From e4b2847d3135a024c740d25f9e11da7ff0bf0fd6 Mon Sep 17 00:00:00 2001
From: Bernard Spil <Sp1l@users.noreply.github.com>
Date: Sat, 6 Feb 2016 14:36:27 +0100
Subject: [PATCH] Don't check for dlopen/libdl on *BSD

This makes linking fail on -ldl as there is no libdl on in /usr/lib or /usr/local/lib on *BSD
Tested (and part of the proposed nghttp2 1.7.0) on [https://reviews.freebsd.org/D5218|FreeBSD]
---
 configure.ac | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index 09a25384..4a4defe9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -268,9 +268,16 @@ if test "x${have_zlib}" = "xno"; then
 fi
 
 # dl: openssl requires libdl when it is statically linked.
-save_LIBS=$LIBS
-AC_SEARCH_LIBS([dlopen], [dl], [APPLDFLAGS="-ldl $APPLDFLAGS"], [], [])
-LIBS=$save_LIBS
+case "${host_os}" in
+  *bsd*)
+    # dlopen is in libc on *BSD
+    ;;
+  *)
+    save_LIBS=$LIBS
+    AC_SEARCH_LIBS([dlopen], [dl], [APPLDFLAGS="-ldl $APPLDFLAGS"], [], [])
+    LIBS=$save_LIBS
+    ;;
+esac
 
 # cunit
 PKG_CHECK_MODULES([CUNIT], [cunit >= 2.1], [have_cunit=yes], [have_cunit=no])