This patch will make Caml Light work on HP-UX 9.01 with cc.  

It is not recommended to install this patch on systems where it is not
needed.  All it does is change some instances of "x - y" to "x + (0 - y)".
And of course it removes the -O flag from the cc command lines.

To install this patch, save this mail in your Caml Light source
directory "src/runtime" as file "patch2", go to that directory and
type "patch <patch2".  (You will need the "patch" utility, which is
widely available in source form. (e.g. from ftp.inria.fr))
Then you can compile and install Caml Light.

*** alloc.c	Sat Jun 19 00:53:32 1993
--- alloc.c.new	Tue Apr  5 21:00:11 1994
***************
*** 82,88 ****
    if (nbr == 0) {
      v = Atom(0);
    } else {
!     while (extern_asp - nbr <= arg_stack_low)
        realloc_stacks();
      for (n = 0; n < nbr; n++)
        *--extern_asp = funct(arr[n]);
--- 82,88 ----
    if (nbr == 0) {
      v = Atom(0);
    } else {
!     while (extern_asp + (0 - nbr) <= arg_stack_low)
        realloc_stacks();
      for (n = 0; n < nbr; n++)
        *--extern_asp = funct(arr[n]);
*** freelist.c	Wed Jun 17 12:12:45 1992
--- freelist.c.new	Tue Apr  5 21:00:11 1994
***************
*** 58,64 ****
      if (Wosize_op (cur) >= sz){
        if (Wosize_op (cur) >= Whsize_wosize (sz) + 1){
  	/* Allocate a chunk from the end of the block. */
! 	new_hp = cur + Bosize_op (cur) - Bhsize_wosize (sz);
  	/* Blue tells the GC not to collect this block. */
  	Hd_hp (new_hp) = Make_header (sz, 0, Blue);
  	Hd_op (cur) = Make_header(Wosize_op(cur) - Whsize_wosize(sz), 0, Blue);
--- 58,64 ----
      if (Wosize_op (cur) >= sz){
        if (Wosize_op (cur) >= Whsize_wosize (sz) + 1){
  	/* Allocate a chunk from the end of the block. */
!         new_hp = cur + Bosize_op (cur) + (0 - Bhsize_wosize (sz));
  	/* Blue tells the GC not to collect this block. */
  	Hd_hp (new_hp) = Make_header (sz, 0, Blue);
  	Hd_op (cur) = Make_header(Wosize_op(cur) - Whsize_wosize(sz), 0, Blue);
*** interp.c	Mon Sep 20 21:25:11 1993
--- interp.c.new	Tue Apr  5 21:00:11 1994
***************
*** 457,463 ****
  
      Instruct(RAISE):
        rsp = (value *) tp;
!       if (rsp >= (value *)((char *) ret_stack_high - initial_rsp_offset)) {
          exn_bucket = accu;
          external_raise = initial_external_raise;
          longjmp(external_raise->buf, 1);
--- 457,463 ----
  
