Hi,
According to the NEWS file, SBCL 1.5.0 and later can also be bootstrapped using ECL: --- changes in sbcl-1.5.0 relative to sbcl-1.4.16: [...] * build enhancement: new host quirks mechanism, support for building under ABCL and ECL (as well as CCL, CMUCL, CLISP and SBCL itself) [...] --- Maybe it could be used to have the same bootstrap procedure for all systems.