tclConfig.sh is changed in do_install for cross compile and is installed to STAGING_BINDIR_CROSS, which can be used by other package like 'expect' with option --with-tcl=${STAGING_BINDIR_CROSS}, but if SSTATE_DIR is set and tcl is from sstage, tclConfig.sh can't be found there.
Fixed: http://cgit.openembedded.org/openembedded-core/commit/?id=7a97abb3f1c2ff8fd2dc7c59f866430cf99ab82d
Verifief in 1.3_M3