groff 1.19.1 complains when formatting its own man pages

[Paul Eggert]

GROFF VERSION:
1.19.1

MACHINE:
Sun Netra T1 200

OS:
Solaris 9

COMPILER:
GCC 3.4.0 (compiled with -gstabs+)

INPUT FILES:
none

COMMAND LINE:
PSPRINT=lp \
BROKEN_SPOOLER_FLAGS=0 \
CFLAGS='-gstabs+ -O2' \
CXXFLAGS='-gstabs+ -O2' \
LDFLAGS=-R/opt/reb/lib/gcc/gcc-3.4.0/lib \
PAGE=letter \
./configure

make install

groff -man /opt/reb/share/man/man1/groff.1 >output.ps

DESCRIPTION OF INCORRECT BEHAVIOUR:

/opt/reb/share/man/man1/groff.1:312: a node is not allowed in a name
/opt/reb/share/man/man1/groff.1:312: bad string definition
/opt/reb/share/man/man1/groff.1:522: a node is not allowed in a name
/opt/reb/share/man/man1/groff.1:522: bad string definition
...

Here is line 312 of the groff.1 file:

.IR roff ,

The other cases seem similar.

SUGGESTED FIX [optional]: