posix/stdio.h open_memstream seems to be wrong
|Reported by:||scottmc||Owned by:||mmu_man|
It's currently defining buf as void:
extern FILE *open_memstream(void **buf, size_t *size);
Open Group shows it as char: http://pubs.opengroup.org/onlinepubs/9699919799/functions/open_memstream.html
This was detected while trying to build leptonica.