function print_message
{
	echo "   " $@
}

function print_topic
{
	echo -n "(II) " $@
}

function print_ack
{
	echo "...ok"
}

function print_nack
{
	echo "...failed"
}

function print_error
{
	echo "(EE) " $@
}

function print_warning
{
	echo "(WW) " $@
}

function print_info
{
	if [ $VERBOSE == "yes" ]; then
		echo "         " $@
	fi
}

function print_exit
{
	echo " => fatal error occured - see (WW) and (EE) tags for more info"
	echo " => for support send a bugreport with this output to"
	echo "            $SUPPORT_ADDRESS"
	echo " => exiting gracefuly..."
}

function print_separator
{
	echo "--------------------------------------------------------------"
}

function print_small_separator
{
	echo "      ---"
}

function print_newline
{
	echo ""
}


#### Command Line Options

function check_command_line_options
{
	local arg
	for arg in $@; do
		case $arg in
			--enable-glut )
				ENABLE_GLUT="yes"
				;;
			--disable-glut )
				ENABLE_GLUT="no"
				;;
			--enable-gtk )
				ENABLE_GTK="yes"
				;;
			--disable-gtk )
				ENABLE_GTL="no"
				;;
			-v )
				VERBOSE="yes"
				;;
			--verbose )
				VERBOSE="yes"
				;;
			*)
				print_command_line_options
				exit 1
				;;
		esac
	done
}

function print_command_line_options
{
	echo ""
	echo "USAGE:"
	echo "--enable-<option>     enable option"
	echo "--disable-<option>    disable option"
	echo "-v  --verbose         verbose output"
	echo ""
	echo "OPTIONS:"
	echo "glut                  enable use of glut library (default: $ENABLE_GLUT)"
	echo "gtk                   enable use of gtk libraty (default: $ENABLE_GTK)"
	echo ""
	echo "EXAMPLE:"
	echo "./configure --enable-gtk"
	echo ""
}


#### Check OS
function get_OS
{
	#if [ uname -a | awk '{print $1}' ==  "Linux" ]; then
	#	return 0
	#fi
	#return 1
	#name -a | awk '{if( $1 == "Linux" ) print "1"; else print "0"}'
	echo "not supported function"
}


#### Check GLUT 
function check_for_GLUT
{
	local directory
	for directory in $std_include_dirs; do
		if [ -f $directory/glut.h ]; then
			GLUT_DIR=$directory/glut.h
			return 0
		fi
	done
	return 1
}


### Check for Direct Rendering Support
function check_for_glxinfo
{
	local directory
	for directory in $std_bin_dirs; do
		if [ -f $directory/glxinfo ]; then
			return 0
		fi
	done
	return 1
}

function check_for_dri
{
	DRI_SUPPORT=`glxinfo | grep "direct rendering:" | awk '{print $3}'`
	if [ $DRI_SUPPORT == "No" ]; then
		return 1
	fi
	return 0
}

### GtK Check
function check_for_gtk_config
{
	local directory
	for directory in $std_bin_dirs; do
		if [ -f $directory/gtk-config ]; then
			GTK_CONFIG=$directory/gtk-config
			return 0
		fi
	done
	return 1
}