diff --git a/conf/Makefile.sim b/conf/Makefile.sim
index 3b5315cf8d..40657cc54b 100644
--- a/conf/Makefile.sim
+++ b/conf/Makefile.sim
@@ -58,12 +58,23 @@ CFLAGS += -std=gnu99
 
 LDFLAGS		=	-lm
 
+# build sim in custom mode for Darwin and ARM systems for now...
 UNAME = $(shell uname -s)
-ifeq ("$(UNAME)","Darwin")
-	CAMLINCLUDES += $(shell ocamlfind query -r -i-format lablgtk2) $(shell ocamlfind query -r -i-format xml-light)
+ifeq ($(UNAME),Darwin)
+SIMSITLCUSTOM=TRUE
+endif
+
+MNAME = $(shell uname -m)
+ifneq (,$(findstring arm,$(MNAME)))
+SIMSITLCUSTOM=TRUE
+endif
+
+ifdef SIMSITLCUSTOM
+	CAMLINCLUDES += $(shell ocamlfind query -r -i-format lablgtk2) $(shell ocamlfind query -r -i-format xml-light) $(shell ocamlfind query -r -i-format glibivy)
 	CAMLCMAS = unix.cma str.cma xml-light.cma glibivy-ocaml.cma lib-pprz.cma lablgtk.cma
 endif
 
+
 #
 # General rules
 #
@@ -79,7 +90,7 @@ autopilot.so : $($(TARGET).objs)
 	@echo BUILD $@
 	$(Q)$(CC) -shared -o $(OBJDIR)/$@ $^
 
-ifeq ("$(UNAME)","Darwin")
+ifdef SIMSITLCUSTOM
 $(OBJDIR)/simsitl : $($(TARGET).objs) $(SITLCMA) $(SIMSITLML)
 	@echo LD $@
 	$(Q)$(OCAMLC) -g -custom $(CAMLINCLUDES) -o $@ $(CAMLCMAS) $(MYGTKINITCMO) $^