-If you upgrade from version 0.12.0 or 1.0.0, you shouldn't have
-any problems. Just run "make install", and it will automatically
-update the necessary files, provided that you install LyX the
-same place as an existing version.
+If you upgrade from version 0.12.0 or 1.0.x, you shouldn't have
+any problems. However, in the source we have begun a transition
+to use ANSI C++ more and this can make it hard or impossible to
+compile LyX on old or non-conformant compilers. If the compile is
+successfull everything should be just like in 1.0.4. Just run
+"make install", and it will automatically update the necessary
+files, provided that you install LyX the same place as
+an existing version.