New comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/pull/28681#issuecomment-778361879

Comment:
Cross builds are running a bunch of these, but for the host, to generate headers:

```
forming have_unistd.h
have_unistd.h formed
forming have_stdlib.h
have_stdlib.h formed
gcc -DCALC_SRC -DCUSTOM -Wall  -march=native   -fPIC longbits.c -c
rm -f longbits
gcc -DCALC_SRC -DCUSTOM -Wall  -march=native   -fPIC longbits.o -o longbits
forming longbits.h
longbits.h formed
forming align32.h
align32.h formed
forming have_string.h
have_string.h formed
forming args.h
args.h formed
forming calcerr.h
calcerr.h formed
forming conf.h
conf.h formed
gcc -DCALC_SRC -DCUSTOM -Wall  -march=native   -fPIC  endian.c -c
rm -f endian
gcc -DCALC_SRC -DIt's likely to beCUSTOM -Wall  -march=native   -fPIC endian.o -o endian
forming endian_calc.h
endian_calc.h formed
forming have_fpos.h
have_fpos.h formed
forming have_posscl.h
have_posscl.h formed
forming have_fpos_pos.h
have_fpos_pos.h formed
forming have_offscl.h
have_offscl.h formed
forming fposval.h
fposval.h formed
forming have_const.h
have_const.h formed
forming have_memmv.h
have_memmv.h formed
forming have_newstr.h
have_newstr.h formed
forming have_times.h
have_times.h formed
forming have_uid_t.h
have_uid_t.h formed
forming terminal.h
terminal.h formed
forming have_ustat.h
have_ustat.h formed
forming have_getsid.h
have_getsid.h formed
forming have_getpgid.h
have_getpgid.h formed
forming have_gettime.h
have_gettime.h formed
forming have_getprid.h
have_getprid.h formed
forming have_urandom.h
have_urandom.h formed
forming have_rusage.h
have_rusage.h formed
forming have_strdup.h
have_strdup.h formed
forming have_unused.h
have_unused.h formed
forming calcerr.c
calcerr.c formed
```

And most are likely to be quite wrong, I think.