diff --git a/src/libCom/osi/os/Darwin/osdEnv.c b/src/libCom/osi/os/Darwin/osdEnv.c
new file mode 100644
index 000000000..643986204
--- /dev/null
+++ b/src/libCom/osi/os/Darwin/osdEnv.c
@@ -0,0 +1,86 @@
+/*************************************************************************\
+* Copyright (c) 2002 The University of Saskatchewan
+* 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. 
+\*************************************************************************/
+/* osdEnv.c */
+/*
+ * $Id$
+ *
+ * Author: Eric Norum
+ *   Date: May 7, 2001
+ *
+ * Routines to modify/display environment variables and EPICS parameters
+ *
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <errno.h>
+
+/*
+ * Starting in Mac OS X 10.5 (Leopard) shared libraries and
+ * bundles don't have direct access to environ (man environ).
+ */
+#ifdef __AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER
+# include <crt_externs.h>
+# define environ (*_NSGetEnviron())
+#endif
+
+#define epicsExportSharedSymbols
+#include <epicsStdioRedirect.h>
+#include <errlog.h>
+#include <cantProceed.h>
+#include <envDefs.h>
+#include <osiUnistd.h>
+#include "epicsFindSymbol.h"
+
+/*
+ * Set the value of an environment variable
+ * Leaks memory, but the assumption is that this routine won't be
+ * called often enough for the leak to be a problem.
+ */
+epicsShareFunc void epicsShareAPI epicsEnvSet (const char *name, const char *value)
+{
+    char *cp;
+
+	cp = mallocMustSucceed (strlen (name) + strlen (value) + 2, "epicsEnvSet");
+	strcpy (cp, name);
+	strcat (cp, "=");
+	strcat (cp, value);
+	if (putenv (cp) < 0) {
+		errPrintf(
+                -1L,
+                __FILE__,
+                __LINE__,
+                "Failed to set environment parameter \"%s\" to \"%s\": %s\n",
+                name,
+                value,
+                strerror (errno));
+        free (cp);
+	}
+}
+
+/*
+ * Show the value of the specified, or all, environment variables
+ */
+epicsShareFunc void epicsShareAPI epicsEnvShow (const char *name)
+{
+    if (name == NULL) {
+        extern char **environ;
+        char **sp;
+
+        for (sp = environ ; (sp != NULL) && (*sp != NULL) ; sp++)
+            printf ("%s\n", *sp);
+    }
+    else {
+        const char *cp = getenv (name);
+        if (cp == NULL)
+            printf ("%s is not an environment variable.\n", name);
+        else
+            printf ("%s=%s\n", name, cp);
+    }
+}