Ive included three things, contents of the folder containing uridiag files, a listing of Makefile, and the make install results.
root@K6ECM-2:/trunk_uri# ls fftsg.c Makefile uridiag.c root@K6ECM-2:/trunk_uri# cat Makefile CFLAGS=-Wall all: uridiag install: all install -m 755 uridiag /usr/bin/uridiag uridiag: uridiag.c fftsg.c cc -Wall uridiag.c fftsg.c -o uridiag -lusb -lasound -lm root@K6ECM-2:/trunk_uri# make install cc -Wall uridiag.c fftsg.c -o uridiag -lusb -lasound -lm /usr/bin/ld: /tmp/cc1hh6L8.o: undefined reference to symbol 'pthread_join@@GLIBC_2.4' //lib/arm-linux-gnueabihf/libpthread.so.0: error adding symbols: DSO missing from command line collect2: error: ld returned 1 exit status Makefile:10: recipe for target 'uridiag' failed make: *** [uridiag] Error 1 root@K6ECM-2:/trunk_uri# thanks, Bob