#define INT64_C(__c) __CONCAT_L__(__c,l)
+=head1 Redeclaration of "sendpath" with a different storage class specifier
+
+The following compilation warnings seem to be unavoidable but harmless:
+
+ cc: "/usr/include/sys/socket.h", line 535: warning 562: Redeclaration of "sendfile" with a different storage class specifier: "sendfile" will have internal linkage.
+ cc: "/usr/include/sys/socket.h", line 536: warning 562: Redeclaration of "sendpath" with a different storage class specifier: "sendpath" will have internal linkage.
+
+They seem to be caused by broken system header files, and also other
+open source projects are seeing them.
=head1 Miscellaneous