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-rw-r--r--build/cxx/rule.cxx1
1 files changed, 1 insertions, 0 deletions
diff --git a/build/cxx/rule.cxx b/build/cxx/rule.cxx
index f05370d..095c98a 100644
--- a/build/cxx/rule.cxx
+++ b/build/cxx/rule.cxx
@@ -12,6 +12,7 @@
#include <butl/process>
#include <butl/fdstream>
+#include <butl/optional>
#include <build/scope>
#include <build/variable>