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/usr/lib/gcc/x86_64-linux-gnu/6/include/d/std/c/linux/linuxextern.d is in libgphobos-6-dev 6.4.0-17ubuntu1.

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/* Written by Walter Bright.
 * www.digitalmars.com
 * Placed into public domain.
 * Linux(R) is the registered trademark of Linus Torvalds in the U.S. and other
 * countries.
 */

/* These are all the globals defined by the linux C runtime library.
 * Put them separate so they'll be externed - do not link in linuxextern.o
 */

/// Please remove this import. This module is empty and will be deprecated in DMD 2.068.
module std.c.linux.linuxextern;

// No longer needed since "extern" storage class