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-rw-r--r--build2/diagnostics1
1 files changed, 1 insertions, 0 deletions
diff --git a/build2/diagnostics b/build2/diagnostics
index b889fd4..2c2b4bb 100644
--- a/build2/diagnostics
+++ b/build2/diagnostics
@@ -110,6 +110,7 @@ namespace build2
// Diagnostic facility, base infrastructure.
//
+ using butl::diag_lock;
using butl::diag_stream;
using butl::diag_epilogue;