libtextstyle-optional fails ./gnulib-tool --test

[Paul Eggert]

The command "./gnulib-tool --test libtextstyle-optional" fails with the 
last few output lines as follows. I tried going back into the past but 
didn't find an old Gnulib version where the command worked (though the 
failure symptoms differed), so I don't think this is purely due to 
recent Gnulib changes.


gcc -DHAVE_CONFIG_H -I. -I../../gltests -DGNULIB_STRICT_CHECKING=1 -I. 
-I../../gltests -I.. -I../../gltests/.. -I../gllib 
-I../../gltests/../gllib -DSRCDIR=\"../../gltests/\"   -Wno-error -g -O2 
-MT test_libtextstyle-test-libtextstyle.o -MD -MP -MF 
.deps/test_libtextstyle-test-libtextstyle.Tpo -c -o 
test_libtextstyle-test-libtextstyle.o `test -f 'test-libtextstyle.c' || 
echo '../../gltests/'`test-libtextstyle.c
../../gltests/test-libtextstyle.c:20:10: fatal error: textstyle.h: No 
such file or directory
   20 | #include <textstyle.h>
      |          ^~~~~~~~~~~~~
compilation terminated.
make[4]: *** [Makefile:2239: test_libtextstyle-test-libtextstyle.o] Error 1
make[4]: Leaving directory 
'/home/eggert/src/gnu/gnulib-tmp/testdir1900592/build/gltests'
make[3]: *** [Makefile:2259: all-recursive] Error 1