diff --git a/compiler/defines.inc b/compiler/defines.inc
new file mode 100644
index 0000000000..c3265008e8
--- /dev/null
+++ b/compiler/defines.inc
@@ -0,0 +1,35 @@
+{$ifdef FPC}
+  {$ifdef DELPHI}
+    {$mode delphi}
+    {$asmmode intel}
+  {$else}
+    {$mode objfpc}
+    {$H-}
+    {$goto on}
+
+    { This reduces the memory requirements a lot }
+    {$PACKENUM 1}
+
+    {$define FPCPROCVAR}
+    {$ifdef I386}
+      {$define USEEXCEPT}
+    {$endif}
+  {$endif}
+{$endif}
+
+{$ifdef DELPHI}
+  {$H-}
+  {$J+}
+
+  {$Z1}
+
+  {$undef FPCPROCVAR}
+  {$define USEEXCEPT}
+{$endif}
+
+{$ifdef i386}
+  {$define x86}
+{$endif i386}
+{$ifdef x86_64}
+  {$define x86}
+{$endif x86_64}
diff --git a/compiler/fpcdefs.inc b/compiler/fpcdefs.inc
index 4c107c7f7f..c3265008e8 100644
--- a/compiler/fpcdefs.inc
+++ b/compiler/fpcdefs.inc
@@ -26,3 +26,10 @@
   {$undef FPCPROCVAR}
   {$define USEEXCEPT}
 {$endif}
+
+{$ifdef i386}
+  {$define x86}
+{$endif i386}
+{$ifdef x86_64}
+  {$define x86}
+{$endif x86_64}