Successfully defining png_int_16 in pngconf.h

I'm working with libpng and I am required to use it within a kernel
module. The problem is that pngconf.h tries to determine how to define
a 16-bit signed type by comparing preprocessor symbols to values like
this:

#if INT_MIN == -32768 && INT_MAX == 32767
/* Our 16-bit signed type is 'int', define stuff accordingly */
#endif

In linux/kernel.h INT_MAX is defined as ((int)((~0U>>1))

Thus the conditional involves the token 'int' which to the
preprocessor is just another symbol and the cast is just bad syntax
(to the preprocessor).

Does anyone have a suggestion for how to get pngconf.h to successfully compile?