diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 09ecb68..2b68240 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,6 +13,40 @@ env:
   RUST_TOOLCHAIN: "1.92"
 
 jobs:
+  linux-x64:
+    name: Linux x64
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+
+      # Free up disk space on Ubuntu runners
+      - name: Free Disk Space
+        run: |
+          sudo rm -rf /usr/share/dotnet
+          sudo rm -rf /usr/local/lib/android
+          sudo rm -rf /opt/ghc
+          sudo rm -rf /opt/hostedtoolcache/CodeQL
+          sudo docker image prune --all --force
+          df -h
+
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ env.RUST_TOOLCHAIN }}
+          profile: minimal
+          override: true
+
+      - uses: swatinem/rust-cache@v2
+        with:
+          shared-key: kingfisher-${{ runner.os }}-${{ runner.arch }}
+          cache-on-failure: true
+
+      - name: Build (Makefile linux-x64)
+        run: make ubuntu-x64
+      - name: Run tests
+        run: make tests
+        env:
+          CARGO_BUILD_JOBS: 1
+
   linux-arm64:
     name: Linux arm64
     runs-on: ubuntu-24.04-arm
diff --git a/Makefile b/Makefile
index 748518a..3067d5c 100644
--- a/Makefile
+++ b/Makefile
@@ -2,6 +2,7 @@ SHELL := /usr/bin/env bash
 .SHELLFLAGS := -eu -o pipefail -c
 
 PROJECT_NAME := kingfisher
+ZIG_VERSION ?= 0.15.1
 
 # Determine OS and whether to use gtar on darwin
 OS := $(shell uname)
@@ -74,7 +75,7 @@ create-dockerignore:
 .PHONY: setup-zig
 setup-zig:
 	@command -v zig >/dev/null 2>&1 || { \
-	  echo "⬇️  Installing Zig 0.14.0 …"; \
+	  echo "⬇️  Installing Zig $(ZIG_VERSION) …"; \
 	  if $(SUDO_CMD) apt-get update -qq && \
 	     $(SUDO_CMD) apt-get install -y --no-install-recommends zig 2>/dev/null ; then \
 	    echo "✓ Zig installed via apt"; \
@@ -82,13 +83,27 @@ setup-zig:
 	    echo "⚠️  Package 'zig' not in apt repos – falling back to manual install"; \
 	    arch=$$(uname -m); \
 	    case "$$arch" in \
-	      x86_64)   pkg=zig-linux-x86_64-0.14.0 ;; \
-	      aarch64|arm64) pkg=zig-linux-aarch64-0.14.0 ;; \
+	      x86_64)   arch_tag=x86_64 ;; \
+	      aarch64|arm64) arch_tag=aarch64 ;; \
 	      *) echo "Unsupported architecture: $$arch"; exit 1 ;; \
 	    esac; \
-	    curl -L -o /tmp/zig.tar.xz https://ziglang.org/download/0.14.0/$${pkg}.tar.xz; \
+	    url_new="https://ziglang.org/download/$(ZIG_VERSION)/zig-$${arch_tag}-linux-$(ZIG_VERSION).tar.xz"; \
+	    url_old="https://ziglang.org/download/$(ZIG_VERSION)/zig-linux-$${arch_tag}-$(ZIG_VERSION).tar.xz"; \
+	    if ! curl -fL --retry 3 --retry-delay 2 -o /tmp/zig.tar.xz "$$url_new"; then \
+	      echo "↩️  New Zig filename pattern failed, trying legacy pattern"; \
+	      curl -fL --retry 3 --retry-delay 2 -o /tmp/zig.tar.xz "$$url_old"; \
+	    fi; \
+	    xz -t /tmp/zig.tar.xz >/dev/null 2>&1 || { \
+	      echo "Downloaded Zig archive is invalid (not a tar.xz)."; \
+	      ls -lh /tmp/zig.tar.xz || true; \
+	      exit 1; \
+	    }; \
 	    tar -C /tmp -xf /tmp/zig.tar.xz; \
-	    $(SUDO_CMD) mv /tmp/$${pkg} /opt/zig; \
+	    tar -tf /tmp/zig.tar.xz > /tmp/zig-contents.txt; \
+	    IFS=/ read -r zig_dir _ < /tmp/zig-contents.txt; \
+	    [ -n "$$zig_dir" ] || { echo "Could not determine Zig extract directory"; exit 1; }; \
+	    $(SUDO_CMD) rm -rf /opt/zig; \
+	    $(SUDO_CMD) mv "/tmp/$${zig_dir}" /opt/zig; \
 	    $(SUDO_CMD) ln -sf /opt/zig/zig /usr/local/bin/zig; \
 	    echo "✓ Zig installed to /usr/local/bin/zig"; \
 	  fi; \
diff --git a/vendor/vectorscan-rs/vectorscan-rs-sys/build.rs b/vendor/vectorscan-rs/vectorscan-rs-sys/build.rs
index 9708caf..24efe33 100644
--- a/vendor/vectorscan-rs/vectorscan-rs-sys/build.rs
+++ b/vendor/vectorscan-rs/vectorscan-rs-sys/build.rs
@@ -262,6 +262,16 @@ fn main() {
                     .define("BUILD_SVE2_BITPERM", "OFF");
             }
 
+            // Under cargo-zigbuild for x86_64-unknown-linux-musl, Vectorscan's
+            // configure-time probes can incorrectly miss posix_memalign/unistd.
+            // Scope this workaround to musl targets only to avoid impacting
+            // unrelated native dependencies.
+            let target = env("TARGET");
+            if target.ends_with("-musl") {
+                cfg.define("HAVE_UNISTD_H", "1")
+                    .define("HAVE_POSIX_MEMALIGN", "1");
+            }
+
             let dst = cfg.build();
             println!("cargo:rustc-link-lib=static=hs");
             println!("cargo:rustc-link-search={}", dst.join("lib").display());