Call "undocumented" NTDLL functions with Cygwin/gcc?

[David Arnstein]

I would like to use some of the "undocumented" NTDLL functions from
within a C or C++ program. I would like to compile this program from
Cygwin's C or C++ compiler.

The functions I refer to involve Registry operations, such as 
NtQueryValueKey() and NtEnumerateValueKey(). I found some sparse
documentation here:
http://undocumented.ntinternals.net/UserMode/Undocumented%20Functions/NT%20Objects/Key/NtQueryValueKey.html

I could not find these under /usr/include. Any suggestions?

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