From 3ca248eb8f6ebeca4ab0c5fdc67c768769a058ed Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 4 Oct 2022 07:41:52 +0200
Subject: Work around lack of C++17 ctor in butl::optional

---
 bbot/agent/machine.cxx | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/bbot/agent/machine.cxx b/bbot/agent/machine.cxx
index 911d65b..443ab28 100644
--- a/bbot/agent/machine.cxx
+++ b/bbot/agent/machine.cxx
@@ -309,11 +309,21 @@ namespace bbot
     }
     else
     {
+      // @@ TMP: libstud-optional issue #1.
+      //
+#if 0
       auto add = [&os] (string o, optional<string> v = {})
       {
         os.push_back (move (o));
         if (v) os.push_back (move (*v));
       };
+#else
+      auto add = [&os] (string o, string v = {})
+      {
+        os.push_back (move (o));
+        if (!v.empty ()) os.push_back (move (v));
+      };
+#endif
 
       // Network.
       //
-- 
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