Enable extended attribute support for NetBSD

--- configure.ac.orig	2015-08-31 16:52:47.000000000 +0200
+++ configure.ac	2015-08-31 16:53:23.000000000 +0200
@@ -1060,8 +1060,15 @@
 	AC_DEFINE(SUPPORT_XATTRS, 1)
 	AC_DEFINE(NO_SYMLINK_USER_XATTRS, 1, [True if symlinks do not support user xattrs])
 	AC_CHECK_LIB(attr,getxattr)
 	;;
+    *netbsd*)
+	AC_MSG_RESULT(Using NetBSD xattrs)
+	AC_DEFINE(HAVE_LINUX_XATTRS, 1, [True if you have NetBSD xattrs])
+	AC_DEFINE(SUPPORT_XATTRS, 1)
+	AC_DEFINE(NO_SYMLINK_USER_XATTRS, 1, [True if symlinks do not support user xattrs])
+	AC_CHECK_LIB(attr,getxattr)
+	;;
     darwin*)
 	AC_MSG_RESULT(Using OS X xattrs)
 	AC_DEFINE(HAVE_OSX_XATTRS, 1, [True if you have Mac OS X xattrs])
 	AC_DEFINE(SUPPORT_XATTRS, 1)
--- configure.sh.orig	2015-08-31 16:52:52.000000000 +0200
+++ configure.sh	2015-08-31 16:54:46.000000000 +0200
@@ -8924,8 +8924,65 @@
 
 fi
 
 	;;
+    *netbsd*)
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: Using NetBSD xattrs" >&5
+$as_echo "Using NetBSD xattrs" >&6; }
+
+$as_echo "#define HAVE_LINUX_XATTRS 1" >>confdefs.h
+
+	$as_echo "#define SUPPORT_XATTRS 1" >>confdefs.h
+
+
+$as_echo "#define NO_SYMLINK_USER_XATTRS 1" >>confdefs.h
+
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for getxattr in -lattr" >&5
+$as_echo_n "checking for getxattr in -lattr... " >&6; }
+if ${ac_cv_lib_attr_getxattr+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lattr  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char getxattr ();
+int
+main ()
+{
+return getxattr ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_attr_getxattr=yes
+else
+  ac_cv_lib_attr_getxattr=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_attr_getxattr" >&5
+$as_echo "$ac_cv_lib_attr_getxattr" >&6; }
+if test "x$ac_cv_lib_attr_getxattr" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBATTR 1
+_ACEOF
+
+  LIBS="-lattr $LIBS"
+
+fi
+
+	;;
     darwin*)
 	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: Using OS X xattrs" >&5
 $as_echo "Using OS X xattrs" >&6; }