diff --git a/mozilla/modules/libimg/gifcom/dllcompat.cpp b/mozilla/modules/libimg/gifcom/dllcompat.cpp
index 8c8efe8b63e..35e529b818d 100644
--- a/mozilla/modules/libimg/gifcom/dllcompat.cpp
+++ b/mozilla/modules/libimg/gifcom/dllcompat.cpp
@@ -34,7 +34,7 @@ the local dll. So far,
 #include "prmem.h"
 
 #include "nsCRT.h"
-
+#include "xp_mcom.h"
 
 PR_BEGIN_EXTERN_C
 int MK_UNABLE_TO_LOCATE_FILE = -1;
@@ -67,6 +67,10 @@ PR_END_EXTERN_C
 
 #if defined(XP_MAC)
 
+#ifndef UNIXMINUSMACTIME
+#define UNIXMINUSMACTIME 2082844800UL
+#endif
+
 /* prototypes for local routines */
 static void  shortsort(char *lo, char *hi, unsigned width,
                 int ( *comp)(const void *, const void *));
diff --git a/mozilla/modules/libimg/jpgcom/dllcompat.cpp b/mozilla/modules/libimg/jpgcom/dllcompat.cpp
index d7301cd4c86..35e529b818d 100644
--- a/mozilla/modules/libimg/jpgcom/dllcompat.cpp
+++ b/mozilla/modules/libimg/jpgcom/dllcompat.cpp
@@ -34,6 +34,7 @@ the local dll. So far,
 #include "prmem.h"
 
 #include "nsCRT.h"
+#include "xp_mcom.h"
 
 PR_BEGIN_EXTERN_C
 int MK_UNABLE_TO_LOCATE_FILE = -1;
@@ -62,8 +63,14 @@ int XP_MSG_UNKNOWN = -26;
 int XP_MSG_COMPRESS_REMOVE = -27;	
 PR_END_EXTERN_C
 
+
+
 #if defined(XP_MAC)
 
+#ifndef UNIXMINUSMACTIME
+#define UNIXMINUSMACTIME 2082844800UL
+#endif
+
 /* prototypes for local routines */
 static void  shortsort(char *lo, char *hi, unsigned width,
                 int ( *comp)(const void *, const void *));
diff --git a/mozilla/modules/libimg/pngcom/dllcompat.cpp b/mozilla/modules/libimg/pngcom/dllcompat.cpp
index 7bc6d028148..35e529b818d 100644
--- a/mozilla/modules/libimg/pngcom/dllcompat.cpp
+++ b/mozilla/modules/libimg/pngcom/dllcompat.cpp
@@ -34,6 +34,7 @@ the local dll. So far,
 #include "prmem.h"
 
 #include "nsCRT.h"
+#include "xp_mcom.h"
 
 PR_BEGIN_EXTERN_C
 int MK_UNABLE_TO_LOCATE_FILE = -1;
@@ -63,8 +64,13 @@ int XP_MSG_COMPRESS_REMOVE = -27;
 PR_END_EXTERN_C
 
 
+
 #if defined(XP_MAC)
 
+#ifndef UNIXMINUSMACTIME
+#define UNIXMINUSMACTIME 2082844800UL
+#endif
+
 /* prototypes for local routines */
 static void  shortsort(char *lo, char *hi, unsigned width,
                 int ( *comp)(const void *, const void *));