diff --git a/configure.ac b/configure.ac
index 2672739018..4292f5f5f1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -911,6 +911,7 @@ AC_CHECK_LIB([sec], [fgetspent], [
 
 AC_CHECK_DECLS(getloadavg)
 AC_FUNC_GETLOADAVG
+AC_FUNC_ALLOCA
 
 AC_C_BIGENDIAN
 AC_CHECK_HEADERS([endian.h])
diff --git a/libntech b/libntech
index b05a7a3d16..4933495683 160000
--- a/libntech
+++ b/libntech
@@ -1 +1 @@
-Subproject commit b05a7a3d1664bbc5ec7b029071cb54a80154c925
+Subproject commit 4933495683e05724a537ffbf979a927dcf06db9d