This example shows how to compile a shared object from more than
one C-file:

mycode.o:
        gcc ${CFLAGS} -fPIC -c mycode.c

selstartend.o:
        gcc ${CFLAGS} -fPIC -c selstartend.c

selstartend.so:selstartend.o mycode.o
        ld -G -o selstartend.so selstartend.o mycode.o
