1
 2.SECONDEXPANSION:
 3sim_base_rgg := just_a_name
 4sim_base_src := a
 5sim_base_f := a a a
 6sim_%.f: $${sim_$$*_f} ; echo $@
 7sim_%.src: $${sim_$$*_src} ; echo $@
 8sim_%: \
 9        $$(if $$(sim_$$*_src),sim_%.src) \
10        $$(if $$(sim_$$*_f),sim_%.f) \
11        $$(if $$(sim_$$*_rgg),$$(sim_$$*_rgg).s) ; echo $@