In /usr/bin/taglib-config line 18:
exec_prefix=/usr
^---------^ SC2034: exec_prefix appears unused. Verify use (or export if used externally).


In /usr/bin/taglib-config line 54:
  echo $flags
       ^----^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
  echo "$flags"

For more information:
  https://www.shellcheck.net/wiki/SC2034 -- exec_prefix appears unused. Verif...
  https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing ...