Attempt to fix #8137 (arrived at r40862).

[lyx.git] / src / support / weighted_btree.h

diff --git a/src/support/weighted_btree.h b/src/support/weighted_btree.h
index babb2258ce8d355c59f58120996ea6eec39d5f02..b64f95366f6e5cb2f398560b0ffe7156eaf0237c 100644 (file)
--- a/src/support/weighted_btree.h
+++ b/src/support/weighted_btree.h
@@ -29,6 +29,7 @@
 // *** Required Headers from the STL
 
 #include <algorithm>
+#include <cstddef>
 #include <functional>
 #include <istream>
 #include <ostream>