Sequent Dynix/Ptx 4.4.4 has only two elements in struct rusage.  my_init.c must have the extra elements protected with an #ifdef just as in microtime.c.   Here is the symptoms' compiler error display, followed by something nearly resembling a fix.  The semblance is near enough to solve the problem on my machine.  It is intended to retain the extended functionality on all other machines.

Making all in libmysql
     cc -DHAVE_CONFIG_H -I. -I/opt/php-4.0.0/ext/mysql/libmysql -I/opt/php-4.0.0 -I/opt/php-4.0.0/Zend -I/opt/php-4.0.0 -I/opt/php-4.0.0/ext/mysql/libmysql -I/opt/php-4.0.0/ext/xml/expat/xmltok -I/opt/php-4.0.0/ext/xml/expat/xmlparse -DXML_BYTE_ORDER=12 -Wc,+abi-socket -g  -c my_init.c && touch my_init.lo
"my_init.c", line 102: undefined struct/union member: ru_maxrss
"my_init.c", line 102: undefined struct/union member: ru_idrss
"my_init.c", line 103: undefined struct/union member: ru_minflt
"my_init.c", line 103: undefined struct/union member: ru_majflt
"my_init.c", line 104: undefined struct/union member: ru_nswap
"my_init.c", line 104: undefined struct/union member: ru_inblock
"my_init.c", line 104: undefined struct/union member: ru_oublock
"my_init.c", line 105: undefined struct/union member: ru_msgsnd
"my_init.c", line 105: undefined struct/union member: ru_msgrcv
"my_init.c", line 105: undefined struct/union member: ru_nsignals
"my_init.c", line 106: undefined struct/union member: ru_nvcsw
"my_init.c", line 106: undefined struct/union member: ru_nivcsw
*** Error code 1
Make: .  Stop.
*** Error code 1
Make: .  Stop.
*** Error code 1
Make: .  Stop.
*** Error code 1
Make: .  Stop.
*** Error code 1
Make: .  Stop.
% 

Ow.

Now for the fix.  This diff is against PHP 4.0.0 Release.  Observe the moved commas and closing pren. The minor spelling correction is included because I noticed it, not because I spell perfectly.  Note that not all C compilers join contiguous strings, as they ought, so this "fix" might break working code on some platforms.

% diff my_init.orig my_init.c
97c97,101
<       fprintf(info_file,"\nUser time %.2f, System time %.2f\nMaximum resident set size %d, Integral resident set size %d\nNon physical pagefaults %d, Physical pagefaults %d, Swaps %d\nBlocks in %d out %d, Messages in %d out %d, Signals %d\nVouluntary context switches %d, Invouluntary context switches %d\n",
---
>       fprintf(info_file,"\nUser time %.2f, System time %.2f\n"
> #ifdef _OSD_POSIX /* Some have only a few fields in the rusage struct */
> "Maximum resident set size %d, Integral resident set size %d\nNon physical pagefaults %d, Physical pagefaults %d, Swaps %d\nBlocks in %d out %d, Messages in %d out %d, Signals %d\nVoluntary context switches %d, Involuntary context switches %d\n"
> #endif
>               ,
101c105,107
<              rus.ru_stime.tv_usec / SCALE_USEC) / 100.0,
---
>              rus.ru_stime.tv_usec / SCALE_USEC) / 100.0
> #ifdef _OSD_POSIX /* Some have only a few fields in the rusage struct */
>               ,
106c112,114
<             rus.ru_nvcsw, rus.ru_nivcsw);
---
>             rus.ru_nvcsw, rus.ru_nivcsw
> #endif
>               );
%