diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 542e62c..be62411 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -233,8 +233,10 @@ jobs:
             target: thumbv7neon-unknown-linux-gnueabihf
           - os: macos-latest
             target: x86_64-apple-ios
-          - os: ubuntu-latest
-            target: x86_64-fortanix-unknown-sgx
+          # `gethostname` function is not available
+          # - os: ubuntu-latest
+          #   target: x86_64-fortanix-unknown-sgx
+          #
           # `rust-std` seems to be not available?
           # - os: ubuntu-latest
           #   target: x86_64-unknown-fuchsia
@@ -244,8 +246,6 @@ jobs:
             target: x86_64-pc-solaris
           - os: ubuntu-latest
             target: x86_64-unknown-linux-gnux32
-          - os: ubuntu-latest
-            target: x86_64-unknown-redox
     steps:
       - uses: actions/checkout@v1
       - name: Install Rust toolchain
@@ -260,6 +260,36 @@ jobs:
         run: |
           cross build --all-features --target=${{ matrix.target }}
 
+  tier2_without_host_tools_default_features:
+    # Matches Rust "Tier 2 with host tools" platform support
+    # For as much as possible, but where `cross` is needed for cross-compilation
+    #
+    # The only difference from the `tier2_without_host_tools` group is that
+    # no optional crate features are enabled (e.g. Redox has `gethostname(2)`, but not the `sethostname(2)`)
+    #
+    # See https://doc.rust-lang.org/nightly/rustc/platform-support.html#tier-2-with-host-tools
+    name: Tier 2 (without Host Tools)
+    needs: tier1
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        include:
+          - os: ubuntu-latest
+            target: x86_64-unknown-redox
+    steps:
+      - uses: actions/checkout@v1
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: 1.67.0
+          targets: ${{ matrix.target }}
+      - uses: taiki-e/install-action@v2
+        with:
+          tool: cross
+      - name: Run build (default features)
+        run: |
+          cross build --target=${{ matrix.target }}
+
 # TODO: Tier 3
 # - x86_64-unknown-dragonfly
 # And other targets that have `std` compiled
diff --git a/Cargo.toml b/Cargo.toml
index b5fcb9b..6ed3653 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,7 +26,7 @@ cfg-if = "^1.0"
 libc = "^0.2"
 
 [target.'cfg(target_os = "windows")'.dependencies]
-windows = { version = "^0.51", features = ["Win32_Foundation", "Win32_System_SystemInformation"] }
+windows = { version = "^0.52", features = ["Win32_Foundation", "Win32_System_SystemInformation"] }
 
 [dev-dependencies]
 version-sync = "0.9"
diff --git a/src/nix.rs b/src/nix.rs
index 7dd9980..bfb212a 100644
--- a/src/nix.rs
+++ b/src/nix.rs
@@ -49,7 +49,8 @@ pub fn set(hostname: &OsStr) -> io::Result<()> {
         target_os = "freebsd",
         target_os = "ios",
         target_os = "macos",
-        target_os = "solaris"
+        target_os = "solaris",
+        target_os = "illumos"
     )))]
     #[allow(non_camel_case_types)]
     type hostname_len_t = libc::size_t;
@@ -59,7 +60,8 @@ pub fn set(hostname: &OsStr) -> io::Result<()> {
         target_os = "freebsd",
         target_os = "ios",
         target_os = "macos",
-        target_os = "solaris"
+        target_os = "solaris",
+        target_os = "illumos"
     ))]
     #[allow(non_camel_case_types)]
     type hostname_len_t = libc::c_int;