Use a more portable file reader which does not require GNU Make 4.2+ .

Author: jonasbardino

Makefile

@@ -134,7 +134,7 @@ initservices:
 @echo $$ENABLED_SERVICES > ./.enabled_services
 
 up:	initcomposevars initservices
-${DOCKER_COMPOSE} up ${DETACH} $(file < ./.enabled_services)
+${DOCKER_COMPOSE} up ${DETACH} $(shell head -n1 .enabled_services)
 
 down:	initcomposevars
 # NOTE: To suppress podman warnings about missing containers use: