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diff --git a/admin/CPP-DEFINES b/admin/CPP-DEFINES
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index 00000000000..0490d89325e
--- /dev/null
+++ b/admin/CPP-DEFINES
@@ -0,0 +1,26 @@
+Here are some of the cpp macros used, together with some short explanation
+of their use.  Feel free to add more macros and more categories.
+
+** Distinguishing OSes **
+
+MAC_OS          Compiling for some version of Mac OS?
+MAC_OS8         Compiling for Mac OS version 8.  Requires MAC_OS?
+MAC_OSX         Compiling for Mac OS X?  Is that also valid for Darwin?
+MAC_OS_X        ??  Apparently only used once in mac.c.
+CYGWIN          Compiling the Cygwin port.
+MSDOS           Compiling the MSDOS port.
+DOS_NT          Compiling for either the MSDOS or W32 port.
+WINDOWSNT       Compiling the W32 port.
+WINDOWS_NT      ??  Only once in dispextern.h
+
+** Distinguishing GUIs **
+
+HAVE_NTGUI      Compile support for the W32 GUI.
+HAVE_CARBON     Compile support for the Carbon GUI.  Requires MAC_OS?
+HAVE_X11        Compile support for the X11 GUI.
+X11             ??  Makefile.in suggests it's equivalent to HAVE_X11
+USE_LUCID       Use the Lucid toolkit for menus&scrollbars.  Requires HAVE_X11.
+USE_MOTIF       Use the Motif toolkit for menus&scrollbars.  Requires HAVE_X11.
+USE_GTK         Use the Gtk   toolkit for menus&scrollbars.  Requires HAVE_X11.
+
+# arch-tag: bc80061a-1168-4911-9766-46aaf2640250
diff --git a/admin/ChangeLog b/admin/ChangeLog
index db8795f3aaa..516cecfbb6d 100644
--- a/admin/ChangeLog
+++ b/admin/ChangeLog
@@ -1,3 +1,7 @@
+2007-12-10  Stefan Monnier  <monnier@iro.umontreal.ca>
+
+        * CPP-DEFINES: New file.
+
 2007-12-08  Reiner Steib  <Reiner.Steib@gmx.de>
 
         * FOR-RELEASE: Remove "window-system in face definition" [of