By report autoconf 2.71 works, 2.70 is known to have compatibility issues.

diff --git a/autogen.sh b/autogen.sh
index edc6c40fa21e0008b5b6d4eae292ed30404c4d6b..0365a10165f105d4c6198c1508c90f7f5e162709 100755 (executable)
--- a/autogen.sh
+++ b/autogen.sh
@@ -38,9 +38,11 @@ fi
 case $autoversion in
     *' '2.6[5-9])
        ;;
+    *' '2.71)
+       ;;
     *)
        echo "This autoconf version is not supported by LyX."
-       echo "LyX only supports autoconf 2.65-2.69."
+       echo "LyX only supports autoconf 2.65-2.69, 2.71."
        exit 1
        ;;
 esac