+AC_CACHE_CHECK(if $cf_cv_screen library uses pthreads,cf_cv_use_pthreads,[
+AC_TRY_LINK([
+#include <${cf_cv_ncurses_header:-curses.h}>
+extern void _nc_init_pthreads(void);
+],
+[
+ initscr();
+ _nc_init_pthreads();
+ ],
+ [cf_cv_use_pthreads=yes],
+ [cf_cv_use_pthreads=no])
+])
+test $cf_cv_use_pthreads = yes && AC_DEFINE(USE_PTHREADS)
+