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-rw-r--r--libbrep/types.hxx2
1 files changed, 2 insertions, 0 deletions
diff --git a/libbrep/types.hxx b/libbrep/types.hxx
index b4a3b19..ef37da4 100644
--- a/libbrep/types.hxx
+++ b/libbrep/types.hxx
@@ -65,6 +65,8 @@ namespace brep
using std::system_error;
using io_error = std::ios_base::failure;
+ using std::generic_category;
+
// <libbutl/optional.mxx>
//
using butl::optional;