$NetBSD: patch-configure,v 1.1 2017/02/24 22:07:34 adam Exp $

Add DragonFly support.
Detect presence of alloca.h.

--- configure.orig	2016-05-31 01:56:39.000000000 +0000
+++ configure
@@ -2409,6 +2409,7 @@ case $host_os in
   darwin*) template=darwin ;;
     dgux*) template=dgux ;;
  freebsd*) template=freebsd ;;
+ dragonfly*) template=dragonfly ;;
     hpux*) template=hpux ;;
     irix*) template=irix ;;
    linux*|gnu*|k*bsd*-gnu)
@@ -4311,7 +4312,7 @@ fi
 
 # On IRIX 5.3, sys/types and inttypes.h are conflicting.
 for ac_header in sys/types.h sys/stat.h stdlib.h string.h memory.h strings.h \
-		  inttypes.h stdint.h unistd.h
+		  inttypes.h stdint.h unistd.h alloca.h
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
 ac_fn_c_check_header_compile "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default