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/usr/lib/gcc/x86_64-linux-gnu/6/include/d/core/sys/linux/errno.d is in libgphobos-6-dev 6.4.0-17ubuntu1.

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/**
 * D header file for GNU/Linux
 *
 * $(LINK2 http://sourceware.org/git/?p=glibc.git;a=blob;f=stdlib/errno.h, glibc stdlib/errno.h)
 */
module core.sys.linux.errno;

version (linux):
extern (C):
nothrow:

public import core.stdc.errno;
import core.sys.linux.config;

static if (__USE_GNU)
{
    extern __gshared char* program_invocation_name, program_invocation_short_name;
    alias error_t = int;
}