diff --git a/Makefile b/Makefile
index 0efddaa275..3730842a9f 100644
--- a/Makefile
+++ b/Makefile
@@ -47,7 +47,7 @@ MISC=sw/ground_segment/misc
 LOGALIZER=sw/logalizer
 SIMULATOR=sw/simulator
 EXT=sw/ext
-MAKE=make PAPARAZZI_SRC=$(PAPARAZZI_SRC) PAPARAZZI_HOME=$(PAPARAZZI_HOME)
+MAKE:=$(MAKE) PAPARAZZI_SRC=$(PAPARAZZI_SRC) PAPARAZZI_HOME=$(PAPARAZZI_HOME)
 CONF=$(PAPARAZZI_SRC)/conf
 STATICINCLUDE =$(PAPARAZZI_HOME)/var/include
 MESSAGES_H=$(STATICINCLUDE)/messages.h
@@ -252,7 +252,7 @@ cleanspaces:
 
 distclean : dist_clean
 dist_clean :
-	@echo "Warning: This removes all non-repository files. This means you will loose your aircraft list, your maps, your logfiles, ... if you want this, then run: make dist_clean_irreversible"
+	@echo "Warning: This removes all non-repository files. This means you will loose your aircraft list, your maps, your logfiles, ... if you want this, then run: $(MAKE) dist_clean_irreversible"
 
 dist_clean_irreversible: clean
 	rm -rf conf/srtm_data
@@ -270,7 +270,7 @@ test_all_example_airframes:
 	$(MAKE) AIRCRAFT=EasyStar_ETS clean_ac ap sim
 
 test_all_example_airframes2:
-	for ap in `grep name conf/conf.xml.example | sed -e 's/.*name=\"//' | sed -e 's/"//'`; do echo "Making $$ap"; make -C ./ AIRCRAFT=$$ap clean_ac ap.compile;   done
+	for ap in `grep name conf/conf.xml.example | sed -e 's/.*name=\"//' | sed -e 's/"//'`; do echo "Making $$ap"; $(MAKE) -C ./ AIRCRAFT=$$ap clean_ac ap.compile || exit 1;   done
 
 commands: paparazzi sw/simulator/launchsitl
 
diff --git a/Makefile.ac b/Makefile.ac
index 3d04b1aa22..d738526d7f 100644
--- a/Makefile.ac
+++ b/Makefile.ac
@@ -51,7 +51,7 @@ SETTINGS_FILE=$(SETTINGS:settings%=%)
 #TUNING_FILE=$(subst   ,_,$(SETTINGS:settings/%.xml=%)).h
 TUNING_H=$(AC_GENERATED)/tuning.h
 SUPERVISION=./paparazzi
-MAKE=make PAPARAZZI_SRC=$(PAPARAZZI_SRC) PAPARAZZI_HOME=$(PAPARAZZI_HOME)
+MAKE:=$(MAKE) PAPARAZZI_SRC=$(PAPARAZZI_SRC) PAPARAZZI_HOME=$(PAPARAZZI_HOME)
 MODULES_H=$(AC_GENERATED)/modules.h
 AIRCRAFT_MD5=$(AIRCRAFT_CONF_DIR)/aircraft.md5
 
@@ -138,7 +138,7 @@ $(MODULES_H) : $(CONF)/$(AIRFRAME_XML) $(TOOLS)/gen_modules.out $(CONF)/modules/
 $(SETTINGS_MODULES) : $(MODULES_H)
 
 %.ac_h : $(TOOLS)/gen_aircraft.out
-	$(Q)if (expr "$(AIRCRAFT)"); then : ; else echo "AIRCRAFT undefined: type 'make AIRCRAFT=AircraftName ...'"; exit 1; fi
+	$(Q)if (expr "$(AIRCRAFT)"); then : ; else echo "AIRCRAFT undefined: type '$(MAKE) AIRCRAFT=AircraftName ...'"; exit 1; fi
 	@echo BUILD $(AIRCRAFT), TARGET $*
 	+$(Q)PAPARAZZI_SRC=$(PAPARAZZI_SRC) PAPARAZZI_HOME=$(PAPARAZZI_HOME) TARGET=$* Q=$(Q) $(TOOLS)/gen_aircraft.out $(AIRCRAFT)
 
@@ -187,5 +187,5 @@ check_fuses_fbw: fbw.check_fuses
 hard_ac ac: ac_h fbw ap
 
 clean_ac :
-	$(Q)if (expr "$(AIRCRAFT)"); then : ; else echo "AIRCRAFT undefined: type 'make AIRCRAFT=AircraftName ...'"; exit 1; fi
+	$(Q)if (expr "$(AIRCRAFT)"); then : ; else echo "AIRCRAFT undefined: type '$(MAKE) AIRCRAFT=AircraftName ...'"; exit 1; fi
 	rm -fr $(PAPARAZZI_HOME)/var/$(AIRCRAFT)
diff --git a/conf/autopilot/subsystems/fixedwing/autopilot.makefile b/conf/autopilot/subsystems/fixedwing/autopilot.makefile
index cbd327bfb5..4d4b89a45c 100644
--- a/conf/autopilot/subsystems/fixedwing/autopilot.makefile
+++ b/conf/autopilot/subsystems/fixedwing/autopilot.makefile
@@ -173,7 +173,7 @@ ap_srcs			+= $(SRC_FIRMWARE)/ap_downlink.c
 
