From: Göktürk Yüksek <gokturk@binghamton.edu>
Subject: [PATCH] Fix automagic dependency on libtecla

Replace the unconditional AC_CHECK_LIB logic with AC_ARG_WITH to
eliminate the automagic dependency on libtecla.

--- a/configure.ac
+++ b/configure.ac
@@ -164,8 +164,11 @@
 AC_CHECK_LIB([kstat], [kstat_open])
 # Use libtecla for autocompletion if it is available. If it
 # is, then conditionally compile auto_comp.c (see Makefile.am)
-AC_CHECK_LIB([tecla], [cpl_add_completion])
-AM_CONDITIONAL(AUTOCOMP_LIBTECLA, test "$ac_cv_lib_tecla_cpl_add_completion" = yes)
+AC_ARG_WITH([libtecla], AS_HELP_STRING([--with-libtecla], [Build with libtecla for autocompletion support (default: test)]))
+AS_IF([test "x$with_libtecla" != "xno"], [
+	AC_CHECK_LIB([tecla], [cpl_add_completion])
+])
+AM_CONDITIONAL([AUTOCOMP_LIBTECLA], [test "x$ac_cv_lib_tecla_cpl_add_completion" = "xyes"])
 # Check that librt is installed and supports async IO. First line
 # allows to add librt to the linkers path, second one checks
 # if aio_wait() is in it, third one checks if aio_waitn() is there (usually