From 1b896582a0cd74854f99e08854554807a8f1f764 Mon Sep 17 00:00:00 2001
From: Mike Frysinger <vapier@gentoo.org>
Date: Tue, 22 May 2012 14:12:23 -0400
Subject: [PATCH] link against -ldl when -lltdl is not available

If ltdl isn't found, the code will use dlopen if it's available.
But it won't link to -ldl which can cause link errors like so:

  CCLD   opensc-tool
../../src/libopensc/.libs/libopensc.so: error: undefined reference to 'dlopen'
../../src/libopensc/.libs/libopensc.so: error: undefined reference to 'dlsym'
../../src/libopensc/.libs/libopensc.so: error: undefined reference to 'dlerror'
../../src/libopensc/.libs/libopensc.so: error: undefined reference to 'dlclose'
collect2: ld returned 1 exit status
make[3]: *** [opensc-tool] Error 1

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
---
 configure.ac |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/configure.ac b/configure.ac
index 2751f0f..123aeb1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -277,6 +277,13 @@ if test -z "${LTLIB_LIBS}"; then
 		[LTLIB_LIBS="-lltdl"]
 	)
 fi
+if test -z "${LTLIB_LIBS}"; then
+	AC_CHECK_LIB(
+		[dl],
+		[dlopen],
+		[LTLIB_LIBS="-ldl"]
+	)
+fi
 
 saved_CFLAGS="${CFLAGS}"
 CFLAGS="${CFLAGS} ${LTLIB_CFLAGS}"
-- 
1.7.8.6