Index: gcc/c-family/c-common.c
===================================================================
--- gcc/c-family/c-common.c	(revision 196316)
+++ gcc/c-family/c-common.c	(working copy)
@@ -550,6 +550,18 @@ const struct c_common_resword c_common_r
   { "volatile",		RID_VOLATILE,	0 },
   { "wchar_t",		RID_WCHAR,	D_CXXONLY },
   { "while",		RID_WHILE,	0 },
+
+  /* Concepts-related keywords */
+  { "assume",		RID_ASSUME,	D_CXXONLY | D_CXX0X | D_CXXWARN },
+  { "axiom",		RID_AXIOM,	D_CXXONLY | D_CXX0X | D_CXXWARN },
+  { "concept",		RID_CONCEPT,	D_CXXONLY | D_CXX0X | D_CXXWARN },
+  { "forall", 		RID_FORALL,	D_CXXONLY | D_CXX0X | D_CXXWARN },
+  { "requires", 	RID_REQUIRES,	D_CXXONLY | D_CXX0X | D_CXXWARN },
+  { "__declval",        RID_DECLVAL,    D_CXXONLY | D_CXX0X | D_CXXWARN },
+  { "__is_same",        RID_IS_SAME,    D_CXXONLY | D_CXX0X | D_CXXWARN },
+  { "__is_valid_expr",  RID_IS_VALID_EXPR, D_CXXONLY | D_CXX0X | D_CXXWARN },
+  { "__is_valid_type",  RID_IS_VALID_TYPE, D_CXXONLY | D_CXX0X | D_CXXWARN },
+
   /* These Objective-C keywords are recognized only immediately after
      an '@'.  */
   { "compatibility_alias", RID_AT_ALIAS,	D_OBJC },
Index: gcc/c-family/c-common.h
===================================================================
--- gcc/c-family/c-common.h	(revision 196316)
+++ gcc/c-family/c-common.h	(working copy)
@@ -148,6 +148,14 @@ enum rid
   /* C++11 */
   RID_CONSTEXPR, RID_DECLTYPE, RID_NOEXCEPT, RID_NULLPTR, RID_STATIC_ASSERT,
 
+  /* C++ concepts */
+  RID_ASSUME,    RID_AXIOM,        RID_CONCEPT,
+  RID_FORALL,    RID_REQUIRES,
+
+  /* C++ concepts (intrinsics) */
+  RID_DECLVAL,       RID_IS_SAME,
+  RID_IS_VALID_EXPR, RID_IS_VALID_TYPE,
+
   /* Objective-C ("AT" reserved words - they are only keywords when
      they follow '@')  */
   RID_AT_ENCODE,   RID_AT_END,