Index: src/rs-curve.c
--- src/rs-curve.c.orig
+++ src/rs-curve.c
@@ -20,6 +20,7 @@
 
 #include <math.h>
 #include <libxml/encoding.h>
+#include <libxml/parser.h>
 #include <libxml/xmlwriter.h>
 #include <string.h> /* memset() */
 #include "color.h"
