diff --git a/Makefile b/Makefile
index bf5cf1b..ec1d82c 100644
--- a/Makefile
+++ b/Makefile
@@ -3,21 +3,24 @@
 LIB = dfftpack
 
 FC = gfortran
-FFLAGS = -O2
+FFLAGS = -O2 -fPIC
 
 export LIB
 export FC
 export FFLAGS
 
-.PHONY: all clean test
+.PHONY: build clean test
 
-all:
-	$(MAKE) -f Makefile --directory=src
-	$(MAKE) -f Makefile --directory=test
+build:
+	$(MAKE) -f Makefile $@ --directory=src
 
-test:
-	$(MAKE) -f Makefile --directory=test
+test: build
+	$(MAKE) -f Makefile $@ --directory=test
+	
+bench: build
+	$(MAKE) -f Makefile $@ --directory=example
 
 clean:
-	$(MAKE) -f Makefile clean --directory=src
-	$(MAKE) -f Makefile clean --directory=test
\ No newline at end of file
+	$(MAKE) -f Makefile $@ --directory=src
+	$(MAKE) -f Makefile $@ --directory=test
+	$(MAKE) -f Makefile $@ --directory=example
\ No newline at end of file
diff --git a/README.md b/README.md
index b9057ae..6728590 100644
--- a/README.md
+++ b/README.md
@@ -31,6 +31,7 @@ fftpack = { git="https://github.com/fortran-lang/fftpack.git" }
 Alternatively, you can build using provided `Makefile`:
 ```bash
 make
+make test
 ```
 
 ## Links
diff --git a/example/Makefile b/example/Makefile
new file mode 100644
index 0000000..839aac4
--- /dev/null
+++ b/example/Makefile
@@ -0,0 +1,18 @@
+SRCF90 = \
+	bench1.f90
+
+OBJ = $(SRCF90:%.f90=%.o) 
+
+build: bench1.x
+
+bench: build
+	./bench1.x
+
+bench1.x: $(OBJ)
+	$(FC) $(FFLAGS) $(OBJ) -L../src -l$(LIB) -I../src -o $@
+
+%.o: %.f90
+	$(FC) $(FFLAGS) -I../src -c $<
+
+clean:
+	rm -f -r *.o *.x
diff --git a/src/Makefile b/src/Makefile
index df591a2..e334312 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1,4 +1,4 @@
-SRCF = \
+SRCF90 = \
 	zfftb.f90\
 	cfftb1.f90\
 	zfftf.f90\
@@ -47,9 +47,7 @@ SRCF = \
 	dsinqi.f90\
 	dsint.f90\
 	sint1.f90\
-	dsinti.f90
-
-SRCF90 = \
+	dsinti.f90\
 	fftpack.f90\
 	fftpack_fft.f90\
 	fftpack_ifft.f90\
@@ -59,16 +57,20 @@ SRCF90 = \
 	fftpack_ifftshift.f90\
 	fftpack_qct.f90\
 	fftpack_iqct.f90\
-	fftpack_dct.f90\
+	fftpack_dct.f90
+
+SRCFPP = \
 	rk.F90
 
-OBJF := $(SRCF:.f90=.o)
-OBJF90 := $(SRCF90:.f90=.o)
+OBJ = $(SRCF90:.f90=.o)
+OBJ += $(SRCFPP:.F90=.o)
+
+build: lib$(LIB).a lib$(LIB).so
 
-lib$(LIB).a: $(OBJF) $(OBJF90)
-	ar -rcs lib$(LIB).a $(OBJF) $(OBJF90)
+lib$(LIB).a: $(OBJ)
+	ar -rcs lib$(LIB).a $(OBJ)
 
-shared: $(OBJ)
+lib$(LIB).so: $(OBJ)
 	$(FC) -shared -o lib$(LIB).so $(OBJ)
 
 clean:
diff --git a/test/Makefile b/test/Makefile
index 51dac52..35a8e31 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -1,29 +1,33 @@
 FETCH = curl -L
 
-SRC = \
+SRCF90 = \
 	test_fftpack_fft.f90 \
 	test_fftpack_rfft.f90 \
-	test_fftpack_qct.f90 \
-	test_fftpack_dct.f90 \
 	test_fftpack_utils.f90 \
-	test_fftpack.f90 \
+	test_fftpack.f90
+
+SRCFPP = \
+	test_fftpack_qct.F90 \
+	test_fftpack_dct.F90 \
 	testdrive.F90
-	
-OBJ = $(SRC:.f90=.o)
-OBJ := $(OBJ:.F90=.o)
 
-all: tstfft \
-	test_fftpack
+OBJ = $(SRCF90:%.f90=%.o) 
+OBJ += $(SRCFPP:%.F90=%.o)
+
+build: tstfft.x \
+	test_fftpack.x
+	
+test: build
+	./tstfft.x
+	./test_fftpack.x
 
 # Orginal test
-tstfft: tstfft.f
-	$(FC) $(FFLAGS) $< -L../src -l$(LIB) -I../src -o $@.x
-	time ./tstfft.x
+tstfft.x: tstfft.f
+	$(FC) $(FFLAGS) $< -L../src -l$(LIB) -I../src -o $@
 
 # `fftpack` fft routines
-test_fftpack: $(OBJ)
-	$(FC) $(FFLAGS) $(OBJ) -L../src -l$(LIB) -I../src -o $@.x
-	./test_fftpack.x
+test_fftpack.x: $(OBJ)
+	$(FC) $(FFLAGS) $(OBJ) -L../src -l$(LIB) -I../src -o $@
 	
 testdrive.F90:
 	$(FETCH) https://github.com/fortran-lang/test-drive/raw/v0.4.0/src/testdrive.F90 > $@