diff --git a/files/rustc/illumos.toml b/files/rustc/illumos.toml
new file mode 100644
index 0000000..0faec26
--- /dev/null
+++ b/files/rustc/illumos.toml
@@ -0,0 +1,5 @@
+[[files]]
+name = "rustc/illumos-sysroot-i386-20210501-e0b4275f34-v0.tar.gz"
+source = "https://github.com/illumos/sysroot/releases/download/20210501-e0b4275f34-v0/illumos-sysroot-i386-20210501-e0b4275f34-v0.tar.gz"
+sha256 = "28d8f4f6d84331ff1e99ac3d68b917cf8174897a5c00171c5e493253eb1587f6"
+license = "CDDL-1.0"