Index: Jamroot
--- Jamroot.orig
+++ Jamroot
@@ -146,11 +146,12 @@ import tools/boost\_install/boost-install ;
 path-constant BOOST_ROOT : . ;
 constant BOOST_VERSION : 1.80.0 ;
 constant BOOST_JAMROOT_MODULE : $(__name__) ;
+constant SO_VERSION : ${SO_VERSION} ;
 
 # Allow subprojects to simply `import config : requires ;` to get access to the requires rule
 modules.poke : BOOST_BUILD_PATH : $(BOOST_ROOT)/libs/config/checks [ modules.peek : BOOST_BUILD_PATH ] ;
 
-boostcpp.set-version $(BOOST_VERSION) ;
+boostcpp.set-version $(SO_VERSION) ;
 
 use-project /boost/architecture : libs/config/checks/architecture ;