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-rw-r--r--src/XPM.cxx1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/XPM.cxx b/src/XPM.cxx
index a789a47d4..cfe6d94af 100644
--- a/src/XPM.cxx
+++ b/src/XPM.cxx
@@ -12,6 +12,7 @@
#include <string_view>
#include <vector>
#include <map>
+#include <optional>
#include <algorithm>
#include <iterator>
#include <memory>