shogun BUILD_META_EXAMPLES=ON

~/shogun/build$ cmake BUILD_META_EXAMPLES=ON ..
-- dir='/home/saphire/shogun/src'
-- dir='/home/saphire/shogun/build/src'
-- dir='/home/saphire/shogun/src/gpl'
-- Using system's malloc
-- Could NOT find rxcpp (missing: rxcpp_INCLUDE_DIR)
-- Could NOT find TFLogger (missing: TFLogger_DIR)
-- A library with BLAS API found.
-- Enabling detected BLAS library as backend for Eigen
-- Could NOT find GLPK (missing: GLPK_LIBRARY GLPK_INCLUDE_DIR GLPK_PROPER_VERSION_FOUND)
-- Could NOT find CPLEX (missing: CPLEX_LIBRARY CPLEX_INCLUDE_DIR)
-- Could NOT find MOSEK (missing: MOSEK_DIR MOSEK_INCLUDE_DIR MOSEK_LIBRARY MOSEK_LIBRARIES)
-- Could NOT find Protobuf (missing: Protobuf_INCLUDE_DIR)
-- Could NOT find JSON (missing: JSON_INCLUDE_DIR JSON_LIBRARY) (Required is at least version "0.11")
-- HDF5: Using hdf5 compiler wrapper to determine C configuration
-- Could NOT find CURL (missing: CURL_LIBRARY CURL_INCLUDE_DIR)
-- Could NOT find SNAPPY (missing: SNAPPY_LIBRARIES SNAPPY_INCLUDE_DIR)
-- Lzo includes and libraries NOT found.
-- Could NOT find NLOPT (missing: NLOPT_LIBRARY NLOPT_INCLUDE_DIR)
-- Could NOT find LPSOLVE (missing: LPSOLVE_LIBRARIES LPSOLVE_INCLUDE_DIR)
-- Could NOT find ColPack (missing: COLPACK_LIBRARIES COLPACK_LIBRARY_DIR COLPACK_INCLUDE_DIR)
-- Could NOT find ARPREC (missing: ARPREC_LIBRARIES ARPREC_INCLUDE_DIR)
-- Linker: GNU gold
-- Could NOT find Ctags (missing: CTAGS_EXECUTABLE)
CMake Error at examples/meta/CMakeLists.txt:11 (message):
  Ctags required for meta examples.  Install or set BUILD_META_EXAMPLES=OFF.


-- Configuring incomplete, errors occurred!
See also "/home/saphire/shogun/build/CMakeFiles/CMakeOutput.log".
See also "/home/saphire/shogun/build/CMakeFiles/CMakeError.log".
saphire@saphire-GL553VE:~/shogun/build$