Trouble-shooting for undefined reference to xx

link path and sequence

1. The path specified by -L options, then

2. The path defined by LIBRARY_PATH, then

3. The path specified by /etc/ld.so.conf, then

4. /lib and /usr/lib or lib64 and /usr/lib64

dynamic lib path

1. The path specified by ld -rpath, then

2. The path specified by ld, then

3. The path defined by LD_LIBRARY_PATH, then

4. /lib and /usr/lib or /lib64 and /usr/lib64