Strange(?) warning(?) in rebuild of 2.1.3

[David Ronis <ronis at ronispc dot chem dot mcgill dot ca>]

I just finished rebuilding 2.1.3 on a newly built i686-linux-gnu box
[with Slackware-7.1, version 2.95.2 of gcc,  3.77 of make (gnu),  and
version 2.04 of bash].   I used a clean tarfile from ftp.gnu.org,
included crypt and linuxthreads add-ons, and configured with
--prefix=/usr and --enable-add-ons.  The build and subsequent make check
seemed to work except hundreds of the following type of error message:


make  -C stdlib tests
make[1]: Entering directory
`/home/ronis/Project/notar/glibc-2.1.3/stdlib'

[snip]

./sysdeps/libm-i387/i686 -I../sysdeps/i386/fpu -I../sysdeps/libm-i387
-I../sysdeps/i386 -I../sysdeps/wordsize-32 -I../sysdeps/ieee754
-I../sysdeps/libm-ieee754 -I../sysdeps/generic/elf -I../sysdeps/generic'
> isomac.out
/bin/sh: invalid character 45 in exportstr for full-config-sysdirs  <===

The last line is the problem and always appears in the same way.  I've
greped for full-config-sysdirs in the top directory and  found:

MakeTAGS:sysdep-dirs := $(full-config-sysdirs)
Makeconfig:export full-config-sysdirs := $(addprefix
$(..),$(config-sysdirs))
Makeconfig:                            $(foreach
dir,$(full-config-sysdirs),\
Makerules:sysdirs = $(strip $(full-config-sysdirs))
Makerules:+sysdep_dirs := $(full-config-sysdirs)

The export in Makeconfig is probably the problem, but darned if I know
what it is.

In any event,  is it safe to install?

David