Im trying to compile z/lib on z/OS USS(thats right a mainframe). ive got gmake and the c89 compiler (which im assuming is c89 standards compliant) and USS is supposed to be POSIX compliant. 

But zlib seems to be tripping up on

```
struct internal_state FAR *state; /* not visible by applications */

```

with the following error(s)

```
c89 -O3 -DUSE_MMAP -D_XOPEN_SOURCE_EXTENDED=1 -D_POSIX_SOURCE   -c -o example.o example.c
ERROR CCN3277 ./zlib.h:92    Syntax error: possible missing ';' or ','?
ERROR CCN3007 ./zlib.h:92    "struct internal_state" is undefined.
ERROR CCN3166 ./zlib.h:103   Definition of function FAR requires parentheses.
ERROR CCN3276 ./zlib.h:103   Syntax error: possible missing '{'?
ERROR CCN3273 ./zlib.h:124   Missing type in declaration of gz_header.
ERROR CCN3166 ./zlib.h:126   Definition of function gz_header requires parentheses.
ERROR CCN3276 ./zlib.h:126   Syntax error: possible missing '{'?
WARNING CCN3137 ./zlib.h:1346  Declaration must declare at least one declarator, tag, or the members of an enumeration.
ERROR CCN3275 ./zlib.h:1350  Unexpected text z encountered.
ERROR CCN3282 ./zlib.h:1350  The type of the parameters must be specified in a prototype.
ERROR CCN3275 ./example.c:95    Unexpected text file encountered.
ERROR CCN3045 ./example.c:95    Undeclared identifier gzFile.
ERROR CCN3046 ./example.c:96    Syntax error.
ERROR CCN3045 ./example.c:98    Undeclared identifier file.
ERROR CCN3019 ./example.c:523   Expecting an array or a pointer to object type.
ERROR CCN3280 ./example.c:527   Function argument assignment between types "const char*" and "int" is not allowed.
CCN0793(I) Compilation failed for file ./example.c.  Object file not created.
FSUM3065 The COMPILE step ended with return code 12.
FSUM3017 Could not compile example.c. Correct the errors and try again.
gmake: *** [example.o] Error 3

```

when i progressively take out the FAR \* (i think its a far pointer but im really not that sure) the errors go away. But as this is a library, im not sure what other artifacts are going to be produced by removing this.

has anybody got any ideas?

any old mainframe heads out there?