#ifdef __CYGWIN__
	    pathv[pathc - 2] = installLib2;

This adding is useful for X:/cygwin/bin/tclsh.exe to
include "X:/cygwin/usr/share/tcl8.4", which is the
place on cygwin where to find init.tcl.

Unfortunately, it is of no help to:
 X:/cygwin/usr/local/pgsql/bin/pgtclsh.exe
 X:/cygwin/usr/local/pgsql/bin/postgres.exe
because it leads to:
 X:/cygwin/usr/local/pgsql/usr/share/tcl8.4

A way to solve this problem is to define the
TCL_LIBRARY environment variable.

I think that there is a better way to accommodate all
applications on cygwin, without the need to define
TCL_LIBRARY, by moving the use of installLib2 to
AppendDllPath().

As the dll is X:/cygwin/bin/tcl84.dll, AppendDllPath()
would return:
 X:/cygwin/usr/share/tcl8.4
whatever the application executable path is.

I don't have the means to compile/build/test the tcl
package from source, but my proposed patch generated
with:
 $ diff -u tclWinInit.c ../../../../tmp/tclWinInit.c
is attached.


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