diff --git a/rules.mk b/rules.desired.mk
index 4ca7b4d..e2f63f2 100644
--- a/rules.mk
+++ b/rules.desired.mk
@@ -10,8 +10,36 @@ MODULE_RUST_CRATE_TYPES := rlib
 MODULE_SRCS := $(LOCAL_DIR)/src/lib.rs
 MODULE_ADD_IMPLICIT_DEPS := false
 MODULE_RUST_EDITION := 2015
+MODULE_RUSTFLAGS += \
+	--cfg 'freebsd11' \
+	--cfg 'libc_align' \
+	--cfg 'libc_cfg_target_vendor' \
+	--cfg 'libc_const_extern_fn' \
+	--cfg 'libc_const_size_of' \
+	--cfg 'libc_core_cvoid' \
+	--cfg 'libc_int128' \
+	--cfg 'libc_long_array' \
+	--cfg 'libc_non_exhaustive' \
+	--cfg 'libc_packedN' \
+	--cfg 'libc_priv_mod_use' \
+	--cfg 'libc_ptr_addr_of' \
+	--cfg 'libc_underscore_const_names' \
+	--cfg 'libc_union' \
+	-A unknown-lints \
+
 MODULE_LIBRARY_DEPS := \
 	trusty/user/base/lib/libcompiler_builtins-rust \
 	trusty/user/base/lib/libcore-rust
 
+ifeq ($(call TOBOOL,$(TRUSTY_USERSPACE)),true)
+
+MODULE_RUSTFLAGS += \
+	--cfg 'feature="trusty_sys"' \
+
+MODULE_LIBRARY_DEPS += \
+	trusty/user/base/lib/libc-trusty \
+	trusty/user/base/lib/trusty-sys \
+
+endif
+
 include make/library.mk