diff --git a/configure/CONFIG_PCAS_VERSION b/configure/CONFIG_PCAS_VERSION
new file mode 100644
index 000000000..4ab8a1271
--- /dev/null
+++ b/configure/CONFIG_PCAS_VERSION
@@ -0,0 +1,14 @@
+EPICS_PCAS_MAJOR_VERSION = 4
+EPICS_PCAS_MINOR_VERSION = 13
+EPICS_PCAS_MAINTENANCE_VERSION = 0
+EPICS_PCAS_DEVELOPMENT_FLAG = 1
+
+EXPANDVARS += EPICS_PCAS_MAJOR_VERSION
+EXPANDVARS += EPICS_PCAS_MINOR_VERSION
+EXPANDVARS += EPICS_PCAS_MAINTENANCE_VERSION
+EXPANDVARS += EPICS_PCAS_DEVELOPMENT_FLAG
+
+EXPANDFLAGS += $(foreach var,$(EXPANDVARS),-D$(var)="$(strip $($(var)))")
+
+# shared library ABI version.
+SHRLIB_VERSION = $(EPICS_PCAS_MAJOR_VERSION).$(EPICS_PCAS_MINOR_VERSION)
diff --git a/src/gdd/Makefile b/src/gdd/Makefile
index 0c8fde26d..640dd3781 100644
--- a/src/gdd/Makefile
+++ b/src/gdd/Makefile
@@ -11,6 +11,8 @@ TOP=../..
 
 include $(TOP)/configure/CONFIG
 
+include $(TOP)/configure/CONFIG_PCAS_VERSION
+
 INC += gdd.h
 INC += gddI.h
 INC += gddContainer.h
diff --git a/src/pcas/build/Makefile b/src/pcas/build/Makefile
index b040bdf7a..6b72edf21 100644
--- a/src/pcas/build/Makefile
+++ b/src/pcas/build/Makefile
@@ -19,11 +19,15 @@ SRC_DIRS += $(SRC)
 SRC_DIRS += $(IOSRC)
 SRC_DIRS += $(STSRC)
 
+include $(TOP)/configure/CONFIG_PCAS_VERSION
+
 #USR_CXXFLAGS = $(USR_CFLAGS)
 
 INC += casdef.h
 INC += casEventMask.h
 INC += caNetAddr.h
+INC += casVersion.h
+INC += casVersionNum.h
 
 LIBSRCS += caServer.cc
 LIBSRCS += caServerI.cc
@@ -85,3 +89,8 @@ cas_RCS = cas.rc
 CLEANS += Templates.DB
 
 include $(TOP)/configure/RULES
+
+# Can't use EXPAND as generated headers must appear
+# in O.Common, but EXPAND emits rules for O.$(T_A)
+../O.Common/casVersionNum.h: ../casVersionNum.h@
+	$(EXPAND_TOOL) $(EXPANDFLAGS) $($@_EXPANDFLAGS) $< $@
diff --git a/src/pcas/build/casVersionNum.h@ b/src/pcas/build/casVersionNum.h@
new file mode 100644
index 000000000..62cd7ecfb
--- /dev/null
+++ b/src/pcas/build/casVersionNum.h@
@@ -0,0 +1,9 @@
+#ifndef CASVERSION_H
+#  error include casVersion.h, not this header
+#endif
+#define EPICS_CAS_MAJOR_VERSION @EPICS_PCAS_MAJOR_VERSION@
+#define EPICS_CAS_MINOR_VERSION @EPICS_PCAS_MINOR_VERSION@
+#define EPICS_CAS_MAINTENANCE_VERSION @EPICS_PCAS_MAINTENANCE_VERSION@
+#define EPICS_CAS_DEVELOPMENT_FLAG @EPICS_PCAS_DEVELOPMENT_FLAG@
+
+#define CAS_VERSION_STRING "PCAS @EPICS_PCAS_MAJOR_VERSION@.@EPICS_PCAS_MINOR_VERSION@.@EPICS_PCAS_MAINTENANCE_VERSION@@EPICS_PCAS_DEVELOPMENT_FLAG@"
diff --git a/src/pcas/generic/caServerI.cc b/src/pcas/generic/caServerI.cc
index e8609eb8a..0e66990f2 100644
--- a/src/pcas/generic/caServerI.cc
+++ b/src/pcas/generic/caServerI.cc
@@ -5,7 +5,7 @@
 *     Operator of Los Alamos National Laboratory.
 * EPICS BASE Versions 3.13.7
 * and higher are distributed subject to a Software License Agreement found
-* in file LICENSE that is included with this distribution. 
+* in file LICENSE that is included with this distribution.
 \*************************************************************************/
 /*
  *      Author  Jeffrey O. Hill
@@ -16,9 +16,9 @@
 #include <stdarg.h>
 #include <stdexcept>
 
-#include "epicsGuard.h"
-#include "epicsVersion.h"
-#include "errlog.h"
+#include <epicsGuard.h>
+#include <epicsVersion.h>
+#include <errlog.h>
 
 #include "addrList.h"
 
@@ -29,11 +29,12 @@
 #include "beaconAnomalyGovernor.h"
 #include "casStreamOS.h"
 #include "casIntfOS.h"
+#include "casVersion.h"
 
 // include a version string for POSIX systems
-static const char pVersionCAS[] = 
-    "@(#) " EPICS_VERSION_STRING 
-    ", CA Portable Server Library ";
+static const char pVersionCAS[] =
+    "@(#) " CAS_VERSION_STRING " (" EPICS_VERSION_STRING ")"
+    ", CA Portable Server Library";
 
 caServerI::caServerI ( caServer & tool ) :
     adapter (tool),
diff --git a/src/pcas/generic/casVersion.h b/src/pcas/generic/casVersion.h
new file mode 100644
index 000000000..b7e0abb91
--- /dev/null
+++ b/src/pcas/generic/casVersion.h
@@ -0,0 +1,20 @@
+#ifndef CASVERSION_H
+#define CASVERSION_H
+
+#include <epicsVersion.h>
+
+#ifndef VERSION_INT
+#  define VERSION_INT(V,R,M,P) ( ((V)<<24) | ((R)<<16) | ((M)<<8) | (P))
+#endif
+
+/* include generated headers with:
+ *   EPICS_CAS_MAJOR_VERSION
+ *   EPICS_CAS_MINOR_VERSION
+ *   EPICS_CAS_MAINTENANCE_VERSION
+ *   EPICS_CAS_DEVELOPMENT_FLAG
+ */
+#include <casVersionNum.h>
+
+#define CAS_VERSION_INT VERSION_INT(EPICS_CAS_MAJOR_VERSION, EPICS_CAS_MINOR_VERSION, EPICS_CAS_MAINTENANCE_VERSION, 0)
+
+#endif // CASVERSION_H