diff --git a/.github/workflows/_build.yml b/.github/workflows/_build.yml
index 82d2f6241..42f9480cd 100644
--- a/.github/workflows/_build.yml
+++ b/.github/workflows/_build.yml
@@ -334,3 +334,83 @@ jobs:
         with:
           name: binaries-linux-${{ matrix.arch }}-portable
           path: "*.tar.gz"
+
+  build-freebsd:
+    name: build-unix (freebsd-${{ matrix.release }}, freebsd, ${{ matrix.arch }}, clang, clang++)
+    strategy:
+      fail-fast: false
+      matrix:
+        release: ['15.1', '14.4']
+        arch: ['x86_64']
+        # arch: ['x86_64', 'aarch64']
+        # aarch64 disabled for now: lightningcss (a native Rust dependency of
+        # the Vite/CSS build pipeline) publishes no prebuilt binary for
+        # freebsd-arm64, so `npm run build` fails with "Cannot find module
+        # '../lightningcss.freebsd-arm64.node'" — a real gap in that
+        # package's platform coverage, not something fixable on our side
+        # without vendoring a Rust build of it. Re-enable once lightningcss
+        # ships that target, or once the frontend build is moved to run
+        # natively on a Linux host instead of inside the FreeBSD VM.
+        include:
+          - arch: x86_64
+            artifact_arch: amd64
+            sync: rsync
+          # - arch: aarch64
+          #  artifact_arch: arm64-aarch64
+          #  sync: scp
+    # Must use ubuntu-latest (x86_64 host). Running QEMU guest emulation on arm runners (ubuntu-*-arm)
+    # causes severe performance degradation leading to 3+ hour timeouts.
+    runs-on: ubuntu-latest
+    timeout-minutes: 240
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+
+      - name: Build FreeBSD ${{ matrix.release }} (${{ matrix.arch }}) binaries inside VM
+        # https://github.com/vmactions/freebsd-vm
+        uses: vmactions/freebsd-vm@83b151f58c6047089f4c80eb5ba2039d158ce093 # v1
+        with:
+          release: ${{ matrix.release }}
+          arch: ${{ matrix.arch }}
+          # Sync options: rsync, sshfs, nfs, scp
+          sync: ${{ matrix.sync }}
+          usesh: true
+          mem: 6144
+          cpu: 4
+          prepare: |
+            pkg update -f
+            pkg install -y gmake sqlite3 pkgconf node22 npm-node22 bash
+            which python3 >/dev/null 2>&1 || ln -sf $(which python3.15 python3.14 python3.13 python3.12 python3.11 python3.10 2>/dev/null | head -n 1) /usr/local/bin/python3
+          run: |
+            # Build standard binary (canonical scripts/build.sh pattern)
+            if [ -n "${{ inputs.version }}" ]; then
+              scripts/build.sh --version "${{ inputs.version }}" CC=clang CXX=clang++
+            else
+              scripts/build.sh CC=clang CXX=clang++
+            fi
+            scripts/package-release.sh freebsd ${{ matrix.arch }}-${{ matrix.release }}
+
+            # Build UI binary
+            if [ -n "${{ inputs.version }}" ]; then
+              scripts/build.sh --version "${{ inputs.version }}" --with-ui CC=clang CXX=clang++
+            else
+              scripts/build.sh --with-ui CC=clang CXX=clang++
+            fi
+            scripts/package-release.sh freebsd ${{ matrix.arch }}-${{ matrix.release }} --variant ui
+
+      - name: Attest standard binary provenance
+        if: ${{ inputs.attest }}
+        uses: actions/attest-build-provenance@0f67c3f4856b2e3261c31976d6725780e5e4c373 # v4.1.1
+        with:
+          subject-path: codebase-memory-mcp-freebsd-${{ matrix.artifact_arch }}-${{ matrix.release }}.tar.gz
+
+      - name: Attest UI binary provenance
+        if: ${{ inputs.attest }}
+        uses: actions/attest-build-provenance@0f67c3f4856b2e3261c31976d6725780e5e4c373 # v4.1.1
+        with:
+          subject-path: codebase-memory-mcp-ui-freebsd-${{ matrix.artifact_arch }}-${{ matrix.release }}.tar.gz
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        with:
+          name: binaries-freebsd-${{ matrix.artifact_arch }}-${{ matrix.release }}
+          path: "*.tar.gz"
+
diff --git a/scripts/build.sh b/scripts/build.sh
index 575477a94..7fd7426b5 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -149,10 +149,10 @@ cbm_remove_build_dir "$ROOT" "$BUILD_DIR"
 
