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This header is present in SUSv2 and Windows. Also remove the inclusion of <wchar.h>, following clues that it was only included for the benefit of historical systems that didn't have <wctype.h>. Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CA%2BhUKGKAmTgbg_hMiGG5T7pkpzOnY1cWFAHYtZXHCpqeC_hCkA%40mail.gmail.com