diff -ura avl.orig/bin/Makefile.gfortran avl.new/bin/Makefile.gfortran
--- avl.orig/bin/Makefile.gfortran	2017-02-12 11:25:41.000000000 -0800
+++ avl.new/bin/Makefile.gfortran	2017-03-30 17:31:47.645245947 -0700
@@ -66,7 +66,7 @@
 ##  Uncomment for gfortran
 FC = gfortran
 OPT = -O
-DP =
+#DP =
 ACHK =
 
 PLTLIB = -L/usr/X11R6/lib -lX11
@@ -77,14 +77,14 @@
 #ACHK = -fbounds-check -finit-real=inf
 #ACHK = -fbounds-check -finit-real=inf -ffpe-trap=invalid,zero,denormal
 
-PLTOBJ = ../plotlib/libPlt_gSP.a
-EIGOBJ = ../eispack/libeispack.a
+#PLTOBJ = ../plotlib/libPlt_gSP.a
+#EIGOBJ = ../eispack/libeispack.a
 
 ##--------------------------
 # double precision (compile appropriate eispack and libPlt)
-#DP = -fdefault-real-8
-#PLTOBJ = ../plotlib/libPlt_gDP.a
-#EIGOBJ = ../eispack/libeispackDP.a
+DP = -fdefault-real-8 -fdefault-double-8
+PLTOBJ = ../plotlib/libPlt_gDP.a
+EIGOBJ = ../eispack/libeispack_gDP.a
 ##--------------------------
 
 # use -m32 for 32-bit binary, -m64 for 64-bit (check your system!)
@@ -110,7 +110,6 @@
 
 avl: $(AOBJS)
 	$(FC) -o avl $(AOBJS)  $(ALIBS) $(PLTOBJ) $(EIGOBJ) $(PLTLIB) $(FTNLIB) $(LFLG)
-	$(INSTALLCMD) avl $(BINDIR)
 
 dtest: dtest.o
 	$(FC) -o dtest dtest.o $(LFLG)
diff -ura avl.orig/eispack/Makefile.gfortran avl.new/eispack/Makefile.gfortran
--- avl.orig/eispack/Makefile.gfortran	2014-05-22 09:51:00.000000000 -0700
+++ avl.new/eispack/Makefile.gfortran	2017-03-30 17:33:32.799291332 -0700
@@ -7,8 +7,8 @@
 DP =
 EISLIB = libeispack.a
 
-#DP = -fdefault-real-8
-#EISLIB = eispack_gDP.a
+DP = -fdefault-real-8 -fdefault-double-8
+EISLIB = libeispack_gDP.a
 
 
 $(EISLIB): eispack.f
diff -ura avl.orig/plotlib/config.make.gfortranDP avl.new/plotlib/config.make.gfortranDP
--- avl.orig/plotlib/config.make.gfortranDP	2017-02-12 11:20:53.000000000 -0800
+++ avl.new/plotlib/config.make.gfortranDP	2017-03-30 17:36:16.585592359 -0700
@@ -28,11 +28,11 @@
 # to gcc/gfortran to give a compatible binary 32 bit or 64 bit 
 # use -m32 for 32 bit binary, -m64 for 64 bit binary
 MARCH =
-#MARCH = -m64
+MARCH = -m64
 
 # Fortran double precision (real) flag
 DP =
-DP = -fdefault-real-8
+DP = -fdefault-real-8 -fdefault-double-8
 
 FFLAGS  = -O2 $(MARCH) $(DP)
 CFLAGS  = -O2 $(MARCH) $(DEFINE)