97 #  define OS_CODE  0x00  macro
114 #  define OS_CODE  1  macro
118 #  define OS_CODE  2  macro
125 #    define OS_CODE 4  macro
127 #    define OS_CODE 11  macro
129 #    define OS_CODE 8  macro
134 #  define OS_CODE  5  macro
138 #  define OS_CODE  6  macro
145 #  define OS_CODE  7  macro
149 #  define OS_CODE 13  macro
153 #  define OS_CODE  10  macro
157 #  define OS_CODE  16  macro
161 #  define OS_CODE 18  macro
165 #  define OS_CODE 19  macro
184 #  define OS_CODE  3     /* assume Unix */  macro