Here are the changes you need to apply to MSGAPI38 to make it handle OS/2
16-bit MSC 6.0...

Index: msgapi/api_sq.c
diff -c msgapi\api_sq.c:1.11 msgapi\api_sq.c:1.12
*** msgapi\api_sq.c:1.11	Wed Jul 24 01:50:42 1996
--- msgapi\api_sq.c	Sat Aug 17 13:16:56 1996
***************
*** 27,33 ****
   *                                                                         *
   ***************************************************************************/
  
! /* $Id: api_sq.c,v 1.11 1996/07/24 01:50:43 edwards Exp $ */
  
  #define NOVARS
  #define NOVER
--- 27,33 ----
   *                                                                         *
   ***************************************************************************/
  
! /* $Id: api_sq.c,v 1.12 1996/08/17 13:16:57 edwards Exp $ */
  
  #define NOVARS
  #define NOVER
***************
*** 1770,1776 ****
        Sqd->idxbuf_size += (sizeof(SQIDX) * EXTRA_BUF);
        
        if (
! #if (defined(__MSDOS__) && !defined(__FLAT__))
            Sqd->idxbuf_size >= 65300L ||
  #endif
            (Sqd->idxbuf=farrealloc(Sqd->idxbuf,
(word)Sqd->idxbuf_size))==NULL)
--- 1770,1776 ----
        Sqd->idxbuf_size += (sizeof(SQIDX) * EXTRA_BUF);
        
        if (
! #if ((defined(__MSDOS__) && !defined(__FLAT__)) || defined(__MSC__))
            Sqd->idxbuf_size >= 65300L ||
  #endif
            (Sqd->idxbuf=farrealloc(Sqd->idxbuf,
(word)Sqd->idxbuf_size))==NULL)
***************
*** 1886,1892 ****
    Sqd->idxbuf_size=ofslen+(EXTRA_BUF*(dword)sizeof(SQIDX));
  
    if (
! #if (defined(__MSDOS__) && !defined(__FLAT__))
      Sqd->idxbuf_size >= 65300L ||
  #endif
        (Sqd->idxbuf=farpalloc((size_t)Sqd->idxbuf_size))==NULL)
--- 1886,1892 ----
    Sqd->idxbuf_size=ofslen+(EXTRA_BUF*(dword)sizeof(SQIDX));
  
    if (
! #if ((defined(__MSDOS__) && !defined(__FLAT__)) || defined(__MSC__))
      Sqd->idxbuf_size >= 65300L ||
  #endif
        (Sqd->idxbuf=farpalloc((size_t)Sqd->idxbuf_size))==NULL)
Index: msgapi/compiler.h
diff -c msgapi\compiler.h:1.6 msgapi\compiler.h:1.7
*** msgapi\compiler.h:1.6	Wed Jul 24 01:50:46 1996
--- msgapi\compiler.h	Sat Aug 17 13:17:00 1996
***************
*** 27,33 ****
   *                                                                         *
   ***************************************************************************/
  
! /* $Id: compiler.h,v 1.6 1996/07/24 01:50:46 edwards Exp $ */
  
  /* Non-DOS systems...  Just do a "#define __FARCODE__",        
            *
   * "#define __FARDATA__" and "#define __LARGE__" in
place of this file.     */
--- 27,33 ----
   *                                                                         *
   ***************************************************************************/
  
! /* $Id: compiler.h,v 1.7 1996/08/17 13:17:00 edwards Exp $ */
  
  /* Non-DOS systems...  Just do a "#define __FARCODE__",        
            *
   * "#define __FARDATA__" and "#define __LARGE__" in
place of this file.     */
***************
*** 56,65 ****
  #ifdef OS_2
  
  #if !defined(__MSC__)
  #ifndef __386__
    #define __386__
  #endif
- 
  #ifndef __FLAT__
    #define __FLAT__
  #endif
--- 56,65 ----
  #ifdef OS_2
  
