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Make sure GNU :code:`m4` is fully installed before you start installing
-Autoconf. Apply :file:`PATCHES-AC` to Autoconf before installing it.
-Have Perl installed before Automake and :code:`help2man`.
+Autoconf. Have Perl installed before Automake and :code:`help2man`.
Python 1.5 and Flex 2.5, or better, are needed for remaking
:file:`merged.c`, after you modify an :file:`.l` source file.