[#339, !169] Added macro expansion control.

 This is supposed to fix the last error, but for some reason it doesn't.

doc/Doxyfile

@@ -2060,7 +2060,15 @@ MACRO_EXPANSION        = YES
 # The default value is: NO.
 # This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
 
-EXPAND_ONLY_PREDEF     = NO
+EXPAND_ONLY_PREDEF     = YES
+
+# This macro is supposed to expand only the defined macros.
+
+EXPAND_AS_DEFINED = "HAVE_PRE_0_7_6_SYSREPO"
+
+# This is another macro that can provide specific values by hand.
+
+PREDEFINED = "HAVE_PRE_0_7_6_SYSREPO=1"
 
 # If the SEARCH_INCLUDES tag is set to YES, the include files in the
 # INCLUDE_PATH will be searched if a #include is found.