OS: Solaris 10 (sparc)
CC: gcc-4.7.2

In compilation ntbtls-0.1.1, the following errors appears:

protocol.c:241:3: error: 'FASTWIPE_T' undeclared (first use in this function)

FASTWIPE_T is used in src/wipemem.h but is not defined anywhere.
The macro using FASTWIPE_T seems to be the same in g10lib.h of libgcrypt-1.7.7.
So, I put the definition FASTWIPE_T in src/wipemem.h according to g10lib.h:

 typedef unsigned long long u64;
# define FASTWIPE_T u64

This works fine on my machine.