change build.sh to ensure gnu make

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@569 d0543943-73ff-0310-b7d9-9358b9ac24b2

build.sh

@@ -1 +1,32 @@
-make depends && make install modules install_mod 
+#!/bin/sh
+
+make=`which gmake 2>/dev/null || which make 2>/dev/null || make`
+check=`($make --version 2>/dev/null | grep GNU) || echo bad`
+
+if [ "$check" = "bad" ] ; then
+    echo "Sorry, you need GNU make to build this application"
+    exit 1
+fi
+
+if [ -z $1 ] ; then
+    echo "Usage: $0 <build | configure> [--prefix=/prefix/dir>]"
+    echo
+    echo "The 'build' option will fully install the application to the given --prefix"
+    echo "The 'configure' option will reconfigure and exit."
+    echo
+    echo "The default --prefix is /usr/local/freeswitch"
+    exit 1
+fi
+
+if [ $1 = "configure" ] ; then
+    shift
+    ./configure $@
+    exit 0
+fi
+
+if [ ! -f ./Makefile ] ; then
+    ./configure $@
+fi
+
+$make installall
+