From 650285d5be2aacd9c0e60260563dd0235b729af7 Mon Sep 17 00:00:00 2001
From: Jason Evans <je@fb.com>
Date: Mon, 19 Mar 2012 10:25:27 -0700
Subject: [PATCH] Generalize dlsym() configuration.

Generalize dlsym() configuration to succeed if dlsym() is in libc rather
than libdl.
---
 configure.ac | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index b92a7491..76cb6700 100644
--- a/configure.ac
+++ b/configure.ac
@@ -777,8 +777,10 @@ fi
 )
 if test "x$enable_lazy_lock" = "x1" ; then
   AC_CHECK_HEADERS([dlfcn.h], , [AC_MSG_ERROR([dlfcn.h is missing])])
-  AC_CHECK_LIB([dl], [dlopen], [LIBS="$LIBS -ldl"],
-               [AC_MSG_ERROR([libdl is missing])])
+  AC_CHECK_FUNC([dlsym], [],
+    [AC_CHECK_LIB([dl], [dlsym], [LIBS="$LIBS -ldl"],
+                  [AC_MSG_ERROR([libdl is missing])])
+    ])
   AC_DEFINE([JEMALLOC_LAZY_LOCK], [ ])
 fi
 AC_SUBST([enable_lazy_lock])