diff --git a/lib/delphi/src/Thrift.Defines.inc b/lib/delphi/src/Thrift.Defines.inc
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+++ b/lib/delphi/src/Thrift.Defines.inc
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+(*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *)
+
+
+// Good lists of Delphi version numbers
+// https://github.com/project-jedi/jedi/blob/master/jedi.inc
+// http://docwiki.embarcadero.com/RADStudio/Seattle/en/Compiler_Versions
+
+
+// start with most backwards compatible defaults
+
+{$DEFINE OLD_UNIT_NAMES}
+{$DEFINE OLD_SOCKETS}      // TODO: add socket support for CompilerVersion >= 28.0
+{$UNDEF HAVE_CLASS_CTOR}
+
+
+// enable features as they are available
+
+{$IF CompilerVersion >= 21.0}   // Delphi 2010
+  {$DEFINE HAVE_CLASS_CTOR}
+{$IFEND}
+
+{$IF CompilerVersion >= 23.0}   // Delphi XE2
+  {$UNDEF OLD_UNIT_NAMES}
+{$IFEND}
+
+{$IF CompilerVersion >= 28.0}   // Delphi XE7
+  {$UNDEF OLD_SOCKETS}
+{$IFEND}
+
+
+// EOF
+
+