Sorry, I wasn't explicit enough. When I say "cross-compile binutils", I
mean exactly that: I'm building binutils with a cross-compiler, so that
the resulting executable will run on a different architecture.
But, when I look at the binutils/Makefile, I see that the STRIP variable
is simply set to "strip", not the cross-compiler version of "strip". So
if I invoke "make install-strip" directly from within the binutils
subdirectory rather than from the top level, the cross-compiler version
of STRIP is not set and it tries to use "strip" instead... which fails.