Neither pread() / pwrite() nor O_DIRECTORY are available from glibc 2.11.3 headers without defining (e.g.) _GNU_SOURCE. Supplying the definition unconditionally shouldn't be a problem, seeing that various other tools/ components do so, too.
Signed-off-by: Jan Beulich <jbeul...@suse.com> --- a/tools/9pfsd/Makefile +++ b/tools/9pfsd/Makefile @@ -5,7 +5,7 @@ XEN_ROOT = $(CURDIR)/../.. include $(XEN_ROOT)/tools/Rules.mk -CFLAGS += $(PTHREAD_CFLAGS) +CFLAGS += $(PTHREAD_CFLAGS) -D_GNU_SOURCE LDFLAGS += $(PTHREAD_LDFLAGS) TARGETS := xen-9pfsd
