[Minor] Add missing cmath include

diff --git a/src/libserver/html/html_tag.hxx b/src/libserver/html/html_tag.hxx
index 4e4de3aa477bc0a79e21b438129c74a4528bf2fc..b201121d72109085a728ad904eb07c4b7012a99f 100644 (file)
--- a/src/libserver/html/html_tag.hxx
+++ b/src/libserver/html/html_tag.hxx
@@ -24,6 +24,7 @@
 #include <vector>
 #include <optional>
 #include <cstdint>
+#include <cmath>
 
 #include "html_tags.h"
 #include "libutil/str_util.h"