Php Compile Errors

Tru64 5.1B, PK6, Php 5.2.8

I am hitting a lot of errors similar to:

cc: Error: /usr/users/install/php-5.2.8/ext/pcre/pcrelib/pcre_internal.h, line 
1143: In this declaration, "BOOL" appears to be used as if it named a type, but 
there is no declared type of that name visible. (typedefnotdef)
extern BOOL         _pcre_was_newline(const uschar *, int, const uschar *,
-------^
cc: Error: /usr/users/install/php-5.2.8/ext/pcre/pcrelib/pcre_internal.h, line 
1145: In this declaration, "BOOL" appears to be used as if it named a type, but 
there is no declared type of that name visible. (typedefnotdef)
extern BOOL         _pcre_xclass(int, const uschar *);

Because this machine only has 1G of memory, I am unable to compile gcc from 
source but downloaded the GnuPro toolkit from HP but am still getting the same 
errors even with configure including the header files for gcc (that were provided).

Any pointers would be greatly appreciated -- we need php and the module for apache.