diff --git a/Makefile.in b/Makefile.in
index 5ddf5b784e7..ca404b1e24a 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -1081,7 +1081,7 @@ CRATE_DEPFILES := $(subst $(S)src/,,$(ALL_TEST_CRATES:%.rc=%.d)) \
 boot/$(CFG_STDLIB).d: $(STDLIB_CRATE) $(STDLIB_INPUTS) \
                       $(MKFILES) boot/rustboot$(X)
 	@$(call E, dep: $@)
-	$(BOOT) -o $(patsubst %.d,%,$@) -shared -rdeps $< >$@.tmp
+	$(BOOT) -o $(patsubst %.d,%$(X),$@) -shared -rdeps $< >$@.tmp
 	$(Q)$(CFG_PATH_MUNGE) $@.tmp
 	$(Q)rm -f $@.tmp.bak
 	$(Q)mv $@.tmp $@
@@ -1089,14 +1089,14 @@ boot/$(CFG_STDLIB).d: $(STDLIB_CRATE) $(STDLIB_INPUTS) \
 stage0/rustc$(X).d: $(COMPILER_CRATE) $(COMPILER_INPUTS) \
                     $(STDLIB_CRATE) $(MKFILES) boot/rustboot$(X)
 	@$(call E, dep: $@)
-	$(BOOT) -o $(patsubst %.d,%,$@) -shared -rdeps $< >$@.tmp
+	$(BOOT) -o $(patsubst %.d,%$(X),$@) -shared -rdeps $< >$@.tmp
 	$(Q)$(CFG_PATH_MUNGE) $@.tmp
 	$(Q)rm -f $@.tmp.bak
 	$(Q)mv $@.tmp $@
 
 %.d: %.rc $(MKFILES) boot/rustboot$(X)
 	@$(call E, dep: $@)
-	$(BOOT)  -o $(patsubst %.d,%,$@) -rdeps $< >$@.tmp
+	$(BOOT)  -o $(patsubst %.d,%$(X),$@) -rdeps $< >$@.tmp
 	$(Q)$(CFG_PATH_MUNGE) $@.tmp
 	$(Q)rm -f $@.tmp.bak
 	$(Q)mv $@.tmp $@
diff --git a/src/rt/rust_builtin.cpp b/src/rt/rust_builtin.cpp
index 2de9d7f47ac..3f2ae511551 100644
--- a/src/rt/rust_builtin.cpp
+++ b/src/rt/rust_builtin.cpp
@@ -417,9 +417,9 @@ rust_str* c_str_to_rust(rust_task *task, char const *str) {
     return vec_alloc_with_data(task, len, len, 1, (void*)str);
 }
 
-#if defined(__WIN32__)
 extern "C" CDECL rust_vec*
 rust_list_files(rust_task *task, rust_str *path) {
+#if defined(__WIN32__)
     array_list<rust_str*> strings;
     WIN32_FIND_DATA FindFileData;
     HANDLE hFind = FindFirstFile((char*)path->data, &FindFileData);
@@ -431,6 +431,15 @@ rust_list_files(rust_task *task, rust_str *path) {
     }
     return vec_alloc_with_data(task, strings.size(), strings.size(),
                                sizeof(rust_str*), strings.data());
+#else
+    return NULL;
+#endif
+}
+
+#if defined(__WIN32__)
+extern "C" CDECL rust_str *
+rust_dirent_filename(rust_task *task, void* ent) {
+    return NULL;
 }
 #else
 extern "C" CDECL rust_str *
diff --git a/src/rt/rust_run_program.cpp b/src/rt/rust_run_program.cpp
index 5919f68e844..7b73586e9c8 100644
--- a/src/rt/rust_run_program.cpp
+++ b/src/rt/rust_run_program.cpp
@@ -76,6 +76,12 @@ rust_run_program(rust_task* task, char* argv[],
     exit(1);
 }
 
+extern "C" CDECL int
+rust_process_wait(void* task, int proc) {
+    // FIXME: stub; exists to placate linker.
+    return 0;
+}
+
 #else
 #error "Platform not supported."
 #endif
diff --git a/src/rt/rustrt.def.in b/src/rt/rustrt.def.in
index df9e26aff9e..be51770a9d2 100644
--- a/src/rt/rustrt.def.in
+++ b/src/rt/rustrt.def.in
@@ -17,6 +17,8 @@ rust_dirent_filename
 rust_file_is_dir
 rust_get_stdin
 rust_get_stdout
+rust_list_files
+rust_process_wait
 rust_run_program
 rust_start
 size_of