Use a GRX 2.4.9 library matching grx/grx20.bi and the executable architecture. The publisher's Windows driver is an i386 driver. On a 64-bit Windows PC, compile this example as a 32-bit executable and use the matching FreeBASIC runtime and GRX archive. The example and binding retain their shared Windows, Linux and DOS source.

The original source archive is grx249.tar.gz. Its SHA-256 checksum is a899956b3ee46492696114d220431405320c64c1f6f058fdfc2b4d6a2beae786, recorded in the maintained FreeBSD port at https://github.com/freebsd/freebsd-ports/blob/main/graphics/grx/distinfo. Preserved copies must match the original archive before building.

The Windows archive links with gdi32 and user32, already selected by the binding. Linux console and X11 builds are separate SDK configurations. For the genuine X11 archive libgrx20X.a, compile with -d GRX_USE_X11; the binding selects grx20X and X11. The default Linux path still selects console grx20. The matching i386 runtime and X11 SDK pass C layouts, independent native X11 pixel readback and the original example on both backends using a private Xvfb display.

The example checks mode selection and cell dimensions before drawing its 256-color grid. It restores text mode before exit. Set FB_EXAMPLE_AUTOPLAY=1 for a bounded run that checks all 256 cell centers without requiring keyboard input; otherwise it waits for a key in the GRX window.