--- freem/src/locktab.c	2025/03/09 19:14:25	1.4
+++ freem/src/locktab.c	2025/03/24 02:57:25	1.5
@@ -1,5 +1,5 @@
 /*
- *   $Id: locktab.c,v 1.4 2025/03/09 19:14:25 snw Exp $
+ *   $Id: locktab.c,v 1.5 2025/03/24 02:57:25 snw Exp $
  *    lock table implementation
  *
  *  
@@ -24,6 +24,9 @@
  *   along with FreeM.  If not, see <https://www.gnu.org/licenses/>.
  *
  *   $Log: locktab.c,v $
+ *   Revision 1.5  2025/03/24 02:57:25  snw
+ *   Shared memory compatibility fixes for OS/2
+ *
  *   Revision 1.4  2025/03/09 19:14:25  snw
  *   First phase of REUSE compliance and header reformat
  *
@@ -44,7 +47,7 @@
 #include "mref.h"
 #include "transact.h"
 
-#if !defined(__OpenBSD__) && !defined(__APPLE__)
+#if !defined(__OpenBSD__) && !defined(__APPLE__) && !defined(__OS2__)
 union semun {
     int              val;    /* Value for SETVAL */
     struct semid_ds *buf;    /* Buffer for IPC_STAT, IPC_SET */