automake 과정

prerequisite*            command                     product
-------------           ---------                   ---------

configure.ac* ----------> aclocal
                            |
                            |
                         autoconf -----------------> configure
                            |
                            |
Makefile.am* -------->  "automake --add-missing --foreign --copy"
                            |
                            |
----------------------------+-----------------------------------
                            |
                        configure -----------------> Makefile
                            |
                            |
                           make