diff --git a/src/misc/pv/epicsException.h b/src/misc/pv/epicsException.h
index 68c9903..9e7c4f8 100644
--- a/src/misc/pv/epicsException.h
+++ b/src/misc/pv/epicsException.h
@@ -181,7 +181,7 @@ do { \
 
 #define PRINT_EXCEPTION(EI) PRINT_EXCEPTION2(EI,stderr)
 
-#ifndef __GNUC__
+#if !defined(__GNUC__) || __GNUC__ < 4
 #  define SHOW_EXCEPTION(EI) ::epics::pvData::detail::showException(EI)
 #else
 #  define SHOW_EXCEPTION(EI) \
diff --git a/src/misc/pv/reftrack.h b/src/misc/pv/reftrack.h
index 5d65e84..9257354 100644
--- a/src/misc/pv/reftrack.h
+++ b/src/misc/pv/reftrack.h
@@ -110,7 +110,7 @@ class epicsShareClass RefMonitor
     Impl *impl;
 public:
     RefMonitor();
-    ~RefMonitor();
+    virtual ~RefMonitor();
 
     void start(double period=10.0);
     void stop();
diff --git a/src/misc/pv/templateMeta.h b/src/misc/pv/templateMeta.h
index 20323a4..bfdf036 100644
--- a/src/misc/pv/templateMeta.h
+++ b/src/misc/pv/templateMeta.h
@@ -10,9 +10,9 @@
 // gently nudge the compiler to inline our wrappers
 // Warning: Only use this when the template body is *small*.
 //          You have been warned!
-#if defined(__MINGW32__) 
+#if defined(__MINGW32__)
 # define FORCE_INLINE inline
-#elif defined(__GNUC__) && __GNUC__>=3
+#elif defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 402)
 # define FORCE_INLINE __attribute__((always_inline)) inline
 #elif defined(_MSC_VER)
 # define FORCE_INLINE __forceinline