Include ft2build.h before freetype/freetype.h. Libfreetype 2.1.7
requires this.

diff --git a/configure.ac b/configure.ac
index 26032be..bf00ea6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -447,7 +447,8 @@
 	FREETYPEINCL=`$ft_devel --cflags`
 	ac_save_CPPFLAGS="$CPPFLAGS"
 	CPPFLAGS="$FREETYPEINCL $CPPFLAGS"
-	AC_CHECK_HEADERS(freetype/freetype.h \
+	AC_CHECK_HEADERS(ft2build.h \
+                         freetype/freetype.h \
                          freetype/ftglyph.h \
                          freetype/tttables.h \
                          freetype/ftnames.h \