Hello Howard.
You have a bad installation or upgrade of TinyOS. When you installed a rpm did
you get two lines from 0 to 100%? If only you got one, the packet did not
install.
Did you configure de environment variable? Check with the command tos-check-env
if you get tos-check-env completing without errors.
Maybe is better to delete your previous installation. You can delete cygwin
manually, but you must delete two keys in the register (init->execute->regedit)
manually: HKEY_CURRENT_USER\Software\Cygnus Solutions and
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions. Delete the folder.
I hope that help you.
A greeting,
Juan Antonio.
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