tcl error

dear all

i tried using tcl with ./configure --with-tcl.
errors appear when make:
make[4]: Entering directory `/home/sm/pgsql7.4/src/pl/plpgsql/src'
bison -y -d gram.y
NONE:0: /usr/bin/m4: ERROR: EOF in string
sed -e 's/yy/plpgsql_yy/g' -e 's/YY/PLPGSQL_YY/g' < y.tab.c > ./pl_gram.c
/bin/sh: line 1: y.tab.c: No such file or directory
make[4]: *** [pl.tab.h] Error 1
make[4]: Leaving directory `/home/sm/pgsql7.4/src/pl/plpgsql/src'
make[3]: *** [all] Error 2
make[3]: Leaving directory `/home/sm/pgsql7.4/src/pl/plpgsql'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/home/sm/pgsql7.4/src/pl'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/home/sm/pgsql7.4/src'
make: *** [all] Error 2

what's wrong with it?

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　　　　　　　　帅猛
　　　　　　　　shuaimeng(at)db(dot)pku(dot)edu(dot)cn
　　　　　　　　　　2004-04-28