DPL: add missing header on macOS (#13867)

ktf · web-flow · commit fcb75a1cb86d · 2025-01-16T10:30:19.000+01:00
For some reasons this is not included anymore.
diff --git a/Framework/Core/src/DataSpecUtils.cxx b/Framework/Core/src/DataSpecUtils.cxx
@@ -16,6 +16,7 @@
 #include "Headers/DataHeaderHelpers.h"
 
 #include <fmt/format.h>
+#include <sstream>
 #include <cstring>
 #include <cinttypes>
 #include <regex>
