--- makefile.orig	2015-07-13 15:16:24 UTC
+++ makefile
@@ -6,12 +6,11 @@
 # you will want to change the optimization level.  (For example change
 # -ggdb to -O3 or -O2.
 
-FC = /usr/bin/gfortran
-std_flags=-march=native -fimplicit-none -fno-f2c -fno-backslash\
+std_flags=-fimplicit-none -fno-f2c -fno-backslash\
  -funroll-loops  -ffpe-trap=zero,overflow,invalid -finit-real=NAN\
- -ftree-vectorize -floop-interchange -floop-strip-mine -floop-block -pipe
+ -ftree-vectorize -pipe
 
-FFLAGS = -ggdb $(std_flags) -Wall
+FFLAGS+= $(std_flags) -Wall
 #
 objm77 = $(patsubst %.f,%.o, $(wildcard *.f))
 #
@@ -20,10 +19,10 @@ all: libmath77.a
 .SUFFIXES:
 .SUFFIXES: .f .o
 %.o: %.f
-	$(FC) -c $(FFLAGS) $(FOPTS) -o $@ $*.f &>>compile.msg
+	$(FC) -c $(FFLAGS) $(FOPTS) -o $@ $*.f
 
 libmath77.a: $(objm77)
-	ar r $@ $(objm77) &>>compile.msg
+	ar r $@ $(objm77)
 
 demo: libmath77.a makefile demo/dr$(code).f
 	 $(FC) $(FFLAGS) -o demo/dr$(code) demo/dr$(code).f -L. -lmath77;\