The file rcfile_y.c has been removed from the file list in
po/POTFILES.in. This will exclude the translatable messages from
rcfile_y.c to be included in newbuilt po and pot files.
If rcfile_y.c was removed from the list because xgettext (the
program which extracts translatable messages from source files)
tried to read the file before it was created, I will suggest
this rule to be inserted in po/Makefile.in.in:
# This rule makes sure that rcfile_y.c is generated by yacc/bison
# from rcfile_y.y before xgettext uses it.
../rcfile_y.c: ../rcfile_y.y
cd .. && $(MAKE) rcfile_y.c