--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Makefile	Tue Jul 23 01:48:31 2024 +0900
@@ -0,0 +1,20 @@
+All: rkmain.exe rksub.so
+
+clean:
+	rm *.so *.o *.mod *.exe
+
+rksub.so: rksub.f90 rkmain.o rkmod.o rungekutta.o
+	R CMD SHLIB rksub.f90 rkmain.o rkmod.o rungekutta.o
+
+rkmain.exe: rkmain.o rkmod.o rungekutta.o
+	gfortran -o rkmain.exe rkmain.o rkmod.o rungekutta.o
+
+rkmain.o: rkmain.f90 rkmod.o rungekutta.o
+	gfortran -c rkmain.f90
+
+rkmod.o: rkmod.f90 rungekutta.o
+	gfortran -c rkmod.f90
+
+rungekutta.o: rungekutta.f90
+	gfortran -c rungekutta.f90
+