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A _very_ quick look suggests that a Makefile might be overkill.

At the top of the BbSerial.c file are two commented out lines. Try uncommenting them;
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static char *serial_version = "5.05c";
static char *serial_revdate = "2001-07-08";


The comment out the line that includes the missing header file'

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##include "BbVersion.h"


and see if you can compile that;

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gcc BbSerial.c -o BbSerial.o



I'll slap myself very hard if that works! I'd obviously already changed the source file to eradicate the bbversion header - I guess I really should have tried basic gcc compile first, I've only ever written one module and that was only a test on 2.6.X - which is different. Oh well, I'll try that tomorrow.