Index: head/share/mk/bsd.lib.mk
===================================================================
--- head/share/mk/bsd.lib.mk
+++ head/share/mk/bsd.lib.mk
@@ -92,6 +92,12 @@
 CTFFLAGS+= -g
 .endif
 
+# clang currently defaults to dynamic TLS for mips64 object files without -fPIC
+.if ${MACHINE_ARCH:Mmips64*} && ${COMPILER_TYPE} == "clang"
+STATIC_CFLAGS+= -ftls-model=initial-exec
+STATIC_CXXFLAGS+= -ftls-model=initial-exec
+.endif
+
 .include <bsd.libnames.mk>
 
 # prefer .s to a .c, add .po, remove stuff not used in the BSD libraries
Index: head/share/mk/bsd.prog.mk
===================================================================
--- head/share/mk/bsd.prog.mk
+++ head/share/mk/bsd.prog.mk
@@ -82,6 +82,11 @@
 LDFLAGS+= -static
 .endif
 
+# clang currently defaults to dynamic TLS for mips64 binaries
+.if ${MACHINE_ARCH:Mmips64*} && ${COMPILER_TYPE} == "clang"
+CFLAGS+= -ftls-model=initial-exec
+.endif
+
 .if ${MK_DEBUG_FILES} != "no"
 PROG_FULL=${PROG}.full
 # Use ${DEBUGDIR} for base system debug files, else .debug subdirectory