 UNAME = $(shell uname -s)
 ifeq ("$(UNAME)","Darwin")
-  sim.CFLAGS += -I/opt/paparazzi/include/ -I/opt/local/include/
+  sim.CFLAGS += $(shell if test -d /opt/local/include; then echo "-I/opt/local/include"; elif test -d /opt/paparazzi/include; then echo "-I/opt/paparazzi/include"; fi)
 endif
 
 sim.CFLAGS              += $(CPPFLAGS)
diff --git a/sw/ground_segment/lpc21iap/Makefile b/sw/ground_segment/lpc21iap/Makefile
index dc4a954a37..419a2717a3 100644
--- a/sw/ground_segment/lpc21iap/Makefile
+++ b/sw/ground_segment/lpc21iap/Makefile
@@ -27,12 +27,10 @@ endif
 
 UNAME = $(shell uname -s)
 ifeq ("$(UNAME)","Darwin")
-  LIBRARYS = -L /opt/paparazzi/lib -L /opt/local/lib
-  INCLUDES = -I /opt/paparazzi/include -I /opt/local/include/
+  LIBRARYS = $(shell if test -d /opt/local/lib; then echo "-L /opt/local/lib"; elif test -d /opt/paparazzi/lib; then echo "-L /opt/paparazzi/lib"; fi)
+  INCLUDES = $(shell if test -d /opt/local/include; then echo "-I /opt/local/include"; elif test -d /opt/paparazzi/include; then echo "-I /opt/paparazzi/include"; fi)
 endif
 
-
-
 CFLAGS  = -Wall -g $(FPIC) $(INCLUDES) $(LIBRARYS)
 
 SOURCES =	lpc21iap.c elf.c lpcusb.c
diff --git a/sw/ground_segment/misc/Makefile b/sw/ground_segment/misc/Makefile
index 7870fe7e62..08572c95ae 100644
--- a/sw/ground_segment/misc/Makefile
+++ b/sw/ground_segment/misc/Makefile
@@ -1,8 +1,8 @@
 UNAME = $(shell uname -s)
 
 ifeq ("$(UNAME)","Darwin")
-  LIBRARYS = -L /opt/paparazzi/lib -L /opt/local/lib
-  INCLUDES = -I /opt/paparazzi/include -I /opt/local/include/
+  LIBRARYS = $(shell if test -d /opt/local/lib; then echo "-L /opt/local/lib"; elif test -d /opt/paparazzi/lib; then echo "-L /opt/paparazzi/lib"; fi)
+  INCLUDES = $(shell if test -d /opt/local/include; then echo "-I /opt/local/include"; elif test -d /opt/paparazzi/include; then echo "-I /opt/paparazzi/include"; fi)
 else
   LIBRARYS = -s
 endif
diff --git a/sw/ground_segment/multimon/Makefile b/sw/ground_segment/multimon/Makefile
index d7c9d2988b..45e235386e 100644
--- a/sw/ground_segment/multimon/Makefile
+++ b/sw/ground_segment/multimon/Makefile
@@ -32,7 +32,7 @@ LD		=ld
 LDFLAGS		=-lm
 HOSTCC		=gcc
 CC		=gcc
-MAKE		=make
+MAKE		:=$(MAKE)
 CPP		=$(CC) -E
 AR		=ar
 STRIP		=strip
diff --git a/sw/lib/ocaml/xml2h.ml b/sw/lib/ocaml/xml2h.ml
index 0aca62a239..093e42af8a 100644
--- a/sw/lib/ocaml/xml2h.ml
+++ b/sw/lib/ocaml/xml2h.ml
@@ -77,6 +77,6 @@ let finish = fun h_name ->
 
 let warning s =
   Printf.fprintf stderr "##################################################\n";
-  Printf.fprintf stderr "\n %s\n" s;
-  Printf.fprintf stderr "\n##################################################\n"
+  Printf.fprintf stderr " %s\n" s;
+  Printf.fprintf stderr "##################################################\n"
 
diff --git a/sw/supervision/Makefile b/sw/supervision/Makefile
index 462de61158..abfa686910 100644
--- a/sw/supervision/Makefile
+++ b/sw/supervision/Makefile
@@ -4,7 +4,7 @@ Q=@
 OCAMLC = ocamlc
 OCAMLOPT = ocamlopt
 OCAMLLIB = ../lib/ocaml
-INCLUDES= -I $(OCAMLLIB) -I ../multimon $(shell ocamlfind query -r -i-format lablgtk2) $(shell ocamlfind query -r -i-format xml-light)
+INCLUDES= -I $(OCAMLLIB) $(shell ocamlfind query -r -i-format lablgtk2) $(shell ocamlfind query -r -i-format xml-light)
 LIBPPRZCMA=$(OCAMLLIB)/lib-pprz.cma
 PAPARAZZICENTERCMO = gtk_pc.cmo gtk_process.cmo pc_common.cmo pc_aircraft.cmo pc_control_panel.cmo paparazzicenter.cmo