:) https://metacpan.org/source/VKON/Tcl-1.02/Tcl.xs 

    dl_path = SvPV_nolen(get_sv("Tcl::DL_PATH", TRUE));
    if (dl_path && *dl_path) {
    handle = dlopen(dl_path, RTLD_NOW | RTLD_GLOBAL);

[download]

In reply to Re^2: Link Tcl to a different tcl.dll on Windows by Anonymous Monk
in thread Link Tcl to a different tcl.dll on Windows by Takamoto

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