Fix compile with older FreeType
diff --git a/configure.ac b/configure.ac
index 12045cf..f9ca23b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -38,6 +38,13 @@
PKG_CHECK_MODULES(FREETYPE, freetype2, have_freetype=true, have_freetype=false)
if $have_freetype; then
AC_DEFINE(HAVE_FREETYPE, 1, [Have FreeType 2 library])
+ _save_libs="$LIBS"
+ _save_cflags="$CFLAGS"
+ LIBS="$LIBS $FREETYPE_LIBS"
+ CFLAGS="$CFLAGS $FREETYPE_CFLAGS"
+ AC_CHECK_FUNCS(FT_Face_GetCharVariantIndex)
+ LIBS="$_save_libs"
+ CFLAGS="$_save_cflags"
fi
AM_CONDITIONAL(HAVE_FREETYPE, $have_freetype)