diff --git a/configure.ac b/configure.ac
index 8d28a8d..a522edd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -169,13 +169,13 @@ case $FC in
        IRPF90="$IRPF90 -DMPI"
        ;;
     ifort*)
-       FCFLAGS="-O3 -axT -ip"
+       FCFLAGS="-O3 -axSSE2,AVX -ip"
        if test $STATIC == 1 ; then
          FCFLAGS="$FCFLAGS -static-intel -static-libgcc -static"
        fi
        ;;
     gfortran*)
-       FCFLAGS="-O3 -ffast-math"
+       FCFLAGS="-fPIC -O3 -ffast-math"
        if test $STATIC == 0 ; then
          FCFLAGS="$FCFLAGS -static-libgcc -static"
        fi