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src/pty.c:
SIGUNUSED -> SIGSYS
The SIGUNUSED define (31) has been removed as part of glibc 2.26, which is used in Fedora 27 and Ubuntu 17.10.
https://bugs.swift.org/browse/SR-6409
src/uterm_vt.c:
Add sys/sysmacros.h
minor was defined in sys/sysmacros.h. So i add the header file uterm_vt.c.