..../mydir$ make
................
.../mydir$ gcc -c -fpic btio.c
.../mydir$ gcc -c -fpic btmisc.c
.../mydir$ gcc -c -fpic btupdate.c
.../mydir$ gcc -shared -o libbt.so btio.o btmisc.o btupdate.o
.../mydir$ ls -l *.so
.../mydir$ gcc -L/home/brock/csci235/labs/linkage/mydir -o bupdate-shared bupdate.c -lbt
.../mydir$ ls -l bupdate-shared 
.../mydir$ ./bupdate-shared 
./bupdate-shared: error while loading shared libraries: libbt.so: cannot open shared object file: No such file or directory
.../mydir$ export LD_LIBRARY_PATH=/home/brock/csci235/labs/linkage/mydir:$LD_LIBRARY_PATH
.../mydir$ ./bupdate-shared