Error:

[5/8] Performing configure step for 'Eigen'

...

• ************
• * Eigen's unit tests configuration summary *
• ************
• Build type: Debug
• Build site: ghosts
• Build string: linux-4.4.0-22-generic-_-5.3.1-sse2-64bit
• Enabled backends:
• Disabled backends: Cholmod, UmfPack, SuperLU, PaStiX, METIS, Qt4 support, GoogleHash, Adolc, MPFR C++, fftw, OpenGL,
• Default order: Column-major
• Maximal matrix/vector size: 320
• SSE2: Using architecture defaults
• SSE3: Using architecture defaults
• SSSE3: Using architecture defaults
• SSE4.1: Using architecture defaults
• SSE4.2: Using architecture defaults
• Altivec: Using architecture defaults
• ARM NEON: Using architecture defaults

CXX: /usr/lib/ccache/c++
CXX_VERSION: c++ (Ubuntu 5.3.1-14ubuntu2.1) 5.3.1 20160413
CXX_FLAGS: -std=c++11 -fexceptions -pedantic -Wall -Wextra -Wundef -Wcast-align -Wchar-subscripts -Wnon-virtual-dtor -Wunused-local-typedefs -Wpointer-arith -Wwrite-strings -Wformat-security -Wno-psabi -Wno-variadic-macros -Wno-long-long -fno-check-new -fno-common -fstrict-aliasing -ansi -g2
Sparse lib flags:

• ************
• Configured Eigen 3.2.8
• To build/run the unit tests, read this page:
• http://eigen.tuxfamily.org/index.php?title=Tests
• Configuring done

CMake Error:

The detected version of Ninja () is less than the version of Ninja required
by CMake (1.3).

CMake Warning:

Manually-specified variables were not used by the project:

  CMAKE_C_FLAGS_RELEASE
  CMAKE_C_FLAGS_RELWITHDEBINFO
  CMAKE_MODULE_LINKER_FLAGS
  CMAKE_SHARED_LINKER_FLAGS