QBS Thirdparty

[Babalas]

In cmake you can use ExternalProject_Add to extract and build third party libraries. A simple example for building curl looks like:
@ExternalProject_Add(curl
URL ${curl_file}
URL_MD5 ${curl_md5}
BUILD_IN_SOURCE 1
CONFIGURE_COMMAND <SOURCE_DIR>/configure --prefix=<INSTALL_DIR>
)@

I'd like to do something similar with qbs but this is my "learn qbs" project. How would I do something like this?