how to configure my output build in tfs 2012 -

i have solution installer wrote in wix.

i integrated wix msbuild written in this post. in order preform heat on /bin directory need /bin path. use output variable , worked, when tried build solution on tfs 2012 update 1 build server found out the /bin in different location.

i looking variable fits both local build , 1 on build machine.

i added new variable wxs thus: , picked libs obj folder (which works). use intermediateoutputpath instead?