indicates to the C program that the killpg() routine is available
to kill process groups.
+d_lchown (d_lchown.U):
+ This variable conditionally defines the HAS_LCHOWN symbol, which
+ indicates to the C program that the lchown() routine is available
+ to operate on a symbolic link (instead of following the link).
+
d_link (d_link.U):
This variable conditionally defines HAS_LINK if link() is
available to create hard links.