Cannot build using --prefix= on mips-sgi-irix6.2

[Billinghurst, David (RTD)]

Trying to build egcs-1.0.3a, gcc-2.8.1 and egcs-19880721 all fail with
the --prefix= option on mips-sgi-irix6.2

Configure using:

/usr/local/imports/egcs-19980721/configure --enable-shared \
--enable-haifa --disable-multilib --prefix=/usr/local/tmp/egcs-19980721

Build using:

make bootstrap

Error is 

cc -c  -DIN_GCC    -g  -DHAVE_CONFIG_H -DHAIFA    -I.
-I/usr/local/imports/egcs-19980721/gcc
-I/usr/local/imports/egcs-19980721/gcc/config
/usr/local/imports/egcs-19980721/gcc/mkstemp.c
gcc  -DIN_GCC    -g  -DHAVE_CONFIG_H -DHAIFA  -o xgcc gcc.o prefix.o
version.o \
  choose-temp.o pexecute.o mkstemp.o  obstack.o     
echo "int xxy_us_dummy;" >tmp-dum.c
./xgcc -B./ -S tmp-dum.c
tmp-dum.c:0: /usr/local/tmp/egcs-19980721/mips-sgi-irix6.2/include/.:
Permission denied
tmp-dum.c:0:
/usr/local/tmp/egcs-19980721/lib/gcc-lib/mips-sgi-irix6.2/egcs-2.91.51/i
nclude/.: Permission denied
make[2]: *** [s-under] Error 1
make[2]: Leaving directory
`/usr/local/imports/BuildTree.irix/egcs-19980721-test/gcc'
make[1]: *** [bootstrap] Error 2
make[1]: Leaving directory
`/usr/local/imports/BuildTree.irix/egcs-19980721-test/gcc'
make: *** [bootstrap] Error 2


Full output from make attached

 <<Make.log.gz>> 
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