Compiling in Linux 64 bits

[DavidPerezIngeniero]

I have installed CMake 2.8.12;2
And I do:

$ mkdir build
$ cd build
$ cmake ..
-- The C compiler identification is GNU 7.3.1
-- The CXX compiler identification is GNU 7.3.1
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
CMake Error at CMakeLists.txt:6 (add_subdirectory):
  The source directory

    /home/jenkins/webp-imageio-0.1.6/libwebp

  does not contain a CMakeLists.txt file.


-- Found JNI: /usr/lib/jvm/java/lib/libjawt.so  
-- Configuring incomplete, errors occurred!
See also "/home/jenkins/webp-imageio-0.1.6/build/CMakeFiles/CMakeOutput.log".

Why do I get this error?
I've followed the instructions.