--- a/Mkinclude.in
+++ b/Mkinclude.in
@@ -14,7 +14,7 @@
 
 # suffix rules
 
-.SUFFIXES : .o .f .c
+.SUFFIXES : .o .f .c .f90
 
 .c.o :
 	$(CC) $(DEFS) $(CFLAGS) -c $<
@@ -22,12 +22,19 @@
 .f.o :
 	$(FC) $(FFLAGS) -c $<
 
+.f90.o :
+	$(FC) $(FFLAGS) -c $<
+
 .c :
 	$(CC) $(CFLAGS) -o $@ $< $(LDFLAGS) $(LDLIBS)
 
 .f :
 	$(FC) $(FFLAGS) -o $@ $< $(LDFLAGS) $(LDLIBS)
 
+.f90 :
+	$(FC) $(FFLAGS) -o $@ $< $(LDFLAGS) $(LDLIBS)
+
+
 # macro definitions
 
 prefix		= @prefix@
