| AC_DEFUN([AC_PLUGINS], | 
 | [ | 
 |   maybe_plugins=no | 
 |   AC_CHECK_HEADERS([dlfcn.h], [maybe_plugins=yes], [], [AC_INCLUDES_DEFAULT]) | 
 |   AC_CHECK_HEADERS([windows.h], [maybe_plugins=yes], [], [AC_INCLUDES_DEFAULT]) | 
 |  | 
 |   AC_ARG_ENABLE([plugins], | 
 |     AS_HELP_STRING([--enable-plugins], [Enable support for plugins]), | 
 |     [case "${enableval}" in | 
 |       no) plugins=no ;; | 
 |       *) plugins=yes | 
 |          if test "$maybe_plugins" != "yes" ; then | 
 | 	   AC_MSG_ERROR([Building with plugin support requires a host that supports dlopen.]) | 
 | 	 fi ;; | 
 |      esac], | 
 |     [plugins=$maybe_plugins] | 
 |   ) | 
 |   if test "$plugins" = "yes"; then | 
 |     AC_SEARCH_LIBS([dlsym], [dl]) | 
 |   fi | 
 | ]) |