System Tcl packages are not found in tclsh $auto_path

[phil-blain]

Issue: system Tcl packages are not found in the default search path inside the conda-installed tclsh

Environment (conda list):

$ conda list
...
tk                        8.6.10               hbbe82c9_0    conda-forge
...

Details about conda and system ( conda info ):

$ conda info
     active environment : cice
    active env location : /Users/Philippe/Logiciels/miniconda3/envs/cice
            shell level : 1
       user config file : /Users/Philippe/.condarc
 populated config files : /Users/Philippe/.condarc
          conda version : 4.8.2
    conda-build version : 3.18.11
         python version : 3.7.6.final.0
       virtual packages : __osx=10.11.6
       base environment : /Users/Philippe/Logiciels/miniconda3  (writable)
           channel URLs : https://conda.anaconda.org/conda-forge/osx-64
                          https://conda.anaconda.org/conda-forge/noarch
                          https://repo.anaconda.com/pkgs/main/osx-64
                          https://repo.anaconda.com/pkgs/main/noarch
                          https://repo.anaconda.com/pkgs/r/osx-64
                          https://repo.anaconda.com/pkgs/r/noarch
          package cache : /Users/Philippe/Logiciels/miniconda3/pkgs
                          /Users/Philippe/.conda/pkgs
       envs directories : /Users/Philippe/Logiciels/miniconda3/envs
                          /Users/Philippe/.conda/envs
               platform : osx-64
             user-agent : conda/4.8.2 requests/2.22.0 CPython/3.7.6 Darwin/15.6.0 OSX/10.11.6
                UID:GID : 502:20
             netrc file : None
           offline mode : False

I don't know the first thing about Tcl, but I noticed the following, on macOS 10.11:

# no active conda environment
$ tclsh
% puts $auto_path
/System/Library/Frameworks/Tcl.framework/Versions/8.5/Resources/Scripts 
/System/Library/Frameworks/Tcl.framework/Versions/8.5/Resources /usr/lib ~/Library/Tcl 
/Library/Tcl /System/Library/Tcl /System/Library/Tcl/8.5 ~/Library/Frameworks 
/Library/Frameworks /System/Library/Frameworks
% exit

$ conda activate cice
$ tclsh
% puts $auto_path
/Users/Philippe/Logiciels/miniconda3/envs/cice/lib/tcl8.6 
/Users/Philippe/Logiciels/miniconda3/envs/cice/lib

This means that inside the environment, Tcl packages installed in the system directories are not found... is this desired behaviour ?