diff --git a/src/libs/ifc/xml/vpatternconverter.h b/src/libs/ifc/xml/vpatternconverter.h
index eab0787e1..b233d6a7e 100644
--- a/src/libs/ifc/xml/vpatternconverter.h
+++ b/src/libs/ifc/xml/vpatternconverter.h
@@ -52,8 +52,14 @@ public:
 
     static const QString PatternMaxVerStr;
     static const QString CurrentSchema;
+// GCC 4.6 doesn't allow constexpr and const together
+#if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) > 406
     static Q_DECL_CONSTEXPR const int PatternMinVer = CONVERTER_VERSION_CHECK(0, 1, 0);
     static Q_DECL_CONSTEXPR const int PatternMaxVer = CONVERTER_VERSION_CHECK(0, 3, 3);
+#else
+    static Q_DECL_CONSTEXPR int PatternMinVer = CONVERTER_VERSION_CHECK(0, 1, 0);
+    static Q_DECL_CONSTEXPR int PatternMaxVer = CONVERTER_VERSION_CHECK(0, 3, 3);
+#endif
 
 protected:
     virtual int     MinVer() const Q_DECL_OVERRIDE;
diff --git a/src/libs/ifc/xml/vvitconverter.h b/src/libs/ifc/xml/vvitconverter.h
index 974a4fb4f..942ebf666 100644
--- a/src/libs/ifc/xml/vvitconverter.h
+++ b/src/libs/ifc/xml/vvitconverter.h
@@ -48,8 +48,14 @@ public:
 
     static const QString MeasurementMaxVerStr;
     static const QString CurrentSchema;
+// GCC 4.6 doesn't allow constexpr and const together
+#if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) > 406
     static Q_DECL_CONSTEXPR const int MeasurementMinVer = CONVERTER_VERSION_CHECK(0, 2, 0);
     static Q_DECL_CONSTEXPR const int MeasurementMaxVer = CONVERTER_VERSION_CHECK(0, 3, 3);
+#else
+    static Q_DECL_CONSTEXPR int MeasurementMinVer = CONVERTER_VERSION_CHECK(0, 2, 0);
+    static Q_DECL_CONSTEXPR int MeasurementMaxVer = CONVERTER_VERSION_CHECK(0, 3, 3);
+#endif
 
 protected:
     virtual int     MinVer() const Q_DECL_OVERRIDE;
diff --git a/src/libs/ifc/xml/vvstconverter.h b/src/libs/ifc/xml/vvstconverter.h
index 72e03a84a..39c07af07 100644
--- a/src/libs/ifc/xml/vvstconverter.h
+++ b/src/libs/ifc/xml/vvstconverter.h
@@ -48,8 +48,14 @@ public:
 
     static const QString MeasurementMaxVerStr;
     static const QString CurrentSchema;
+// GCC 4.6 doesn't allow constexpr and const together
+#if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) > 406
     static Q_DECL_CONSTEXPR const int MeasurementMinVer = CONVERTER_VERSION_CHECK(0, 3, 0);
     static Q_DECL_CONSTEXPR const int MeasurementMaxVer = CONVERTER_VERSION_CHECK(0, 4, 2);
+#else
+    static Q_DECL_CONSTEXPR int MeasurementMinVer = CONVERTER_VERSION_CHECK(0, 3, 0);
+    static Q_DECL_CONSTEXPR int MeasurementMaxVer = CONVERTER_VERSION_CHECK(0, 4, 2);
+#endif
 
 protected:
     virtual int     MinVer() const Q_DECL_OVERRIDE;