$NetBSD: patch-configure,v 1.2 2017/07/11 14:16:23 jaapb Exp $

Proper operating system detection
--- configure.orig	2015-11-09 21:21:45.000000000 +0000
+++ configure	2017-07-10 16:23:00.447649770 +0000
@@ -307,6 +307,14 @@
             arch='i686'
         fi
 	;;
+    i386-*freebsd* | i386-*netbsd* | i386-*dragonfly*)
+        ccdef="-DZ_ELF -DZ_DOT_LABEL_PREFIX $ccdef"
+        arch='i686'
+	;;
+    amd64-*freebsd* | amd64-*netbsd* | x86_64-*dragonfly*)
+        ccdef="-DZ_ELF -DZ_DOT_LABEL_PREFIX $ccdef"
+        arch='x86_64'
+	;;
     i386-*darwin* | x86_64-*darwin*)
         ccdef="-DZ_UNDERSCORE_PREFIX -DZ_MACOS $ccdef"
         if test "x$wordsize" = "x64"; then
