--- common/autoconf/basics.m4.orig
+++ common/autoconf/basics.m4
@@ -448,7 +448,7 @@ AC_DEFUN_ONCE([BASIC_SETUP_OUTPUT_DIR],
       files_present=`$LS $OUTPUT_ROOT`
       # Configure has already touched config.log and confdefs.h in the current dir when this check
       # is performed.
-      filtered_files=`$ECHO "$files_present" | $SED -e 's/config.log//g' -e 's/confdefs.h//g' -e 's/ //g' \
+      filtered_files=`$ECHO "$files_present" | $SED -e 's/config.log//g' -e 's/confdefs.h//g' -e 's,aclocal-copy,,g' -e 's/ //g' \
       | $TR -d '\n'`
       if test "x$filtered_files" != x; then
         AC_MSG_NOTICE([Current directory is $CURDIR.])