depends zlib &&
depends           perl                                           &&
optional_depends  gmp  ""  "--without-gmp"  "for GMP support"    &&
optional_depends  gdbm ""  "--without-gdbm" "for GDBM support"   &&
optional_depends  icu  ""  "--without-icu"  "for ICU support"    &&
optional_depends  GLUT     ''  '--without-opengl' "OpenGL support" &&
optional_depends  SSL  '' '--without-crypto' 'crypto support'  &&
optional_depends  pcre     '' '--without-pcre' 'regex support'   &&
optional_depends  readline '' '' 'line editing'    &&
optional_depends  gettext  '' '--without-gettext' 'multilingual support' &&
optional_depends  libffi   '' '--without-libffi' 'message passing'
optional_depends  llvm     '--with-llvm' '' 'Link to LLVM'

.