mksquashfs: fatal error: options (e.g. -comp) should be specified after source
and output filesystem

SYNTAX: mksquashfs source1 source2 ...  FILESYSTEM [OPTIONS] [-e list of exclude
dirs/files]

Run
  "mksquashfs -help-option <regex>" to get help on all options matching <regex>

Or run
  "mksquashfs -help-section <section-name>" to get help on these sections
	SECTION NAME		SECTION
	compression		Filesystem compression options:
	build			Filesystem build options:
	time			Filesystem time options:
	perms			Filesystem permissions options:
	pseudo			Filesystem pseudo options:
	filter			Filesystem filter options:
	xattrs			Filesystem extended attribute (xattrs) options:
	runtime			Mksquashfs runtime options:
	append			Filesystem append options:
	actions			Filesystem actions options:
	tar			Tar file only options:
	expert			Expert options (these may make the filesystem
				unmountable):
	help			Help options:
	misc			Miscellaneous options:
	pseudo-defs		Pseudo file definition format:
	symbolic		Symbolic mode specification:
	environment		Environment:
	exit			Exit status:
	extra			See also (extra information elsewhere):

Or run
  "mksquashfs -help-all" to get help on all the sections