"Robert V. Baron" writes:
> 
> I tried a clean build from todays sources.  I ran into the
> following problems, so far ...
> 
> 3. lib/libc
> cc -O2 -DALL_STATE  -Wall -Wstrict-prototypes -Wmissing-prototypes -Wpointer-ar\
> ith -Werror   -D_LIBC -DNLS -DYP -DHESIOD -DLIBC_SCCS -DSYSLIBC_SCCS -D_REENTRA\
> NT -I/usr1/src/lib/libc/include -D__DBINTERFACE_PRIVATE -DRESOLVSORT -I. -DPOSI\
> X_MISTAKE -DFLOATING_POINT -nostdinc -idirafter /usr2/BSD/OBJ.0115/usr/include \
> -c nslexer.c
> cc1: warnings being treated as errors
> nslexer.c: In function `_nsyylex':
> nslexer.c:704: warning: label `find_rule' defined but not used
> nslexer.c: At top level:
> nslexer.c:1674: warning: `yy_flex_realloc' defined but not used
> *** Error code 1

reinstall usr.bin/lex, remove nslexer.c, and try again