diff --git a/lib/libc/Makefile b/lib/libc/Makefile
--- a/lib/libc/Makefile
+++ b/lib/libc/Makefile
@@ -29,6 +29,7 @@
 
 LIB=c
 SHLIB_MAJOR= 7
+SYMBOLS_REF_MD=
 .if ${MK_SSP} != "no" && \
     (${LIBC_ARCH} == "i386" || ${LIBC_ARCH:Mpowerpc*} != "")
 SHLIB_LDSCRIPT=libc.ldscript
diff --git a/lib/libcxxrt/Makefile b/lib/libcxxrt/Makefile
--- a/lib/libcxxrt/Makefile
+++ b/lib/libcxxrt/Makefile
@@ -4,6 +4,7 @@
 SRCDIR=		${SRCTOP}/contrib/libcxxrt
 
 SHLIB_MAJOR=	1
+SYMBOLS_REF_MD=
 SHLIBDIR?=	/lib
 
 .PATH: ${SRCDIR}
diff --git a/lib/libgcc_s/Makefile b/lib/libgcc_s/Makefile
--- a/lib/libgcc_s/Makefile
+++ b/lib/libgcc_s/Makefile
@@ -1,6 +1,7 @@
 
 PACKAGE=	clibs
 SHLIB_NAME=	libgcc_s.so.1
+SYMBOLS_REF_MD=
 SHLIBDIR?=	/lib
 
 # Enabling UBSan triggers "undefined reference to vtable for __cxxabiv1::__function_type_info"
diff --git a/lib/libsys/Makefile b/lib/libsys/Makefile
--- a/lib/libsys/Makefile
+++ b/lib/libsys/Makefile
@@ -20,6 +20,7 @@
 
 LIB=sys
 SHLIB_MAJOR= 7
+SYMBOLS_REF_MD=
 WARNS?=	2
 MK_SSP=		no
 
diff --git a/lib/libthr/Makefile b/lib/libthr/Makefile
--- a/lib/libthr/Makefile
+++ b/lib/libthr/Makefile
@@ -14,6 +14,7 @@
 
 LIB=thr
 SHLIB_MAJOR= 3
+SYMBOLS_REF_MD=
 
 NO_WTHREAD_SAFETY=1
 NO_WCAST_ALIGN.gcc=1    # for gcc 4.2