diff --git a/lib/Makefile b/lib/Makefile
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -176,10 +176,9 @@
 SUBDIR.${MK_LDNS}+=	libldns
 SUBDIR.${MK_STATS}+=	libstats
 
-# The libraries under libclang_rt can only be built by clang, and only make
-# sense to build when clang is enabled at all.  Furthermore, they can only be
-# built for certain architectures.
-.if ${COMPILER_TYPE} == "clang" && \
+# The libraries under libclang_rt can only be built by clang and when we enable
+# C++ support.  Furthermore, they can only be built for certain architectures.
+.if ${COMPILER_TYPE} == "clang" && ${MK_CXX} != "no" && \
     (${MACHINE_CPUARCH} == "aarch64" || ${MACHINE_CPUARCH} == "amd64" || \
     ${MACHINE_CPUARCH} == "arm" || ${MACHINE_CPUARCH} == "i386" || \
     ${MACHINE_CPUARCH} == "powerpc")