Fixing example compilation

example/Numerics/PSE/1_Derivative_approx_1D_mp/Makefile

+# This example does not work using clang
+# Eliminate the comment to activate it
+
 include ../../../example.mk
 
 CC=mpic++
@@ -9,15 +12,15 @@ OBJ_128 = main_float128.o
 %.o: %.cpp
 	$(CC) -O3 -c --std=c++11 -o $@ $< $(INCLUDE_PATH)
 
-pse_1d_128: $(OBJ_128)
-	$(CC) -o $@ $^ $(CFLAGS) $(LIBS_PATH) $(LIBS) -lquadmath
+# pse_1d_128: $(OBJ_128)
+# 	$(CC) -o $@ $^ $(CFLAGS) $(LIBS_PATH) $(LIBS) -lquadmath
 
-all: pse_1d_128
+#all: pse_1d_128
 
-run: all
-	source $$HOME/openfpm_vars; ./pse_1d_128
+#run: all
+#	source $$HOME/openfpm_vars; ./pse_1d_128
 
-.PHONY: clean all run
+#.PHONY: clean all run
 
 clean:
 	rm -f *.o *~ core pse_1d_128