Because DoT is designed to work on lots of different sorts of Unix, there is a program "configure" that makes a makefile. This might seem strange, but basically it customises a makefile for your particular environment (eg. Linux, OpenBSD, FreeBSD, Cygwin, Solaris, Sun).
Once the makefile has been produced, then you can just type "make" to make the program.
I managed to compile DoT (in Cygwin), and for some reason I had to make a makefile (or configure file -something like that), and I didn't exactly understand it.
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