I try to install the dependencies required for the latest develop branch on a windows machine by using conan. The file conanfile.txt requires the installation of the package b2/4.10.1, for which a given toolset is specified: `b2/4.10.1:toolset=gcc` For some reasons, the installation of the package b2/5.2.1 is also required during installation, even if it is not specified in conanfile.txt. As no toolset is specified for the version 5.2.1, it automatically looks for a Microsoftt visual studio compiler (not gcc), and aborts the installation, since it is not installed on my machine. Trying to specify a a toolset for b2/5.2.1 in conanfile.txt (`b2/5.2.1:toolset=gcc`) or for both versions (`b2/*:toolset=gcc`) did not solve the issue.