/var/tmp/portage/tk-8.4.4/work/tk8.4.4/generic/tk.h:72:9: #error Tk 8.4 must be compiled with tcl.h from Tcl 8.4
please paste emerge -p tcl emerge -p tk
I have to tcl.h, the first in /usr/include and the second in /usr/local/include I removed /usr/local/include/tcl.h and the compilation of tk work.