diff --git a/owlps-ardrone/Makefile b/owlps-ardrone/Makefile
index ad5e98d..6ac4292 100644
--- a/owlps-ardrone/Makefile
+++ b/owlps-ardrone/Makefile
@@ -1,6 +1,6 @@
 # Source version
 ifndef OWLPS_VERSION
-        OWLPS_VERSION = $(shell git describe || echo 'UNKNOWN_VERSION')
+	OWLPS_VERSION := $(shell git describe 2>/dev/null || echo 'UNKNOWN_VERSION')
 endif
 
 # Répertoire d'installation
@@ -29,14 +29,16 @@ LIBOWLPS_DIR = ../libowlps
 LIBOWLPSCLIENT_DIR = ../libowlps-client
 CFLAGS = -O2 -Wall -Wextra -Wstrict-prototypes \
 	-I$(LIBOWLPS_DIR) -I$(LIBOWLPSCLIENT_DIR)
+#CFLAGS += -g -O0
 DEPFLAGS = -MMD
 XCFLAGS = $(CFLAGS) $(DEPFLAGS) $(WARN) $(HEADERS)
 PICFLAG = -fPIC
+OWLPSFLAGS = -D OWLPS_VERSION=\"$(OWLPS_VERSION)\"
+OWLPSFLAGS += -D DEBUG
 LIBS = -L$(LIBOWLPS_DIR) -lowlps \
 	-L$(LIBOWLPSCLIENT_DIR) -lowlps-client \
 	-lrt -lm -pthread
 STATIC_LIBS =
-OWLPSFLAGS = -D OWLPS_VERSION=\"$(OWLPS_VERSION)\"
 
 ## Cibles de compilation standard ##
 
diff --git a/owlps-ardrone/Makefile_drone b/owlps-ardrone/Makefile_drone
index 2385785..73af76c 100644
--- a/owlps-ardrone/Makefile_drone
+++ b/owlps-ardrone/Makefile_drone
@@ -1,6 +1,6 @@
 # Source version
 ifndef OWLPS_VERSION
-        OWLPS_VERSION = $(shell git describe || echo 'UNKNOWN_VERSION')
+	OWLPS_VERSION := $(shell git describe 2>/dev/null || echo 'UNKNOWN_VERSION')
 endif
 
 # Emplacement de la suite de cross-compilation
@@ -32,9 +32,12 @@ LIBOWLPS_DIR = ../libowlps
 LIBOWLPSCLIENT_DIR = ../libowlps-client
 CFLAGS = -O2 -Wall -Wextra -Wstrict-prototypes \
 	-I$(LIBOWLPS_DIR) -I$(LIBOWLPSCLIENT_DIR)
+#CFLAGS += -g -O0
 DEPFLAGS = -MMD
 XCFLAGS = $(CFLAGS) $(DEPFLAGS) $(WARN) $(HEADERS)
 PICFLAG = -fPIC
+OWLPSFLAGS = -D OWLPS_VERSION=\"$(OWLPS_VERSION)\"
+OWLPSFLAGS += -D DEBUG
 LOWLPS = -L$(LIBOWLPS_DIR) -lowlps
 LOWLPSA = $(LIBOWLPS_DIR)/libowlps.a
 LOWLPSCLIENTA = $(LIBOWLPSCLIENT_DIR)/libowlps-client.a
@@ -45,8 +48,6 @@ STATIC_LIBS = $(LOWLPSA) $(LIBS)
 LATHEROS = -L$(TOOLCHAIN_USR)/lib -L$(TOOLCHAIN_USR_2)/lib
 IATHEROS = -I$(TOOLCHAIN_USR)/include -I$(TOOLCHAIN_USR_2)/include
 LDFLAGS = $(IATHEROS) $(LATHEROS)
-OWLPSFLAGS = -D OWLPS_VERSION=\"$(OWLPS_VERSION)\"
-OWLPSFLAGS += -D DEBUG
 
 ## Cibles de compilation standard ##