diff --git a/lib/atf/libatf-c++/Makefile b/lib/atf/libatf-c++/Makefile
index 03e7d19c4440..cacf87520d2d 100644
--- a/lib/atf/libatf-c++/Makefile
+++ b/lib/atf/libatf-c++/Makefile
@@ -48,6 +48,9 @@ CFLAGS+=	-I.
 
 CFLAGS+=	-DHAVE_CONFIG_H
 
+# Silence warnings about usage of deprecated std::auto_ptr
+CXXWARNFLAGS+=	-Wno-deprecated-declarations
+
 SRCS=		application.cpp \
 		build.cpp \
 		check.cpp \
diff --git a/lib/googletest/Makefile.inc b/lib/googletest/Makefile.inc
index cf6e98b5d8ab..319ce6ec7ec6 100644
--- a/lib/googletest/Makefile.inc
+++ b/lib/googletest/Makefile.inc
@@ -8,4 +8,7 @@ GOOGLETEST_SRCROOT= ${GTEST_DIR}/googletest
 
 CXXFLAGS+=	${GTESTS_FLAGS}
 
+# Silence warnings about usage of deprecated std::auto_ptr
+CXXWARNFLAGS+=	-Wno-deprecated-declarations
+
 WARNS?=		6
diff --git a/lib/libdevdctl/Makefile b/lib/libdevdctl/Makefile
index 5a18a14af622..60c59c0ea929 100644
--- a/lib/libdevdctl/Makefile
+++ b/lib/libdevdctl/Makefile
@@ -18,4 +18,8 @@ WARNS?=	3
 PRIVATELIB=	true
 SHLIB_MAJOR=	0
 
+# Silence warnings about usage of deprecated std::auto_ptr, and various
+# deprecated function objects from <functional>
+CXXWARNFLAGS+=	-Wno-deprecated-declarations
+
 .include <bsd.lib.mk>
diff --git a/lib/libpmc/Makefile b/lib/libpmc/Makefile
index 35af606a7225..03b8ac44af95 100644
--- a/lib/libpmc/Makefile
+++ b/lib/libpmc/Makefile
@@ -32,6 +32,9 @@ WARNS?=	3
 CFLAGS+= -I${.CURDIR}
 CWARNFLAGS.gcc+= -Wno-shadow -Wno-cast-align
 
+# Silence warnings about usage of deprecated std::auto_ptr
+CXXWARNFLAGS+=	-Wno-deprecated-declarations
+
 MAN=	pmc.3
 MAN+=	pmc_allocate.3
 MAN+=	pmc_attach.3
diff --git a/libexec/atf/atf-check/Makefile b/libexec/atf/atf-check/Makefile
index 4fe6e4e7dbb9..b6ef6778403a 100644
--- a/libexec/atf/atf-check/Makefile
+++ b/libexec/atf/atf-check/Makefile
@@ -38,6 +38,9 @@ MAN=		atf-check.1
 CFLAGS+=	-I${ATF}
 CFLAGS+=	-DATF_SHELL='"/bin/sh"'
 
+# Silence warnings about usage of deprecated std::auto_ptr
+CXXWARNFLAGS+=	-Wno-deprecated-declarations
+
 LIBADD=		atf_cxx
 
 HAS_TESTS=
diff --git a/libexec/atf/atf-sh/Makefile b/libexec/atf/atf-sh/Makefile
index dd8cfaf1775d..d04816f8a591 100644
--- a/libexec/atf/atf-sh/Makefile
+++ b/libexec/atf/atf-sh/Makefile
@@ -65,6 +65,9 @@ CFLAGS+=	-DATF_PKGDATADIR='"${SHAREDIR}/atf"'
 CFLAGS+=	-DATF_SHELL='"/bin/sh"'
 CFLAGS+=	-I${ATF}
 
+# Silence warnings about usage of deprecated std::auto_ptr
+CXXWARNFLAGS+=	-Wno-deprecated-declarations
+
 LIBADD=		atf_cxx
 
 FILESGROUPS=	SUBR
diff --git a/share/mk/atf.test.mk b/share/mk/atf.test.mk
index 28470f2e080d..e7a8c82b7a8f 100644
--- a/share/mk/atf.test.mk
+++ b/share/mk/atf.test.mk
@@ -55,6 +55,8 @@ LDADD.${_T}+= ${LIBATF_CXX} ${LIBATF_C}
 .endif
 TEST_INTERFACE.${_T}= atf
 .endfor
+# Silence warnings about usage of deprecated std::auto_ptr
+CXXWARNFLAGS+=	-Wno-deprecated-declarations
 .endif
 
 .if !empty(ATF_TESTS_SH)