How to add a c file to be compiled with a package

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http://askubuntu.com – I want to add a file hstest.c which comes with bluez package but not by default added to the makefile to the sources that are compiled with the buid system. I read about makefiles and autotools but now I am hesitant to make changes to the makefiles. Should I modify the makefile.am and then run automake or just change the makefile.in or the makefile itself ? and how ? config script Makefile.am Makefile Makefile.in (HowTos)