|  | 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 | 
|  | ]) |