* Check for libdl via dlopen and rerun autotools

autotools/includes/acinclude.m4

@@ -361,7 +361,7 @@ AC_DEFUN([EGG_CHECK_LIBS],
 [
   AC_CHECK_LIB(socket, socket)
 #  AC_CHECK_LIB(nsl, connect)
-#  AC_CHECK_LIB(dl, dlopen)
+  AC_CHECK_LIB(dl, dlopen)
 #  AC_CHECK_LIB(nsl, gethostbyname)
 #  AC_CHECK_LIB(dns, gethostbyname)
 

configure

@@ -4582,7 +4582,51 @@ _ACEOF
 fi
 
 #  AC_CHECK_LIB(nsl, connect)
-#  AC_CHECK_LIB(dl, dlopen)
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for dlopen in -ldl" >&5
+$as_echo_n "checking for dlopen in -ldl... " >&6; }
+if test "${ac_cv_lib_dl_dlopen+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-ldl  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char dlopen ();
+int
+main ()
+{
+return dlopen ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_link "$LINENO"; then :
+  ac_cv_lib_dl_dlopen=yes
+else
+  ac_cv_lib_dl_dlopen=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_dl_dlopen" >&5
+$as_echo "$ac_cv_lib_dl_dlopen" >&6; }
+if test "x$ac_cv_lib_dl_dlopen" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBDL 1
+_ACEOF
+
+  LIBS="-ldl $LIBS"
+
+fi
+
 #  AC_CHECK_LIB(nsl, gethostbyname)
 #  AC_CHECK_LIB(dns, gethostbyname)