--- freem/src/shmmgr.c	2025/03/09 19:50:47	1.4
+++ freem/src/shmmgr.c	2025/03/24 02:56:50	1.5
@@ -1,5 +1,5 @@
 /*
- *   $Id: shmmgr.c,v 1.4 2025/03/09 19:50:47 snw Exp $
+ *   $Id: shmmgr.c,v 1.5 2025/03/24 02:56:50 snw Exp $
  *    shared memory manager
  *
  *  
@@ -24,6 +24,9 @@
  *   along with FreeM.  If not, see <https://www.gnu.org/licenses/>.
  *
  *   $Log: shmmgr.c,v $
+ *   Revision 1.5  2025/03/24 02:56:50  snw
+ *   Shared memory compatibility fixes for OS/2
+ *
  *   Revision 1.4  2025/03/09 19:50:47  snw
  *   Second phase of REUSE compliance and header reformat
  *
@@ -48,7 +51,7 @@
 #include <sys/ipc.h>
 #include <sys/sem.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 */