TRUE = 11111
gt = $(shell if [ $1 -gt $2 ] ; then echo $(TRUE); fi)
lt = $(shell if [ $1 -lt $2 ] ; then echo $(TRUE); fi)
le = $(shell if [ $1 -le $2 ] ; then echo $(TRUE); fi)

qsort = \
    $(if $(call le,$(words $1),1),$1, \
        $(call qsort, \
	    $(foreach i,$1, \
                $(if $(call gt,$(firstword $1),$i), $i,))) \
    $(firstword $1) \
    $(call qsort, \
        $(foreach i,$1, \
            $(if $(call lt,$(firstword $1),$i), $i,))))

data = $(shell od -vAn -N10 -w1 -tu1 < /dev/urandom)

all:
	@echo $(call qsort, $(data))