$ make libtool --tag=CC --mode=compile gcc -O2 -Wall -g -c client.c
libtool: compile: gcc -O2 -Wall -g -c client.c -fPIC -DPIC -o .libs/client.o libtool: compile: gcc -O2 -Wall -g -c client.c -o client.o >/dev/null 2>&1 libtool --tag=CC --mode=compile gcc -O2 -Wall -g -c message.c libtool: compile: gcc -O2 -Wall -g -c message.c -fPIC -DPIC -o .libs/message.o message.c: In function ‘get_field_timespec’: message.c:504:2: error: label at end of compound statement default: ^~~~~~~ make: *** [Makefile:21: message.lo] Error 1 $ gcc --version gcc (Debian 8.3.0-6) 8.3.0 Copyright (C) 2018 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.