I still haven't successfully completed my first "make build".

cc -O  -Werror   -I/source/netbsd/gnu/usr.bin/gcc/libgcc/../common 
-I/source/netbsd/gnu/usr.bin/gcc/libgcc/../arch  -I/source/netbsd/gnu/usr.
bin/gcc/libgcc/../arch/alpha -nostdinc -idirafter /scratch/netbsd/test/usr
/include -c -DL__gcc_bcmp -o __gcc_bcmp.o /source/netbsd/gnu/usr.bin/gcc/l
ibgcc/libgcc2.c
/source/netbsd/gnu/usr.bin/gcc/libgcc/libgcc2.c:33: tconfig.h: No such 
file or directory
*** Error code 1

Stop.
*** Error code 1

Stop.

I've figured out that tconfig.h should probably live in 
/source/netbsd/gnu/usr.bin/gcc/libgcc/../arch/alpha, but that directory 
doesn't even exist.  I have seven arch's from arm32 to vax, but no alpha. 
 Should I have it?  How in the world could I have lost it?  How can I 
replace it?