The BaseTools directory is currently being located as a sub-directory of the WORKSPACE env var. This might not be true in other environments. Cf EDKII Build Specification, s4.1.3 "Build Process Restrictions": There is no restriction on the location of the EDK_TOOLS_PATH, it may be located within a directory identified as the WORKSPACE directory, or in any other location that is accessible on the development workstation. Locate the BaseTools directory using EDK_TOOLS_PATH instead. Cc: Sean Brogan <sean.brogan@microsoft.com> Cc: Bret Barkelew <Bret.Barkelew@microsoft.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Liming Gao <gaoliming@byosoft.com.cn> Cc: Sami Mujawar <sami.mujawar@arm.com> Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com> Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>