--- libs/cobalt/build/Jamfile.orig	2026-04-15 14:38:53 UTC
+++ libs/cobalt/build/Jamfile
@@ -21,6 +21,7 @@ project : requirements
 
 project : requirements
   <define>BOOST_ASIO_NO_DEPRECATED
+  <toolset>gcc:<cxxflags>"-std=c++20 -fcoroutines"
   <toolset>msvc:<define>_SCL_SECURE_NO_WARNINGS
   <toolset>msvc:<define>_CRT_SECURE_NO_DEPRECATE
   <toolset>msvc:<cxxflags>/bigobj