fiona pip install problem

[smrgeoinfo]

in my Anaconda COGS environment, when I run
(COGS) C:\Users\smrTu>pip install fiona

this is the output:

Collecting fiona
  Using cached Fiona-1.8.21.tar.gz (1.0 MB)
  Preparing metadata (setup.py) ... error
  error: subprocess-exited-with-error

  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [1 lines of output]
      A GDAL API version must be specified. Provide a path to gdal-config using a GDAL_CONFIG environment variable or use a GDAL_VERSION environment variable.
      [end of output]

Looks like some GDAL_ environmental variables need to be set.