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-rw-r--r--xsd/cxx/elements.cxx1
1 files changed, 1 insertions, 0 deletions
diff --git a/xsd/cxx/elements.cxx b/xsd/cxx/elements.cxx
index a62ed5d..2bd29bb 100644
--- a/xsd/cxx/elements.cxx
+++ b/xsd/cxx/elements.cxx
@@ -7,6 +7,7 @@
#include <backend-elements/regex.hxx>
+#include <cctype> // std::toupper
#include <sstream>
#include <iostream>
#include <algorithm>