ld-flags on win

Hi all, I'm on my win64 build and I'm using asdf to define my system but with asdf:make-build or asdf:load-bundle-op the ld-flags option to link some additional static library to my fasl is not passed to the linker. So far I workaround with (si:setenv "_CL_" "bla bla bla") but it's not ideal. Am I doing something wrong or is a know issue? Kindest regards. bix P.S. ECL is so fun. Great job.