+AC_SEARCH_LIBS([gluPerspective], [GLU],,
+ [AC_MSG_ERROR([libGLU is required])])
+
+AC_SEARCH_LIBS([alGenBuffers], [openal],,
+ [AC_MSG_ERROR([libopenal is required])])
+
+AC_SEARCH_LIBS([alutInit], [alut],,
+ [AC_MSG_ERROR([libalut is required])])
+