Submitted upstream at https://bugs.netsurf-browser.org/mantis/view.php?id=2870

--- libcss-0.9.2/test/dump.h.orig
+++ libcss-0.9.2/test/dump.h
@@ -131,7 +131,7 @@ void dump_rule_media(css_rule_media *s, char **buf, size_t *buflen)
 	char *ptr = *buf;
 	css_rule *rule;
 
-	ptr += sprintf(ptr, "| @media %s%03lx",
+	ptr += sprintf(ptr, "| @media %s%03" PRIx64,
 			s->media->negate_type ? "not " : "",
 			s->media->type);
 
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<tr><td><span title='2024-04-14 10:29:07 +0200'>2024-04-14</span></td><td><a href='/guix/commit/doc/images?id=076670f7acb740e2bfbd8e3c8ef1be5221ed75c5'>doc: Use "dejavu sans" instead of "Helvetica" or "sans" in dot images.</a><span class='msg-avail'>...</span></td><td>Janneke Nieuwenhuizen</td></tr>