igraph successfully configured.
  GraphML format support -- yes
  GMP library support    -- yes
  GLPK library support   -- yes
  Thread-local storage   -- yes
  Use internal ARPACK    -- yes
  Use internal LAPACK    -- no
  Use internal BLAS      -- no
  Use internal F2C       -- no
  Use internal GLPK      -- no
  Debug build            -- no
  Clang AddressSanitizer -- no
  Verify finally stack   -- no
  Profiling              -- no
  Link time optimization -- no
  CRLF2LF conversion     -- no