$NetBSD: patch-configure,v 1.4 2015/09/02 12:39:33 fhajny Exp $

Look for history/readline at proper places.
--- configure.orig	2015-08-16 02:25:15.000000000 +0000
+++ configure
@@ -17662,7 +17662,7 @@ fi
 $as_echo_n "checking for history... " >&6; }
 
 
-SEARCHPATH=/usr
+SEARCHPATH=${prefix}
 NAME=history
 HEADER=readline/history.h
 LIBNAME=history
@@ -17998,7 +17998,7 @@ fi
 $as_echo_n "checking for readline... " >&6; }
 
 
-SEARCHPATH=/usr
+SEARCHPATH=${prefix}
 NAME=readline
 HEADER=readline/readline.h
 LIBNAME=readline
@@ -18606,7 +18606,7 @@ rm -f core conftest.err conftest.$ac_obj
 
 
 
-SEARCHPATH=/usr
+SEARCHPATH=${prefix}
 NAME=iconv
 HEADER=iconv.h
 LIBNAME=iconv
@@ -33144,7 +33144,7 @@ print CONFIG["arch"]
 print "\n"
 print "ruby_version = "
 begin
-print Config::CONFIG["ruby_version"]
+print RbConfig::CONFIG["ruby_version"]
 rescue
 print CONFIG["ruby_version"]
 end