After building OCaml 3.11.2 from source on Cygwin 1.72 I tried running ocamlbrowser and got the error:
Fatal error: exception Protocol.TkError("Can't find a usable init.tcl in the following directories:
C:/cygwin/share/tcl8.4
C:/cygwin/home/rettkeg/ocaml/build/ocaml-3.11.2/share/tcl8.4
C:/cygwin/home/rettkeg/ocaml/build/ocaml-3.11.2/usr/share/tcl8.4
C:/cygwin/home/rettkeg/o
The solution is can be found here:
export TCL_LIBRARY=/usr/share/tcl8.4