Have some legacy code in a header file that is causing much pain..

#ifndef __BIT_TYPES_DEFINED__
#define __BIT_TYPES_DEFINED__
@u_int8_decl@
@int16_decl@
@u_int16_decl@
@int32_decl@
@u_int32_decl@
#endif

I get this error:
error C2018: unknown character '0x40'
error C2501: 'u_int8_decl' : missing storage-class or type specifiers
fatal error C1004: unexpected end of file found
What is this first of all? How do fix this or tweak the project settings
to remedy this? Anyone know??