sed errors

make  all-recursive
make[1]: Entering directory '/path/src/sed'
Making all in po
make[2]: Entering directory '/path/src/sed/po'
make[2]: Nothing to be done for 'all'.
make[2]: Leaving directory '/path/src/sed/po'
Making all in .
make[2]: Entering directory '/path/src/sed'
  MAKEINFO doc/sed.info
./doc/sed.texi:3368: unknown command `U'
./doc/sed.texi:3368: misplaced {
./doc/sed.texi:3368: misplaced }
./doc/sed.texi:3381: unknown command `U'
./doc/sed.texi:3381: misplaced {
./doc/sed.texi:3381: misplaced }
./doc/sed.texi:3413: unknown command `U'
./doc/sed.texi:3413: misplaced {
./doc/sed.texi:3413: misplaced }
./doc/sed.texi:3421: unknown command `U'
./doc/sed.texi:3421: misplaced {
./doc/sed.texi:3421: misplaced }
./doc/sed.texi:3424: unknown command `U'
./doc/sed.texi:3424: misplaced {
./doc/sed.texi:3424: misplaced }
./doc/sed.texi:3508: unknown command `U'
./doc/sed.texi:3508: misplaced {
./doc/sed.texi:3508: misplaced }
./doc/sed.texi:3508: unknown command `U'
./doc/sed.texi:3508: misplaced {
./doc/sed.texi:3508: misplaced }
./doc/sed.texi:3509: unknown command `U'
./doc/sed.texi:3509: misplaced {
./doc/sed.texi:3509: misplaced }
./doc/sed.texi:3545: unknown command `U'
./doc/sed.texi:3545: misplaced {
./doc/sed.texi:3545: misplaced }
./doc/sed.texi:3548: unknown command `U'
./doc/sed.texi:3548: misplaced {
./doc/sed.texi:3548: misplaced }
Makefile:2681: recipe for target 'doc/sed.info' failed
make[2]: *** [doc/sed.info] Error 1