When I run nmake.exe from make I get this error:

Microsoft (R) Program Maintenance Utility Version 8.00.50727.42
Copyright (C) Microsoft Corporation.  All rights reserved.

NMAKE : fatal error U1065: invalid option '-'

But I'm not passing in '-' as an option anyplace.

If I run the same command from outside of make it works correctly.

windows makefile nmake
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