Broken build on powerpc-apple-darwin7.7.0

[Davide Angelocola]

Guile version 1.7.1.

if /bin/sh ../libtool --mode=compile gcc -DHAVE_CONFIG_H -I. -I. -I.. 
-I.. -I.. -I../libguile-ltdl    -g -O2 -Wall -Wmissing-prototypes 
-Werror -MT srfi-13.lo -MD -MP -MF ".deps/srfi-13.Tpo" -c -o srfi-13.lo 
srfi-13.c; \
then mv -f ".deps/srfi-13.Tpo" ".deps/srfi-13.Plo"; else rm -f 
".deps/srfi-13.Tpo"; exit 1; fi
 gcc -DHAVE_CONFIG_H -I. -I. -I.. -I.. -I.. -I../libguile-ltdl -g -O2 
-Wall -Wmissing-prototypes -Werror -MT srfi-13.lo -MD -MP -MF 
.deps/srfi-13.Tpo -c srfi-13.c  -fno-common -DPIC -o .libs/srfi-13.o
srfi-13.c: In function `scm_string_trim_right':
srfi-13.c:771: warning: passing arg 3 of `scm_i_get_substring_spec' 
from incompatible pointer type
srfi-13.c:771: warning: passing arg 5 of `scm_i_get_substring_spec' 
from incompatible pointer type
srfi-13.c: In function `scm_string_xcopy_x':
srfi-13.c:3067: warning: passing arg 5 of `scm_i_get_substring_spec' 
from incompatible pointer type
make[2]: *** [srfi-13.lo] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2

Best Regards,
  -- Davide Angelocola