$NetBSD: patch-src_configure.ac,v 1.2 2016/05/29 22:32:12 abs Exp $

Check for dlopen using autoconf rather than hardcoding it in src/Makefile.in.
Plus add an option to disable gitcheck

--- configure.ac.orig	2015-09-09 19:27:51.000000000 +0000
+++ configure.ac
@@ -22,6 +22,12 @@ AC_ARG_ENABLE(openssl,
         [ac_enable_openssl="no"]
 )
 
+AC_ARG_ENABLE(gitcheck,
+        [AS_HELP_STRING([--disable-gitcheck], [Disable Git check, default: enabled])],
+        [ac_enable_gitcheck="$enableval"],
+        [ac_enable_gitcheck="yes"]
+)
+
 # Define necessary build flags
 AC_GNU_SOURCE
 AC_USE_SYSTEM_EXTENSIONS
@@ -73,10 +79,13 @@ AC_FUNC_FORK
 AC_PROG_GCC_TRADITIONAL
 AC_FUNC_SELECT_ARGTYPES
 AC_CHECK_FUNCS([atexit memset poll socket strerror])
+AC_SEARCH_LIBS([dlopen], [dl dld], [], [
+  AC_MSG_ERROR([unable to find the dlopen() function])
+])
 
 # Check if user has downloaded a GitHub ZIP file and attempt to fix it.
 AC_MSG_CHECKING([status of GIT submodules])
-if test ! -e libite/lite.h; then
+if test "$ac_enable_gitcheck" = "yes" -a ! -e libite/lite.h; then
     AC_MSG_RESULT([Missing!])
     AC_MSG_CHECKING([if we can update all submodules])
     run=`git submodule update --init`