Description:
------------
Tru64 UNIX 4.0D doesn't have vsnprintf(). So, the following code in Zend/zend.c is built:
  strncpy(z_error_message->value.str.val, va_arg(format,
  char *), ZEND_ERROR_BUFFER_SIZE);

Unfortunately, va_arg() in <varargs.h> on Tru64 UNIX expects the first argument ("format" in this case) to be of type struct va_list. Hence the error:
  cc: Error: /opt/build/php-4.3.2/Zend/zend.c, line 763: In this statement, "(format)" has a pointer type, but occurs in 
a context that requires a union or struct. (needstruct)
                   strncpy(z_error_message->value.str.val, va_arg(format, char *), ZEND_ERROR_BUFFER_SIZE);
----------------------------------------------------------------^
gmake: *** [Zend/zend.lo] Error 1

In <va_list.h>, va_list is defined as:
  typedef struct {
        char    **_a0;           
        int     _offset;                 
  } va_list;

I checked out CVS head and replaced the offending 4.3.2 Zend/zend.c code with CVS Zend/zend.c and it built ok. Is that the proper solution?