[PATCH net-next v1] doc: net: fix txtimestamp build

[David Decotigny]

From: David Decotigny <decot@xxxxxxxxxxxx>

Signed-off-by: David Decotigny <decot@xxxxxxxxxxxx>
---
 Documentation/networking/timestamping/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/networking/timestamping/Makefile b/Documentation/networking/timestamping/Makefile
index 8c20dfa..80a3ce0 100644
--- a/Documentation/networking/timestamping/Makefile
+++ b/Documentation/networking/timestamping/Makefile
@@ -10,5 +10,6 @@ hostprogs-y := hwtstamp_config timestamping txtimestamp
 always := $(hostprogs-y)
 
 HOSTCFLAGS_timestamping.o += -I$(objtree)/usr/include
+HOSTCFLAGS_txtimestamp.o += -D_GNU_SOURCE
 HOSTCFLAGS_txtimestamp.o += -I$(objtree)/usr/include
 HOSTCFLAGS_hwtstamp_config.o += -I$(objtree)/usr/include
-- 
2.2.0.rc0.207.ga3a616c

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