dnsdist: Fix missing variant header that prevents building on EL8

diff --git a/pdns/dnsdistdist/dnsdist-configuration-yaml.cc b/pdns/dnsdistdist/dnsdist-configuration-yaml.cc
index 3719c2dfa93299b5b895bdffb15eac1d1e800c01..2407b35a26b923772f123c68e344630b09478a6b 100644 (file)
--- a/pdns/dnsdistdist/dnsdist-configuration-yaml.cc
+++ b/pdns/dnsdistdist/dnsdist-configuration-yaml.cc
@@ -49,6 +49,8 @@
 #include "dnsdist-configuration-yaml-internal.hh"
 
 #include <boost/uuid/string_generator.hpp>
+#include <variant>
+
 #endif /* HAVE_YAML_CONFIGURATION */
 
 namespace dnsdist::configuration::yaml