Tag: Scheme

PLT Scheme 3.99 (revision 10030) for the OLPC XO

DrScheme is very, very close to its 4.0 release. I wanted to try out the newest bits on my OLPC XO using one of the nightly builds, but ran into the same problem as I did last time:

/home/olpc/apps/plt-3.99.0.25/bin/mred: error while loading shared libraries: libGL.so.1: cannot open shared object file: No such file or directory

Some folks have resolved this dependency using Mesa for OpenGL emulation, but I found it easier to prepare a build that doesn’t depend OpenGL.
Here is the tarball and the md5sum for a trunk build that I made at revision 10030.
Here is how I did the build:

./configure --prefix=$WORKDIR/$DESTDIR --disable-gl --disable-shared --enable-origtree
make
make install

Programming the Sony AIBO in Scheme

This post on the PLT discussion list shares some research into programming the Sony AIBO with Scheme, with this followup post providing additional details on a Scheme interpreter (STk) that provides a foreign function interface for the Sony AIBO C++ API.

Perhaps one day those STk libraries will be ported to PLT!

STk

STk is a free R4RS Scheme interpreter which can access the Tk graphical package. Concretely, it can be seen as the standard Tk package where Tcl has been replaced by a Scheme interpreter. STk embeds also an efficient CLOS like object oriented system, called STklos, which provides:

  • multiple inheritance
  • generic functions
  • multi-methods
  • a MOP (Meta Object Protocol)