      Instruct(RAISE):
        rsp = (value *) tp;
!       if (rsp >= (value *)((char *) ret_stack_high + (0 - initial_rsp_offset))) {
          exn_bucket = accu;
          external_raise = initial_external_raise;
          longjmp(external_raise->buf, 1);
*** io.c	Tue Aug 17 23:59:24 1993
--- io.c.new	Tue Apr  5 21:00:11 1994
***************
*** 152,158 ****
    dest = Long_val(pos);
    if (dest >= channel->offset &&
        dest <= channel->offset + channel->max - channel->buff) {
!     channel->curr = channel->buff + dest - channel->offset;
    } else {
      flush(channel);
      if (lseek(channel->fd, dest, 0) != dest) sys_error();
--- 152,158 ----
    dest = Long_val(pos);
    if (dest >= channel->offset &&
        dest <= channel->offset + channel->max - channel->buff) {
!     channel->curr = channel->buff + dest + (0 - channel->offset);
    } else {
      flush(channel);
      if (lseek(channel->fd, dest, 0) != dest) sys_error();
***************
*** 285,291 ****
    dest = Long_val(pos);
    if (dest >= channel->offset - (channel->max - channel->buff) &&
        dest <= channel->offset) {
!     channel->curr = channel->max - (channel->offset - dest);
    } else {
      if (lseek(channel->fd, dest, 0) != dest) sys_error();
      channel->offset = dest;
--- 285,291 ----
    dest = Long_val(pos);
    if (dest >= channel->offset - (channel->max - channel->buff) &&
        dest <= channel->offset) {
!     channel->curr = channel->max + (0 - (channel->offset - dest));
    } else {
      if (lseek(channel->fd, dest, 0) != dest) sys_error();
      channel->offset = dest;
*** parsing.c	Sat Feb 27 02:59:13 1993
--- parsing.c.new	Tue Apr  5 21:00:11 1994
***************
*** 136,142 ****
      env->sp = Val_int(sp);
      env->rule_number = Val_int(n);
      env->rule_len = Val_int(m);
!     sp = sp - m + 1;
      m = Short(tables->lhs, n);
      state1 = Int_val(Field(env->s_stack, sp - 1));
      n1 = Short(tables->gindex, m);
--- 136,142 ----
      env->sp = Val_int(sp);
      env->rule_number = Val_int(n);
      env->rule_len = Val_int(m);
!     sp = sp + (0 - m) + 1;
      m = Short(tables->lhs, n);
      state1 = Int_val(Field(env->s_stack, sp - 1));
      n1 = Short(tables->gindex, m);
*** roots.c	Wed Aug 26 15:46:32 1992
--- roots.c.new	Tue Apr  5 21:00:11 1994
***************
*** 35,41 ****
    {
      value *block;
      for (block = c_roots_head; block != NULL; block = (value *) block [1]){
!       for (sp = block - (long) block [0]; sp < block; sp++){
  	copy_fn (sp, *sp);
        }
      }
--- 35,41 ----
    {
      value *block;
      for (block = c_roots_head; block != NULL; block = (value *) block [1]){
!       for (sp = block + (0 - (long) block [0]); sp < block; sp++){
  	copy_fn (sp, *sp);
        }
      }
*** stacks.c	Wed Aug 26 10:03:31 1992
--- stacks.c.new	Tue Apr  5 21:00:11 1994
***************
*** 48,54 ****
    new_high = new_low + size;
  
  #define shift(ptr) \
!     ((char *) new_high - ((char *) arg_stack_high - (char *) (ptr)))
  
    new_asp = (value *) shift(extern_asp);
    bcopy((char *) extern_asp,
--- 48,54 ----
    new_high = new_low + size;
  
  #define shift(ptr) \
!     ((char *) new_high + (0 - ((char *) arg_stack_high - (char *) (ptr))))
  
    new_asp = (value *) shift(extern_asp);
    bcopy((char *) extern_asp,
***************
*** 82,88 ****
    new_high = new_low + size;
  
  #define shift(ptr) \
!     ((char *) new_high - ((char *) ret_stack_high - (char *) (ptr)))
  
    new_rsp = (value *) shift(extern_rsp);
    bcopy((char *) extern_rsp,
--- 82,88 ----
    new_high = new_low + size;
  
  #define shift(ptr) \
!     ((char *) new_high + (0 - ((char *) ret_stack_high - (char *) (ptr))))
  
    new_rsp = (value *) shift(extern_rsp);
    bcopy((char *) extern_rsp,
*** Makefile	Fri Aug 27 03:00:22 1993
--- Makefile.new	Tue Apr  5 21:00:11 1994
***************
*** 3,9 ****
  # These options are overriden when called from ../Makefile.
  CC=gcc
  OPTS=-DANSI
! CFLAGS=-O $(OPTS)
  
  # This is the list of libraries that have to be linked with the runtime
  # system. On most machines, all you need is the math library "-lm" 
--- 3,9 ----
  # These options are overriden when called from ../Makefile.
  CC=gcc
  OPTS=-DANSI
! CFLAGS= $(OPTS)
  
  # This is the list of libraries that have to be linked with the runtime
  # system. On most machines, all you need is the math library "-lm"