diff --git a/conf/autopilot/subsystems/fixedwing/autopilot.makefile b/conf/autopilot/subsystems/fixedwing/autopilot.makefile
index e5b985c3258..16c9df0af23 100644
--- a/conf/autopilot/subsystems/fixedwing/autopilot.makefile
+++ b/conf/autopilot/subsystems/fixedwing/autopilot.makefile
@@ -215,7 +215,7 @@ jsbsim.srcs 		+= $(SIMDIR)/sim_ac_jsbsim.c $(SIMDIR)/sim_ac_fw.c $(SIMDIR)/sim_a
 
 # external libraries
 jsbsim.CFLAGS 		+= -I$(SIMDIR) -I/usr/include -I$(JSBSIM_INC) -I$(OCAMLLIBDIR) `pkg-config glib-2.0 --cflags`
-jsbsim.LDFLAGS		+= `pkg-config glib-2.0 --libs` -lm -lpcre -lglibivy -L/usr/lib -lJSBSim
+jsbsim.LDFLAGS		+= `pkg-config glib-2.0 --libs` -lglibivy -lm -L/usr/lib -lJSBSim
 
 jsbsim.CFLAGS 		+= -DDOWNLINK -DDOWNLINK_TRANSPORT=IvyTransport
 jsbsim.srcs 		+= downlink.c $(SRC_FIRMWARE)/datalink.c $(SRC_ARCH)/jsbsim_hw.c $(SRC_ARCH)/jsbsim_ir.c $(SRC_ARCH)/jsbsim_gps.c $(SRC_ARCH)/ivy_transport.c $(SRC_ARCH)/jsbsim_transport.c
diff --git a/conf/autopilot/subsystems/rotorcraft/fdm_nps.makefile b/conf/autopilot/subsystems/rotorcraft/fdm_nps.makefile
index 1ddafe759cc..491150d7ebb 100644
--- a/conf/autopilot/subsystems/rotorcraft/fdm_nps.makefile
+++ b/conf/autopilot/subsystems/rotorcraft/fdm_nps.makefile
@@ -21,7 +21,7 @@ sim.ARCHDIR = $(ARCH)
 
 sim.CFLAGS  += -DSITL -DUSE_NPS
 sim.CFLAGS  += `pkg-config glib-2.0 --cflags`
-sim.LDFLAGS += `pkg-config glib-2.0 --libs` -lm -lpcre -lglibivy -lgsl -lgslcblas
+sim.LDFLAGS += `pkg-config glib-2.0 --libs` -lm -lglibivy -lgsl -lgslcblas
 sim.CFLAGS  += -I$(NPSDIR) -I$(SRC_FIRMWARE) -I$(SRC_BOARD) -I../simulator -I$(PAPARAZZI_HOME)/conf/simulator/nps
 
 # use the paparazzi-jsbsim package if it is installed, otherwise look for JSBsim under /opt/jsbsim