+[NOTE]
+ifdef::env-github[]
+.**Thanks for the code!**
+endif::[]
+ifndef::env-github[]
+.Thanks for the code!
+endif::[]
+====
+We'd like to thank the authors of the following projects which are
+embedded into the {bt2} source tree:
+
+* https://github.com/fmtlib/fmt[\{fmt}]
+* https://github.com/nlohmann/json[JSON for Modern {cpp}]
+* https://github.com/martinmoene/optional-lite[optional lite]
+* https://github.com/martinmoene/span-lite[span lite]
+* https://github.com/martinmoene/string-view-lite[string_view lite]
+* https://github.com/wonder-mice/zf_log[zf_log]
+====