Fix compilation with Boost 1.76

We were previously relying on an indirect include within Boost headers. We're
using scoped_ptr which is defined in <boost/smart_ptr/scoped_ptr.hpp>.

Bug: https://bugs.gentoo.org/790176
Closes: https://github.com/ledger/ledger/issues/2030

1 files changed, 2 insertions, 0 deletions

diff --git a/src/format.h b/src/format.h
index 15431cf1..48c690be 100644
--- a/src/format.h
+++ b/src/format.h
@@ -45,6 +45,8 @@
 #include "expr.h"
 #include "unistring.h"
 
+#include <boost/smart_ptr/scoped_ptr.hpp>
+
 namespace ledger {
 
 class unistring;