  #if !defined(__MSC__)
+ 
  #ifndef __386__
    #define __386__
  #endif
  #ifndef __FLAT__
    #define __FLAT__
  #endif
***************
*** 233,238 ****
--- 233,242 ----
    /* MSC 6.0 doesn't appear to have lock + unlock */
    #define unlock(a,b,c)  NW(a)
    #define lock(a,b,c)    0
+   #if defined(OS_2)  
+     #define farread        read
+     #define farwrite       write 
+   #endif
  
  #elif defined(__WATCOMC__)
  
Index: msgapi/makefile.mso
diff -c msgapi\makefile.mso:1.2 msgapi\makefile.mso:1.3
*** msgapi\makefile.mso:1.2	Sun Jul 21 20:35:36 1996
--- msgapi\makefile.mso	Sat Aug 17 13:22:08 1996
***************
*** 10,16 ****
  OBJS=	1stchar.obj msgapi.obj api_sdm.obj api_sq.obj cvtdate.obj \
  	date2bin.obj dosdate.obj fexist.obj ffind.obj flush.obj \
  	months.obj parsenn.obj qksort.obj strftim.obj stristr.obj \
! 	strocpy.obj trail.obj weekday.obj sqasm.obj
  
  .c.obj:
  	$(CC) $(CFLAGS) $(CDEFS) $(COPT) -I$(I) -c $<
--- 10,16 ----
  OBJS=	1stchar.obj msgapi.obj api_sdm.obj api_sq.obj cvtdate.obj \
  	date2bin.obj dosdate.obj fexist.obj ffind.obj flush.obj \
  	months.obj parsenn.obj qksort.obj strftim.obj stristr.obj \
! 	strocpy.obj trail.obj weekday.obj
  
  .c.obj:
  	$(CC) $(CFLAGS) $(CDEFS) $(COPT) -I$(I) -c $<
***************
*** 38,44 ****
      lib ${at} +strocpy.obj,,
      lib ${at} +trail.obj,,
      lib ${at} +weekday.obj,,
-     lib ${at} +sqasm.obj,,
  
  clean:
  	$(RM) msgapi.lib $(TARGET) $(OBJS) 2>/dev/nul
--- 38,43 ----
Index: msgapi/msgapi.h
diff -c msgapi\msgapi.h:1.3 msgapi\msgapi.h:1.4
*** msgapi\msgapi.h:1.3	Wed Jul 24 01:50:46 1996
--- msgapi\msgapi.h	Sat Aug 17 13:17:00 1996
***************
*** 27,33 ****
   *                                                                         *
   ***************************************************************************/
  
! /* $Id: msgapi.h,v 1.3 1996/07/24 01:50:47 edwards Exp $ */
  
  #ifndef __SQAPI_H_DEFINED
  #define __SQAPI_H_DEFINED
--- 27,33 ----
   *                                                                         *
   ***************************************************************************/
  
! /* $Id: msgapi.h,v 1.4 1996/08/17 13:17:01 edwards Exp $ */
  
  #ifndef __SQAPI_H_DEFINED
  #define __SQAPI_H_DEFINED
***************
*** 369,375 ****
  word EXPENTRY NumKludges(char *txt);
  void EXPENTRY RemoveFromCtrl(byte *ctrl,byte *what);
  
! #if (defined(__MSC__) || !defined(OS_2) && !defined(__FLAT__))
  sword far pascal farread(sword handle,byte far *buf,word len);
  sword far pascal farwrite(sword handle,byte far *buf,word len);
  #endif
--- 369,375 ----
  word EXPENTRY NumKludges(char *txt);
  void EXPENTRY RemoveFromCtrl(byte *ctrl,byte *what);
  
! #if (!defined(OS_2) && !defined(__FLAT__))
  sword far pascal farread(sword handle,byte far *buf,word len);
  sword far pascal farwrite(sword handle,byte far *buf,word len);
  #endif
@EOT:

---

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