Warnings compiling preproc.y

Compiling HEAD I see the following 2 warnings:

...
make[4]: Leaving directory `/home/viy/prj/pgb/src/interfaces/ecpg/compatlib'
make -C preproc all
make[4]: Entering directory `/home/viy/prj/pgb/src/interfaces/ecpg/preproc'
make -C ../../../../src/port all
make[5]: Entering directory `/home/viy/prj/pgb/src/port'
make[5]: Nothing to be done for `all'.
make[5]: Leaving directory `/home/viy/prj/pgb/src/port'
bison -y -d preproc.y
mv -f y.tab.c ./preproc.c
mv -f y.tab.h ./preproc.h
/usr/bin/flex -o'pgc.c' pgc.l
gcc -O2 -ggdb -DBITMAP_DEBUG -Wall -Wmissing-prototypes -Wpointer-arith
-Wendif-labels -fno-strict-aliasing -g -Wno-error -I./../include -I.
-I../../../../src/include -D_GNU_SOURCE -DMAJOR_VERSION=4 -DMINOR_VERSION=1
-DPATCHLEVEL=1 -c -o preproc.o preproc.c -MMD
In file included from preproc.y:6416:
pgc.c: In function `yylex':
pgc.c:1503: warning: label `find_rule' defined but not used
preproc.y: At top level:
pgc.c:3559: warning: `yy_flex_realloc' defined but not used

Should those variables be removed?

--

Victor Y. Yegorov