-stdbool [test $ac_cv_func_isapipe = no]
-sys_stat [test $ac_cv_func_isapipe = no]
-unistd [test $ac_cv_func_isapipe = no]
+stdbool [test $HAVE_ISAPIPE = 0]
+sys_stat [test $HAVE_ISAPIPE = 0]
+unistd [test $HAVE_ISAPIPE = 0]
+msvc-nothrow [test $HAVE_ISAPIPE = 0]
+fstat [test $HAVE_ISAPIPE = 0]