[PATCH] XDM: Fix missing linking dependency on -ldl.

[Fernando Tarlá Cardoso Lemos]

Recent versions of GCC ship with a linker that doesn't add the deps
of the DSOs to the linking process. This behavior is also found in
GNU gold. This change fixes building with those linkers.

Some references:

http://wiki.debian.org/ToolChain/DSOLinking
https://fedoraproject.org/wiki/UnderstandingDSOLinkChange
---
 configure.ac |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/configure.ac b/configure.ac
index 39a3655..e22aa43 100644
--- a/configure.ac
+++ b/configure.ac
@@ -79,6 +79,9 @@ AM_CONDITIONAL(HAVE_ARC4RANDOM, test x$HAVE_ARC4RANDOM = xyes)
 
 # Function crypt() comes from the C library or the -lcrypt data encryption library
 AC_SEARCH_LIBS(crypt, crypt)
+
+# Function dl() comes from the C library or -ldl
+AC_SEARCH_LIBS([dlopen], [dl])
 #------------------------------------------------------------------------------
 
 # Checks for header files.
-- 
1.7.4.1