Added a --with-pkgdir option, to give configure a new place to look for all of the optional package files (Tcl, Tk, etc library and binaries).
Added a --with-pkgdir option, to give configure a new place to look for
all of the optional package files (Tcl, Tk, etc library and binaries).

svn path=/trunk/; revision=1849

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot