[ft] FT_Get_Advance() for advance-width callbacks
Using graphite2's comparerenderer suggests that this makes hb-ft 15
times faster. No caching layer needed anymore.
diff --git a/configure.ac b/configure.ac
index 6cd1018..f42fb3c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -134,7 +134,7 @@
dnl ==========================================================================
-PKG_CHECK_MODULES(FREETYPE, freetype2, have_freetype=true, have_freetype=false)
+PKG_CHECK_MODULES(FREETYPE, freetype2 >= 2.3.8, have_freetype=true, have_freetype=false)
if $have_freetype; then
AC_DEFINE(HAVE_FREETYPE, 1, [Have FreeType 2 library])
_save_libs="$LIBS"
