--- ./configure.orig	2010-04-04 17:02:40.000000000 +0800
+++ ./configure	2012-09-28 22:42:14.000000000 +0800
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 PID=$$
 
 # NLS nuisances.
@@ -19,15 +19,15 @@
 #########################
 ## Help                ##
 #########################
-function check_help ()
+check_help ()
 {
-    [ "$1" == "--help" ] && usage 0
+    [ "$1" = "--help" ] && usage 0
     return 1
 }
 
 
 
-function usage ()
+usage ()
 {
     echo "\`configure\' configures this package to adapt to many kinds of systems."
     echo "Usage: ./configure [variables] [features]"
@@ -55,17 +55,17 @@
     exit $1
 }
 
-function error ()
+error ()
 {
     echo "error: $@"
     exit 1
 }
 
-function check_name ()
+check_name ()
 {
     local s=""
     for i in `eval echo \\$$2`; do
-        [ "$1" == "$i" ] && s=1 && break
+        [ "$1" = "$i" ] && s=1 && break
     done
     [ -z "$s" ] && return 0
     error "Cam't add '$1' to $2: such name already exists."
@@ -80,7 +80,7 @@
 # $1 - variable's name, shoud survive 'declare $1'
 # $2 - help string, description
 # $3 - default value, any bash code suitable for 'eval var=$default'
-function add_var ()
+add_var ()
 {
     check_name "$1" vars
     vars="$vars $1" # to know var creation order, it's important
@@ -88,23 +88,23 @@
     eval hlp_$1="\"$2\""
 }
 
-function check_var ()
+check_var ()
 {
     local var val A
 
-    [ "$(sed -e 's/--[^=]\+=[^=]*/AA/' <<< $1)" != AA ] && return 1
+    [ "$(echo $1 | sed -E 's/--[^=]+=[^=]*/AA/')" != AA ] && return 1
 
-    A=${1:2}
+    A=${1#--}
     var=${A%%=*}
-    var=$(tr "[:upper:]-" "[:lower:]_"  <<< $var)
+    var=$(echo $var | tr "[:upper:]-" "[:lower:]_")
     val=${A#*=}
-    [ "$vars" == "${vars/$var/}" ] && error "$var - unknown variable"
+    echo "$vars" | grep -qw "$var" || error "$var - unknown variable"
     eval $var="\"${val}\""
 
     return 0
 }
 
-function update_vars ()
+update_vars ()
 {
     local val
     for i in $vars; do
@@ -118,7 +118,7 @@
     done
 }
 
-function display_vars ()
+display_vars ()
 {
     local i
     for i in $vars; do
@@ -126,25 +126,25 @@
     done
 }
 
-function dump_vars_h ()
+dump_vars_h ()
 {
     local i
     if true; then
         for i in $vars; do
             eval val=\$$i
-            echo "#define  $(tr "[:lower:]-" "[:upper:]_"  <<< $i)  \"${val}\""
+            echo "#define $(echo $i | tr "[:lower:]-" "[:upper:]_") \"${val}\""
         done
     fi
 
 }
 
-function dump_vars_mk ()
+dump_vars_mk ()
 {
     local i
     if true; then
         for i in $vars; do
             eval val=\$$i
-            echo "$(tr "[:lower:]-" "[:upper:]_"  <<< $i) = $val"
+            echo "$(echo $i | tr "[:lower:]-" "[:upper:]_") = $val"
         done
     fi
 
@@ -157,7 +157,7 @@
 # $1 - feature's name, shoud survive 'declare $1'
 # $2 - help string, description
 # $3 - "enabled" or "disabled" string
-function add_feature ()
+add_feature ()
 {
     check_name "$1" features
     features="$features $1"
@@ -165,21 +165,21 @@
     eval $1="'$3'"
 }
 
-function check_feature ()
+check_feature ()
 {
-    [ "$(sed  -e 's/--\(enable\|disable\)-.\+/AA/' <<< $1)" != AA ] && return 1
-    A=${1:2}
+    [ "$(echo $1 | sed -E 's/--(enable|disable)-.+/AA/')" != AA ] && return 1
+    A=${1#--}
     var=${A#*-}
     val=${A%%-*}
     #echo "feat=$feat status=$status"
     [ "$val" != "enable" ] && [ "$val" != "disable" ] && return 1
-    [ "$features" == "${features/$var/}" ] && error "$var - unknown feature"
+    [ "$features" = "${features/$var/}" ] && error "$var - unknown feature"
     eval $var="$val"d
 
     return 0
 }
 
-function display_features ()
+display_features ()
 {
     local i
     for i in $features; do
@@ -187,13 +187,13 @@
     done
 }
 
-function update_features ()
+update_features ()
 {
     local val
     for i in $features; do
         eval val="\$$i"
         if eval $i="\"$val\"" 2>/dev/null ; then
-            eval [ "\$$i" == "enabled" -o "\$$i" == "disabled" ] && continue
+            eval [ "\$$i" = "enabled" -o "\$$i" = "disabled" ] && continue
         fi
         echo "Default value of '$i' couldn't be set from '$val'"
         echo "Set it explicitly with '--$i=value'"
@@ -202,25 +202,25 @@
     done
 }
 
-function dump_features_h ()
+dump_features_h ()
 {
     local i
     if true; then
         for i in $features; do
             str='#undef'
-            eval [ "\$$i" == "enabled" ] && str='#define'
-            echo "$str $(tr "[:lower:]-" "[:upper:]_"  <<< $i)"
+            eval [ "\$$i" = "enabled" ] && str='#define'
+            echo "$str $(echo $i | tr "[:lower:]-" "[:upper:]_")"
         done
     fi
 }
 
-function dump_features_mk ()
+dump_features_mk ()
 {
     local i
     if true; then
         for i in $features; do
-            eval [ "\$$i" == "enabled" ] && str='#define'
-            eval echo "$(tr "[:lower:]-" "[:upper:]_"  <<< $i):=\$$i"
+            eval [ "\$$i" = "enabled" ] && str='#define'
+            eval echo "$(echo $i | tr "[:lower:]-" "[:upper:]_"):=\$$i"
         done
     fi
 }
@@ -231,7 +231,7 @@
 ## Engine              ##
 #########################
 
-function parse_args ()
+parse_args ()
 {
     # parse command line variables
     while [ $# -gt 0 ]; do
@@ -246,15 +246,15 @@
 
 
 
-function bslash ()
+bslash ()
 {
     p1="%%$1%%"
     t=`eval echo \\${$1}`
-    p2=`sed -e 's/\//\\\\\//g' <<< $t`
+    p2=`echo $t | sed -e 's/\//\\\\\//g'`
     echo "s/$p1/$p2/g"
 }
 
-function substitute ()
+substitute ()
 {
 
     if true; then
@@ -271,7 +271,7 @@
     done
 }
 
-function dump_config_h ()
+dump_config_h ()
 {
     echo "Creating config.h"
     if true; then
@@ -287,7 +287,7 @@
     fi > config.h
 }
 
-function dump_config_mk ()
+dump_config_mk ()
 {
     echo "Creating config.mk"
     if true; then
@@ -301,7 +301,7 @@
     fi > config.mk
 }
 
-function main ()
+main ()
 {
     parse_args "$@"
     update_vars
@@ -343,7 +343,7 @@
 #########################
 ## User settings here  ##
 #########################
-source scripts/custom.sh
+. scripts/custom.sh
 
 #########################
 ## Run It All          ##