Error with cmakefiles.txt

[Gusions]

I'm tryng to compile the last commit of ergo and i have this erro:

gusions@gusions-netbook:~/sorgentielementary/ergo/build$ cmake ..
CMake Error at CMakeLists.txt:15 (add_subdirectory):
  add_subdirectory given source "lib" which is not an existing directory.

-- checking for a minimum Vala version of 0.10.0
-- found Vala, version 0.13.1.74-93b0
-- GSettings schemas will be installed into /usr/share/glib-2.0/schemas/
-- Configuring incomplete, errors occurred!
gusions@gusions-netbook:~/sorgentielementary/ergo/build$ sudo make
make: *** Nessun obiettivo specificato e nessun makefile trovato. Arresto.
gusions@gusions-netbook:~/sorgentielementary/ergo/build$ sudo cmake ..
CMake Error at CMakeLists.txt:15 (add_subdirectory):
  add_subdirectory given source "lib" which is not an existing directory.

-- checking for a minimum Vala version of 0.10.0
-- found Vala, version 0.13.1.74-93b0
-- GSettings schemas will be installed into /usr/share/glib-2.0/schemas/
-- Configuring incomplete, errors occurred!