Merged upstream in 0.7.0
diff -up dionaea-1748f3b3936aa1da2d92500251ae8010fe181dfc/configure.ac.fix_obsolete_macros dionaea-1748f3b3936aa1da2d92500251ae8010fe181dfc/configure.ac
--- dionaea-1748f3b3936aa1da2d92500251ae8010fe181dfc/configure.ac.fix_obsolete_macros   2018-03-26 12:08:28.000000000 +0200
+++ dionaea-1748f3b3936aa1da2d92500251ae8010fe181dfc/configure.ac       2018-04-07 14:42:03.306757293 +0200
@@ -25,7 +25,7 @@ AC_C_BIGENDIAN
 # Checks for programs.
 AC_PROG_CC
 AC_PROG_MAKE_SET
-AC_PROG_LIBTOOL
+LT_INIT
 
 AC_CHECK_HEADERS([stdint.h stdlib.h string.h strings.h unistd.h netpacket/packet.h execinfo.h linux/sockios.h])