Problems with installation ns-2.31 under Cygwin

Reference:
[ 1393985 ] validation fails under Cygwin
http://mailman.isi.edu/pipermail/ns-users/2006-December/058117.html

Error Message:

validate overall report: some tests failed:
     ./test-all-smac-multihop ./test-all-simultaneous ./test-all-wireless-tdma
to re-run a specific test, cd tcl/test; ./test-all-TEST-NAME
Notice that some tests in webcache will fail on freebsd when -O is turned on.
This is due to some event reordering, which will disappear when -g is turned on.

Cygwin >= 1.3.19 detected (1.5.24), all tests should have passed.
Please see <http://www.isi.edu/nsnam/ns/ns-problems.html>
for potential solutions.

Solution:

Those tests currently fail on Cygwin.