Add missing block delimiters to AC_ARG_WITH, should fix #329

configure.ac

@@ -282,7 +282,8 @@ AM_CONDITIONAL([HAVE_DNSTAP], test "$opt_dnstap" != "no")
 dnl Check for LMDB
 AC_ARG_WITH([lmdb],
     AC_HELP_STRING([--with-lmdb=[DIR]], [Link with external LMDB]),[
-    with_lmdb=$withval,
+    with_lmdb=$withval
+    ],[
     with_lmdb=yes
     ])