Darwin's osdEnv.c was updated while I was working on this, changed my updated version to match.

src/libCom/osi/os/Darwin/osdEnv.c

@@ -25,44 +25,21 @@
  * Starting in Mac OS X 10.5 (Leopard) shared libraries and
  * bundles don't have direct access to environ (man environ).
  */
-# include <crt_externs.h>
-# define environ (*_NSGetEnviron())
+#include <crt_externs.h>
+#define environ (*_NSGetEnviron())
 
 #define epicsExportSharedSymbols
 #include "epicsStdio.h"
-#include <errlog.h>
-#include <cantProceed.h>
 #include <envDefs.h>
-#include <osiUnistd.h>
-#include "epicsFindSymbol.h"
 #include <iocsh.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;
-
     iocshEnvClear(name);
-    
-	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);
-	}
+    setenv(name, value, 1);
 }
 
 /*