diff --git a/sysdeps/unix/sysv/linux/configure b/sysdeps/unix/sysv/linux/configure
old mode 100644
new mode 100755
index 4d642e953b..8cda8e9451
--- a/sysdeps/unix/sysv/linux/configure
+++ b/sysdeps/unix/sysv/linux/configure
@@ -1,3 +1,4 @@
+ac_default_prefix=/usr
 # This file is generated from configure.ac by Autoconf.  DO NOT EDIT!
  # Local configure fragment for sysdeps/unix/sysv/linux.
 
@@ -116,7 +117,9 @@ if test -n "$sysheaders"; then
   CPPFLAGS=$OLD_CPPFLAGS
 fi
 
-if test "$prefix" = "/usr/local" -o "$prefix" = "/usr/local/" -o "$prefix" = "NONE"; then
+
+
+if test "$prefix" = "/usr/local" -o "$prefix" = "/usr/local/"; then
   if test $enable_sanity = yes; then
     echo "\
 *** On GNU/Linux systems the GNU C Library should not be installed into
diff --git a/sysdeps/unix/sysv/linux/configure.ac b/sysdeps/unix/sysv/linux/configure.ac
index c177e082a9..4c43cda877 100644
--- a/sysdeps/unix/sysv/linux/configure.ac
+++ b/sysdeps/unix/sysv/linux/configure.ac
@@ -71,7 +71,9 @@ if test -n "$sysheaders"; then
   CPPFLAGS=$OLD_CPPFLAGS
 fi
 
-if test "$prefix" = "/usr/local" -o "$prefix" = "/usr/local/" -o "$prefix" = "NONE"; then
+AC_PREFIX_DEFAULT([/usr])
+
+if test "$prefix" = "/usr/local" -o "$prefix" = "/usr/local/"; then
   if test $enable_sanity = yes; then
     echo "\
 *** On GNU/Linux systems the GNU C Library should not be installed into