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-rw-r--r--src/option.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/option.h b/src/option.h
index 35b1c893..274d0a95 100644
--- a/src/option.h
+++ b/src/option.h
@@ -47,6 +47,8 @@
namespace ledger {
+using namespace boost::placeholders;
+
class call_scope_t;
template <typename T>