SgmlFOTBuilder cxx 396 20 warning format expects argument of type int

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SgmlFOTBuilder.cxx:396:20: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long int’ [-Wformat=]
396 | sprintf(buf, "%03d", u.n);
| ~~~^ ~~~
| | |
| int long int
| %03ld