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-rw-r--r--libbpkg/manifest.cxx3
1 files changed, 3 insertions, 0 deletions
diff --git a/libbpkg/manifest.cxx b/libbpkg/manifest.cxx
index ee71596..b7f744f 100644
--- a/libbpkg/manifest.cxx
+++ b/libbpkg/manifest.cxx
@@ -33,6 +33,9 @@ namespace bpkg
using serialization = manifest_serialization;
using name_value = manifest_name_value;
+ using butl::optional;
+ using butl::nullopt;
+
// Utility functions
//
static const strings priority_names ({"low", "medium", "high", "security"});