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-rw-r--r--sysdeps/mach/hurd/kernel-features.h1
-rw-r--r--sysdeps/nacl/kernel-features.h1
-rw-r--r--sysdeps/unix/sysv/linux/kernel-features.h1
3 files changed, 0 insertions, 3 deletions
diff --git a/sysdeps/mach/hurd/kernel-features.h b/sysdeps/mach/hurd/kernel-features.h
index 687c7f0eb6..60c5bca01b 100644
--- a/sysdeps/mach/hurd/kernel-features.h
+++ b/sysdeps/mach/hurd/kernel-features.h
@@ -21,5 +21,4 @@
    But those referring to POSIX-level features like O_* flags can be.  */
 
 #define __ASSUME_O_CLOEXEC	1
-#define __ASSUME_DUP3		1
 #define __ASSUME_ACCEPT4	1
diff --git a/sysdeps/nacl/kernel-features.h b/sysdeps/nacl/kernel-features.h
index 38a47f16b4..4a5808b56c 100644
--- a/sysdeps/nacl/kernel-features.h
+++ b/sysdeps/nacl/kernel-features.h
@@ -23,6 +23,5 @@
 #define __ASSUME_O_CLOEXEC	1
 
 /*
-#define __ASSUME_DUP3		1
 #define __ASSUME_ACCEPT4	1
 */
diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h
index 233e302c0d..e0eb4e2f84 100644
--- a/sysdeps/unix/sysv/linux/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/kernel-features.h
@@ -74,7 +74,6 @@
 /* Support for various CLOEXEC and NONBLOCK flags was added in
    2.6.27.  */
 #define __ASSUME_IN_NONBLOCK	1
-#define __ASSUME_DUP3		1
 
 /* Support for accept4 functionality was added in 2.6.28, but for some
    architectures using a separate syscall rather than socketcall that