diff --git a/lib/Makefile b/lib/Makefile
index 884e3103c064..ab5ae75b7ab9 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -40,9 +40,12 @@ _csu=csu/${MACHINE_ARCH}
 _csu=csu
 .endif
 
+# libc_r is obsolete on ia64.
+.if ${MACHINE_ARCH} != "ia64"
 .if !defined(NOLIBC_R)
 _libc_r=	libc_r
 .endif
+.endif
 
 .if !defined(NO_BIND)
 _libbind=	libbind
@@ -69,6 +72,9 @@ _libthr=	libthr
 .endif
 
 .if ${MACHINE_ARCH} == "ia64"
+.if !defined(NOLIBPTHREAD)
+_libpthread=	libpthread
+.endif
 .if !defined(NOLIBTHR)
 _libthr=	libthr
 .endif