Add PNG connection type and Freetype 2 font rendering to glcd driver. The PNG

image writer is for debugging only. The Freetype font renderer still misses
some features (e.g. big numbers, character encoding, non-standard cell size).

configure.in

@@ -254,7 +254,7 @@ AC_MSG_CHECKING([if libusb support has been enabled]);
 AC_ARG_ENABLE(libusb,
 	[AS_HELP_STRING([--disable-libusb],[disable USB support using libusb])],
 	[ if test "$enableval" != "no"; then
-		enable_libusb="yes"
+		enable_libusb=yes
 	fi ],
 	[ enable_libusb=yes ]
 )
@@ -316,6 +316,30 @@ fi
 AC_SUBST(LIBHID_LIBS)
 AC_SUBST(LIBHID_CFLAGS)
 
+# PNG library
+LCD_PNG_LIB
+
+dnl ######################################################################
+dnl freetype support
+dnl ######################################################################
+AC_MSG_CHECKING([if freetype support has been enabled]);
+AC_ARG_ENABLE(freetype,
+	[AS_HELP_STRING([--disable-freetype],[disable freetype support])],
+	[ if test "$enableval" != "no"; then
+		enable_freetype=yes
+	fi ],
+	[ enable_freetype=yes ]
+)
+AC_MSG_RESULT($enable_freetype)
+
+if test "$enable_freetype" = "yes"; then
+	ifdef([AC_CHECK_FT2],
+		[AC_CHECK_FT2([],
+			[AC_DEFINE(HAVE_FT2, [1], [Define to 1 if you have freetype])],
+			[enable_freetype=no])],
+		[AC_MSG_WARN([freetype does not seem to be installed])])
+fi
+
 dnl ######################################################################
 dnl ethlcd support
 dnl ######################################################################