The TCL_PACKAGE_PATH variable is set to <em>with braces</em>.

<pre>
  $ sudo make install
  ...
  -c -d
  -c tcltls.so
  -c -m 644    pkgIndex.tcl
</pre>

As this is not valid brace expansion (comma is required), that results in creating a directory called <code>{</code> and installing the files under it, instead of