ELM := $(shell command -v elm 2>/dev/null)
GUILE := $(shell command -v guile 2>/dev/null)
ART := $(shell command -v art)
ifndef ELM
ELM = $(error "elm installation not found in PATH")
endif
ifndef GUILE
GUILE = $(error "guile installation not found in PATH")
endif
ifndef ART
ART = $(error "artanis installation not found in PATH")
endif

ELM_TARGET = frontend/www/elm.js