master build failure on netbsd

[Greg Troxel]

my autobuild failed this morning:

/bin/ksh ../libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H   -I.. -I.. 
-I../lib -I../lib -I/usr/pkg/include -I/usr/pkg/include -pthread -Wall 
-Wmissing-prototypes -Werror -g -O2 -MT libguile_la-debug.lo -MD -MP -MF 
.deps/libguile_la-debug.Tpo -c -o libguile_la-debug.lo `test -f 'debug.c' || 
echo './'`debug.c
 gcc -DHAVE_CONFIG_H -I.. -I.. -I../lib -I../lib -I/usr/pkg/include 
-I/usr/pkg/include -pthread -Wall -Wmissing-prototypes -Werror -g -O2 -MT 
libguile_la-debug.lo -MD -MP -MF .deps/libguile_la-debug.Tpo -c debug.c  -fPIC 
-DPIC -o .libs/libguile_la-debug.o
cc1: warnings being treated as errors
debug.c: In function 'init_stack_limit':
debug.c:532: warning: comparison is always false due to limited range of data 
type
debug.c:535: warning: comparison is always false due to limited range of data 
type
gmake[3]: *** [libguile_la-debug.lo] Error 1
gmake[3]: Leaving directory `/home/gdt/BUILD-GUILE-master/guile/libguile'
gmake[2]: *** [all] Error 2
gmake[2]: Leaving directory `/home/gdt/BUILD-GUILE-master/guile/libguile'
gmake[1]: *** [all-recursive] Error 1
gmake[1]: Leaving directory `/home/gdt/BUILD-GUILE-master/guile'
gmake: *** [all] Error 2

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