'single' variant for plplot

[drs@…]

Some packages (outside of macports, perhaps) depend upon the single precision version of plplot. It would be useful if a 'single' variant could be added to the plplot Portfile, e.g.:

bash$ tail Portfile

-DTK_LIBRARY=${prefix}/lib/libtk.dylib

configure.args-append -DPLD_xcairo=OFF \

-DPLD_xwin=OFF \ -DPLD_tk=OFF \ -DENABLE_tk=OFF

}

variant single {

configure.args-append -DPL_DOUBLE=OFF

} bash$

thanks, Darrell