--- configure.orig	2023-02-04 10:09:53 UTC
+++ configure
@@ -3394,13 +3394,6 @@ printf "%s\n" "#define _NETBSD_SOURCE 1" >>confdefs.h
 
 
 # The later defininition of _XOPEN_SOURCE and _POSIX_C_SOURCE disables
-# certain features on FreeBSD, so we need __BSD_VISIBLE to re-enable
-# them.
-
-printf "%s\n" "#define __BSD_VISIBLE 1" >>confdefs.h
-
-
-# The later defininition of _XOPEN_SOURCE and _POSIX_C_SOURCE disables
 # u_int on Irix 5.3. Defining _BSD_TYPES brings it back.
 
 printf "%s\n" "#define _BSD_TYPES 1" >>confdefs.h
@@ -3785,9 +3778,8 @@ printf "%s\n" "#define _BSD_SOURCE 1" >>confdefs.h
   # but used in struct sockaddr.sa_family. Reported by Tim Rice.
   SCO_SV/3.2)
     define_xopen_source=no;;
-  # On FreeBSD 4, the math functions C89 does not cover are never defined
-  # with _XOPEN_SOURCE and __BSD_VISIBLE does not re-enable them.
-  FreeBSD/4.*)
+  # On FreeBSD, defining _XOPEN_SOURCE to 600 requests a strict environment.
+  FreeBSD/*)
     define_xopen_source=no;;
   # On MacOS X 10.2, a bug in ncurses.h means that it craps out if
   # _XOPEN_EXTENDED_SOURCE is defined. Apparently, this is fixed in 10.3, which