--- include/curses.h.in.dist	2003-07-30 15:13:01.000000000 +0200
+++ include/curses.h.in	2003-07-30 15:15:08.000000000 +0200
@@ -115,6 +115,9 @@
  * Otherwise, let it remain a typedef to avoid conflicts with other #define's.
  * In either case, make a typedef for NCURSES_BOOL which can be used if needed
  * from either C or C++.
+ *
+ * We have <stdbool.h> if and only if we are a ISO C 9x compiler. A configure
+ * time check is not sufficient.
  */
 
 #undef TRUE
@@ -127,13 +130,13 @@
 
 #if @USE_CXX_BOOL@ /* !__cplusplus, etc. */
 
-#if @cf_cv_header_stdbool_h@
+#if defined(__STDC__) && (__STDC_VERSION__ >= 199901L)
 #include <stdbool.h>
 #endif
 
 #undef bool
 
-#if @cf_cv_header_stdbool_h@
+#if defined(__STDC__) && (__STDC_VERSION__ >= 199901L)
 #define bool NCURSES_BOOL
 #else
 typedef NCURSES_BOOL bool;