj/ram_422303f5f3af47ee8d107dd77e6ed5f0
  Running command git clone --filter=blob:none --quiet https://github.com/xinyu1205/recognize-anything.git /tmp/pip-install-stj1_1tj/ram_422303f5f3af47ee8d107dd77e6ed5f0
  Running command git rev-parse -q --verify 'sha^88c2b0ca13e38cca6655f83ad0185271167dbcbf'
  Running command git fetch -q https://github.com/xinyu1205/recognize-anything.git 88c2b0ca13e38cca6655f83ad0185271167dbcbf
  Running command git checkout -q 88c2b0ca13e38cca6655f83ad0185271167dbcbf
  Resolved https://github.com/xinyu1205/recognize-anything.git to commit 88c2b0ca13e38cca6655f83ad0185271167dbcbf
  Preparing metadata (setup.py) ... error
  error: subprocess-exited-with-error
  
  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [41 lines of output]
      Traceback (most recent call last):
        File "/tmp/stag/stag_env/lib64/python3.9/site-packages/pkg_resources/_vendor/packaging/requirements.py", line 98, in __init__
          req = REQUIREMENT.parseString(requirement_string)
        File "/tmp/stag/stag_env/lib64/python3.9/site-packages/pkg_resources/_vendor/pyparsing.py", line 1654, in parseString
          raise exc
        File "/tmp/stag/stag_env/lib64/python3.9/site-packages/pkg_resources/_vendor/pyparsing.py", line 1644, in parseString
          loc, tokens = self._parse( instring, 0 )
        File "/tmp/stag/stag_env/lib64/python3.9/site-packages/pkg_resources/_vendor/pyparsing.py", line 1402, in _parseNoCache
          loc,tokens = self.parseImpl( instring, preloc, doActions )
        File "/tmp/stag/stag_env/lib64/python3.9/site-packages/pkg_resources/_vendor/pyparsing.py", line 3417, in parseImpl
          loc, exprtokens = e._parse( instring, loc, doActions )
        File "/tmp/stag/stag_env/lib64/python3.9/site-packages/pkg_resources/_vendor/pyparsing.py", line 1406, in _parseNoCache
          loc,tokens = self.parseImpl( instring, preloc, doActions )
        File "/tmp/stag/stag_env/lib64/python3.9/site-packages/pkg_resources/_vendor/pyparsing.py", line 3205, in parseImpl
          raise ParseException(instring, loc, self.errmsg, self)
      pkg_resources._vendor.pyparsing.ParseException: Expected stringEnd (at char 4), (line:1, col:5)
      
      During handling of the above exception, another exception occurred:
      
      Traceback (most recent call last):
        File "<string>", line 2, in <module>
        File "<pip-setuptools-caller>", line 34, in <module>
        File "/tmp/pip-install-stj1_1tj/ram_422303f5f3af47ee8d107dd77e6ed5f0/setup.py", line 2, in <module>
          setuptools.setup()
        File "/tmp/stag/stag_env/lib64/python3.9/site-packages/setuptools/__init__.py", line 152, in setup
          _install_setup_requires(attrs)
        File "/tmp/stag/stag_env/lib64/python3.9/site-packages/setuptools/__init__.py", line 145, in _install_setup_requires
          dist.parse_config_files(ignore_option_errors=True)
        File "/tmp/stag/stag_env/lib64/python3.9/site-packages/setuptools/dist.py", line 801, in parse_config_files
          self._finalize_requires()
        File "/tmp/stag/stag_env/lib64/python3.9/site-packages/setuptools/dist.py", line 528, in _finalize_requires
          self._move_install_requirements_markers()
        File "/tmp/stag/stag_env/lib64/python3.9/site-packages/setuptools/dist.py", line 567, in _move_install_requirements_markers
          inst_reqs = list(pkg_resources.parse_requirements(spec_inst_reqs))
        File "/tmp/stag/stag_env/lib64/python3.9/site-packages/pkg_resources/__init__.py", line 3084, in parse_requirements
          yield Requirement(line)
        File "/tmp/stag/stag_env/lib64/python3.9/site-packages/pkg_resources/__init__.py", line 3094, in __init__
          super(Requirement, self).__init__(requirement_string)
        File "/tmp/stag/stag_env/lib64/python3.9/site-packages/pkg_resources/_vendor/packaging/requirements.py", line 100, in __init__
          raise InvalidRequirement(
      pkg_resources.extern.packaging.requirements.InvalidRequirement: Parse error at "': requir'": Expected stringEnd
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed