xfonts-utils depends on libxfont-dev which should be sufficient to build. Although libxfont-dev depends on libx11-dev, it's a versionless dependency which means that it can be satisfied with X.org 6.9.0 series. Perhaps this bug should be moved to the libxfont-dev package? Speaking of which, why is libxfont-dev only available on sparc and i386? Nick Lewycky