diff --git a/mk/rt.mk b/mk/rt.mk
index d8490230675..a7f09e63ce0 100644
--- a/mk/rt.mk
+++ b/mk/rt.mk
@@ -92,14 +92,7 @@ RUNTIME_CXXS_$(1)_$(2) := \
               rt/rust_android_dummy.cpp \
               rt/rust_test_helpers.cpp
 
-RUNTIME_CS_$(1)_$(2) := rt/sundown/src/autolink.c \
-			rt/sundown/src/buffer.c \
-			rt/sundown/src/stack.c \
-			rt/sundown/src/markdown.c \
-			rt/sundown/html/houdini_href_e.c \
-			rt/sundown/html/houdini_html_e.c \
-			rt/sundown/html/html_smartypants.c \
-			rt/sundown/html/html.c
+RUNTIME_CS_$(1)_$(2) :=
 
 RUNTIME_S_$(1)_$(2) := rt/arch/$$(HOST_$(1))/_context.S \
 			rt/arch/$$(HOST_$(1))/record_sp.S
@@ -109,8 +102,6 @@ RT_BUILD_DIR_$(1)_$(2) := $$(RT_OUTPUT_DIR_$(1))/stage$(2)
 RUNTIME_DEF_$(1)_$(2) := $$(RT_OUTPUT_DIR_$(1))/rustrt$$(CFG_DEF_SUFFIX_$(1))
 RUNTIME_INCS_$(1)_$(2) := -I $$(S)src/rt -I $$(S)src/rt/isaac -I $$(S)src/rt/uthash \
                      -I $$(S)src/rt/arch/$$(HOST_$(1)) \
-                     -I $$(S)src/rt/sundown/src \
-                     -I $$(S)src/rt/sundown/html \
                      -I $$(S)src/libuv/include
 RUNTIME_OBJS_$(1)_$(2) := $$(RUNTIME_CXXS_$(1)_$(2):rt/%.cpp=$$(RT_BUILD_DIR_$(1)_$(2))/%.o) \
                      $$(RUNTIME_CS_$(1)_$(2):rt/%.c=$$(RT_BUILD_DIR_$(1)_$(2))/%.o) \
@@ -242,6 +233,33 @@ $$(LIBUV_LIB_$(1)): $$(LIBUV_DEPS) $$(LIBUV_MAKEFILE_$(1))
 		NO_LOAD="$$(LIBUV_NO_LOAD)" \
 		V=$$(VERBOSE)
 endif
+
+SUNDOWN_NAME_$(1) := $$(call CFG_STATIC_LIB_NAME_$(1),sundown)
+SUNDOWN_DIR_$(1) := $$(RT_OUTPUT_DIR_$(1))/sundown
+SUNDOWN_LIB_$(1) := $$(SUNDOWN_DIR_$(1))/$$(SUNDOWN_NAME_$(1))
+
+SUNDOWN_CS_$(1) := rt/sundown/src/autolink.c \
+			rt/sundown/src/buffer.c \
+			rt/sundown/src/stack.c \
+			rt/sundown/src/markdown.c \
+			rt/sundown/html/houdini_href_e.c \
+			rt/sundown/html/houdini_html_e.c \
+			rt/sundown/html/html_smartypants.c \
+			rt/sundown/html/html.c
+
+SUNDOWN_OBJS_$(1) := $$(SUNDOWN_CS_$(1):rt/%.c=$$(SUNDOWN_DIR_$(1))/%.o)
+
+$$(SUNDOWN_DIR_$(1))/%.o: rt/%.c
+	@$$(call E, compile: $$@)
+	@mkdir -p $$(@D)
+	$$(Q)$$(call CFG_COMPILE_C_$(1), $$@, \
+		-I $$(S)src/rt/sundown/src -I $$(S)src/rt/sundown/html \
+                 $$(RUNTIME_CFLAGS_$(1))) $$<
+
+$$(SUNDOWN_LIB_$(1)): $$(SUNDOWN_OBJS_$(1))
+	@$$(call E, link: $$@)
+	$$(Q)$$(AR_$(1)) rcs $$@ $$^
+
 endef
 
 # Instantiate template for all stages/targets
diff --git a/mk/tools.mk b/mk/tools.mk
index ed4ae10e3e2..fb2e0b6367c 100644
--- a/mk/tools.mk
+++ b/mk/tools.mk
@@ -57,10 +57,12 @@ $$(TLIB$(1)_T_$(4)_H_$(3))/$(CFG_LIBRUSTDOC_$(4)):		\
 		$$(RUSTDOC_LIB) $$(RUSTDOC_INPUTS)			\
 		$$(SREQ$(1)_T_$(4)_H_$(3))			\
 		$$(TLIB$(1)_T_$(4)_H_$(3))/$(CFG_LIBRUSTC_$(4)) \
+		$$(SUNDOWN_LIB_$(4)) \
 		| $$(TLIB$(1)_T_$(4)_H_$(3))/
 	@$$(call E, compile_and_link: $$@)
 	$$(call REMOVE_ALL_OLD_GLOB_MATCHES_EXCEPT,$$(dir $$@),$(LIBRUSTDOC_GLOB_$(4)),$$(notdir $$@))
-	$$(STAGE$(1)_T_$(4)_H_$(3)) $$(WFLAGS_ST$(1)) --out-dir $$(@D) $$< && touch $$@
+	$$(STAGE$(1)_T_$(4)_H_$(3)) $$(WFLAGS_ST$(1)) \
+		-L $$(SUNDOWN_DIR_$(4)) --out-dir $$(@D) $$< && touch $$@
 	$$(call LIST_ALL_OLD_GLOB_MATCHES_EXCEPT,$$(dir $$@),$(LIBRUSTDOC_GLOB_$(4)),$$(notdir $$@))
 
 $$(TBIN$(1)_T_$(4)_H_$(3))/rustdoc$$(X_$(4)):			\
diff --git a/src/librustdoc/html/markdown.rs b/src/librustdoc/html/markdown.rs
index f4a61e87993..fbe7a965615 100644
--- a/src/librustdoc/html/markdown.rs
+++ b/src/librustdoc/html/markdown.rs
@@ -69,6 +69,7 @@ struct buf {
 }
 
 // sundown FFI
+#[link_args = "-lsundown"]
 extern {
     fn sdhtml_renderer(callbacks: *sd_callbacks,
                        options_ptr: *html_renderopt,
diff --git a/src/rt/rustrt.def.in b/src/rt/rustrt.def.in
index 60e4d3abd7a..01b3c97aa1c 100644
--- a/src/rt/rustrt.def.in
+++ b/src/rt/rustrt.def.in
@@ -183,12 +183,6 @@ rust_uv_pipe_init
 rust_uv_signal_init
 rust_uv_signal_start
 rust_uv_signal_stop
-sdhtml_renderer
-sd_markdown_new
-sd_markdown_render
-sd_markdown_free
-bufrelease
-bufnew
 rust_take_dlerror_lock
 rust_drop_dlerror_lock
 rust_uv_pipe_open