In /usr/bin/libmikmod-config line 18:
	-*=*) optarg=`echo "$1" | sed 's/[-_a-zA-Z0-9]*=//'` ;;
                     ^-- SC2006: Use $(...) notation instead of legacy backticked `...`.

Did you mean: 
	-*=*) optarg=$(echo "$1" | sed 's/[-_a-zA-Z0-9]*=//') ;;


In /usr/bin/libmikmod-config line 30:
		echo $prefix
                     ^-----^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
		echo "$prefix"


In /usr/bin/libmikmod-config line 37:
		echo $exec_prefix
                     ^----------^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
		echo "$exec_prefix"

For more information:
  https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing ...
  https://www.shellcheck.net/wiki/SC2006 -- Use $(...) notation instead of le...