[CMake] Running configure/make from CMakeLists.txt

[Sean Soria]

I'm trying to convert a project to cmake.  There are a lot of other
open source libraries contained in the project which are compiled
using configure/make.  I'd like to not have to convert their build
methods to use cmake as well.  Is there a simple way to run
configure/make on a directory from cmake?  I don't imagine I can put
CMakeLists.txt into the directory because it will create a Makefile,
which running ./configure would also do.