[configure] Fix check for FreeType

configure.ac

diff --git a/configure.ac b/configure.ac
index ea4452c..59b0ca8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -27,7 +27,7 @@
 fi
 AM_CONDITIONAL(HAVE_GLIB, $have_glib)
 
-PKG_CHECK_MODULES(FREETYPE, freetype, have_freetype=true, have_freetype=false)
+PKG_CHECK_MODULES(FREETYPE, freetype2, have_freetype=true, have_freetype=false)
 if $have_freetype; then
 	AC_DEFINE(HAVE_FREETYPE, 1, [Have FreeType 2 library])
 fi