depends -sub CXX gcc     &&
depends slibtool LIBTOOL=slibtool-shared &&
optional_depends  tiff                         \
                  "--with-tiff"                \
                  "--without-tiff"             \
                  "TIFF support"               &&
optional_depends  "JPEG"                       \
                  "--with-jpeg"                \
                  "--without-jpeg"             \
                  "for JPEG encoding support"
