depends  boost                 &&
depends -sub CXX gcc                   &&
depends  PKG-CONFIG             &&
depends  zlib  '--with-z=yes'  &&

optional_depends  JPEG                      \
                  '--with-jpeg=yes'         \
                  '--with-jpeg=no'          \
                  'for JPEG image support'  &&

optional_depends  libpng                   \
                  '--with-png=yes'         \
                  '--with-png=no'          \
                  'for PNG image support'  &&

optional_depends  tiff                      \
                  '--with-tiff=yes'         \
                  '--with-tiff=no'          \
                  'for TIFF image support'
