Hi John,
I saw that too, on SunOS 5.9 as well.
I fixed it by editing the Makefile in my configure directory, removed the relative paths and put in absolute paths.
I presume I could have fixed things on my initial ../gcc-3.4.3/configure operation that cobbled together the Makefile in my gcc-3.4.3-build directory (a peer directory to gcc-3.4.3). But I didn't want to rebuild the compiler on my crusty old SPARC box (quad-CPU SPARC v9 @ 480 MHz).
HTH, --Eljay