Index: configure
--- configure.orig
+++ configure
@@ -350,6 +350,9 @@ case "${ostype}" in
     darwin)
 	defconfigh "_DARWIN_C_SOURCE"
 	;;
+    openbsd)
+	defconfigh "_BSD_SOURCE"
+	;;
     sunos)
 	defconfigh "__EXTENSIONS__"
 	;;
@@ -746,6 +749,7 @@ END
 	checking "for ${i%:*}"
 	cat >"${tempsrc}" <<END
 ${confighdefs}
+#include <stdio.h>
 #if HAVE_CURSES_H
 #include <curses.h>
 #elif HAVE_NCURSES_H
@@ -756,8 +760,6 @@ ${confighdefs}
 #include <ncursesw/ncurses.h>
 #endif
 #include <${i%:*}>
-int putchar(int);
-
 int main(void) {
 /* Undeclared identifiers are a syntax error in C99, but many compilers assume
  * implicit declarations when they appear in a function call. We force compilers