 # Step 2: Build (Makefile applies $ARCHFLAGS for the target arch on macOS)
 if $WITH_UI; then
-    make -j"$NPROC" -f Makefile.cbm cbm-with-ui \
+    $MAKE -j"$NPROC" -f Makefile.cbm cbm-with-ui \
         CFLAGS_EXTRA="$CFLAGS_EXTRA" "${EXTRA_MAKE_ARGS[@]+"${EXTRA_MAKE_ARGS[@]}"}"
 else
-    make -j"$NPROC" -f Makefile.cbm cbm \
+    $MAKE -j"$NPROC" -f Makefile.cbm cbm \
         CFLAGS_EXTRA="$CFLAGS_EXTRA" "${EXTRA_MAKE_ARGS[@]+"${EXTRA_MAKE_ARGS[@]}"}"
 fi
 
diff --git a/scripts/env.sh b/scripts/env.sh
index e23affe4c..0d0e7b6f6 100755
--- a/scripts/env.sh
+++ b/scripts/env.sh
@@ -7,7 +7,7 @@
 #   ARCH        — target architecture (arm64 / x86_64)
 #   ARCHFLAGS   — "-arch <arch>" on macOS (target slice for clang/ld), empty elsewhere
 #   NPROC       — number of CPU cores
-#   OS          — darwin / linux / windows
+#   OS          — darwin / linux / windows / freebsd
 
 set -euo pipefail
 
@@ -16,10 +16,21 @@ OS="$(uname -s | tr '[:upper:]' '[:lower:]')"
 case "$OS" in
     darwin)  OS="darwin" ;;
     linux)   OS="linux" ;;
+    freebsd*) OS="freebsd" ;;
     mingw*|msys*|cygwin*) OS="windows" ;;
     *)       OS="unknown" ;;
 esac
 
+# ── Set platform-appropriate make ──────────────────────────────
+# FreeBSD ships BSD make as the default 'make'; GNU Makefile syntax in
+# Makefile.cbm requires gmake. All other platforms use 'make'.
+if [[ "$OS" == "freebsd" ]]; then
+    MAKE=gmake
+else
+    MAKE=make
+fi
+export MAKE
+
 # ── Detect / override architecture ─────────────────────────────
 # Default: native HARDWARE architecture (not Rosetta-translated).
 # On macOS under Rosetta, uname -m returns x86_64 even on Apple Silicon.
diff --git a/scripts/package-release.sh b/scripts/package-release.sh
index 72b090704..868fbfc54 100755
--- a/scripts/package-release.sh
+++ b/scripts/package-release.sh
@@ -23,7 +23,7 @@ Usage: scripts/package-release.sh <goos> <goarch> [--variant standard|ui]
 The canonical release-archive step: identical in the release build and the
 local artifact-flow smoke lane.
 
-  goos       linux | darwin | windows
+  goos       linux | darwin | windows | freebsd
   goarch     arch label used verbatim in the archive name (amd64, arm64,
              arm64-portable, ...)
   --variant  standard (default) | ui — selects the archive NAME prefix; the
@@ -77,8 +77,8 @@ for arg in "$@"; do
 done
 [ -n "$GOOS" ] && [ -n "$GOARCH" ] || { usage >&2; exit 2; }
 case "$GOOS" in
-linux | darwin | windows) ;;
-*) echo "package-release: goos must be linux, darwin or windows." >&2; exit 2 ;;
+linux | darwin | windows | freebsd) ;;
+*) echo "package-release: goos must be linux, darwin, windows or freebsd." >&2; exit 2 ;;
 esac
 case "$VARIANT" in
 standard) SUFFIX="" ;;