6704968: OpenJDK Build README is missing ant requirement
6704973: OpenJDK Build readme needs cygwin package list improvements
6590549: Cygwin build of OpenJDK has problems and not very well documented
6462815: cygwin's gnumake 3.81-1 does not support MS-DOS path names
6597857: JDK build instructions need to be updated (BUILD_JDK_IMPORT_PATH, BUILD_BINARY_PLUGS_PATH)
Reviewed-by: jjg, igor