You can pass to umake a list of files and directory. Files can be sources, headers and libraries. Directory will be searched and all the sources and libraries they contain will be included in the build.

$ ls -R .

.:
uobj1  uobj2

./uobj1:
myuobj1.cc

./uobj2:
myuobj2.cc

$ umake uobj1 uobj2

/usr/local/gostai/core/linux/libtool --tag=CXX --mode=compile g++ -O2
 -pthread -I/usr/local/gostai/core/include -c uobj1/myuobj1.cc -o uobj1/1.lo
 g++ -O2 -pthread -I/usr/local/gostai/core/include -c uobj1/myuobj1.cc -o
 uobj1/1.o /usr/local/gostai/core/linux/libtool --tag=CXX
 --mode=compile g++ -O2 -pthread -I/usr/local/gostai/core/include -c
 uobj2/myuobj2.cc -o uobj2/2.lo g++ -O2 -pthread
 -I/usr/local/gostai/core/include -c uobj2/myuobj2.cc -o uobj2/2.o
 /usr/local/gostai/core/linux/libtool --mode=link --tag=CXX g++ -O2
 -pthread -L/usr/local/gostai/core/linux/remote -o
 urbiengine-linux-remote uobj1/1.o uobj2/2.o
 /usr/local/gostai/core/linux/remote/*.la mkdir .libs libtool: link:
 warning: library
 `/usr/local/gostai/core/linux/remote/libkernel-remote.la' was moved.
 libtool: link: warning: library
 `/usr/local/gostai/core/linux/remote/libkernel-remote.la' was moved.
 g++ -O2 -pthread -o urbiengine-linux-remote uobj1/1.o uobj2/2.o
 -L/usr/local/gostai/core/linux/remote
 /usr/local/gostai/core/linux/remote/libkernel-remote.a
 -L/tmp/urbi/gostai/core/linux/remote

$ ls -R .

.: uobj1 uobj2  urbiengine-linux-remote

./uobj1:
myuobj1.cc

./uobj2:
myuobj2.cc