diff --git a/.cargo/config.toml b/.cargo/config.toml
new file mode 100644
index 0000000..d5db07a
--- /dev/null
+++ b/.cargo/config.toml
@@ -0,0 +1,8 @@
+[target.x86_64-unknown-linux-gnu]
+linker = "clang"
+
+[target.x86_64-unknown-linux-musl]
+linker = "clang"
+
+[target.x86_64-unknown-freebsd]
+linker = "x86_64-unknown-freebsd-clang"
diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..a5dbbcb
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use flake .
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..2d5df85
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/target
+.direnv
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..0170448
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "sparse-beacon"
+version = "0.7.0"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..35853d1
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,13 @@
+[workspace]
+members = [
+    "sparse-beacon"
+]
+resolver = "2"
+package.version = "2.0.0"
+
+[profile.release]
+strip = true
+opt-level = "z"
+lto = true
+codegen-units = 1
+panic = "abort"
diff --git a/flake.lock b/flake.lock
index 53ac97b..6dd8246 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,11 +2,11 @@
   "nodes": {
     "crane": {
       "locked": {
-        "lastModified": 1736898272,
-        "narHash": "sha256-D10wlrU/HCpSRcb3a7yk+bU3ggpMD1kGbseKtO+7teo=",
+        "lastModified": 1737250794,
+        "narHash": "sha256-bdIPhvsAKyYQzqAIeay4kOxTHGwLGkhM+IlBIsmMYFI=",
         "owner": "ipetkov",
         "repo": "crane",
-        "rev": "6a589f034202a7c6e10bce6c5d1d392d7bc0f340",
+        "rev": "c5b7075f4a6d523fe8204618aa9754e56478c0e0",
         "type": "github"
       },
       "original": {
@@ -15,27 +15,6 @@
         "type": "github"
       }
     },
-    "fenix": {
-      "inputs": {
-        "nixpkgs": [
-          "nixpkgs"
-        ],
-        "rust-analyzer-src": "rust-analyzer-src"
-      },
-      "locked": {
-        "lastModified": 1736836313,
-        "narHash": "sha256-zdZ7/T6yG0/hzoVOiNpDiR/sW3zR6oSMrfIFJK2BrrE=",
-        "owner": "nix-community",
-        "repo": "fenix",
-        "rev": "056c9393c821a4df356df6ce7f14c722dc8717ec",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "repo": "fenix",
-        "type": "github"
-      }
-    },
     "flake-utils": {
       "inputs": {
         "systems": "systems"
@@ -54,7 +33,19 @@
         "type": "github"
       }
     },
-    "libnl": {
+    "freebsd-libs-packed": {
+      "flake": false,
+      "locked": {
+        "narHash": "sha256-l9YQPyra0F4guqiI4rW5XsZxGP1Usy//nglUVFlqY1c=",
+        "type": "file",
+        "url": "https://download.freebsd.org/releases/amd64/14.1-RELEASE/base.txz"
+      },
+      "original": {
+        "type": "file",
+        "url": "https://download.freebsd.org/releases/amd64/14.1-RELEASE/base.txz"
+      }
+    },
+    "libnl-src": {
       "flake": false,
       "locked": {
         "lastModified": 1736681776,
@@ -73,11 +64,11 @@
     "libpcap-src": {
       "flake": false,
       "locked": {
-        "lastModified": 1736964815,
-        "narHash": "sha256-qXgILw6Br5kanQzTmPC5P0JBZFyO7jSdKKyl4UdtD4Q=",
+        "lastModified": 1737231768,
+        "narHash": "sha256-cZpHFjy0cqLeP4TJR80aAMi0V4qzPcEmwU8ouhxZ0sM=",
         "ref": "refs/heads/master",
-        "rev": "515022131fa902b2641bcf3bf40f323b0dd726f7",
-        "revCount": 6396,
+        "rev": "1fd4281671fb78533bfb3cfac31db78a4015cdcd",
+        "revCount": 6400,
         "type": "git",
         "url": "https://github.com/the-tcpdump-group/libpcap"
       },
@@ -88,11 +79,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1736867362,
-        "narHash": "sha256-i/UJ5I7HoqmFMwZEH6vAvBxOrjjOJNU739lnZnhUln8=",
+        "lastModified": 1737165118,
+        "narHash": "sha256-s40Kk/OulP3J/1JvC3VT16U4r/Xw6Qdi7SRw3LYkPWs=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "9c6b49aeac36e2ed73a8c472f1546f6d9cf1addc",
+        "rev": "6a3ae7a5a12fb8cac2d59d7df7cbd95f9b2f0566",
         "type": "github"
       },
       "original": {
@@ -105,30 +96,14 @@
     "root": {
       "inputs": {
         "crane": "crane",
-        "fenix": "fenix",
         "flake-utils": "flake-utils",
-        "libnl": "libnl",
+        "freebsd-libs-packed": "freebsd-libs-packed",
+        "libnl-src": "libnl-src",
         "libpcap-src": "libpcap-src",
         "nixpkgs": "nixpkgs",
         "rust-overlay": "rust-overlay",
-        "winpcap": "winpcap"
-      }
-    },
-    "rust-analyzer-src": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1736690231,
-        "narHash": "sha256-g9gyxX+F6CrkT5gRIMKPnCPom0o9ZDzYnzzeNF86D6Q=",
-        "owner": "rust-lang",
-        "repo": "rust-analyzer",
-        "rev": "8364ef299790cb6ec22b9e09e873c97dbe9f2cb5",
-        "type": "github"
-      },
-      "original": {
-        "owner": "rust-lang",
-        "ref": "nightly",
-        "repo": "rust-analyzer",
-        "type": "github"
+        "winpcap-installer": "winpcap-installer",
+        "winpcap-libs": "winpcap-libs"
       }
     },
     "rust-overlay": {
@@ -138,11 +113,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1736907983,
-        "narHash": "sha256-fw55wVwpJW36Md2HZBKuxX3YHGeqsGsspPLtCMVr1Y8=",
+        "lastModified": 1737253755,
+        "narHash": "sha256-T1FIl8yuQ0cJx2DBMvWH73O/igJGaumNNyZkea2m3a0=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "eaa365c911441e07e387ff6acc596619fc50b156",
+        "rev": "9e4b97a04063ff39a37b63e8fb31cc2b4adf9227",
         "type": "github"
       },
       "original": {
@@ -166,7 +141,19 @@
         "type": "github"
       }
     },
-    "winpcap": {
+    "winpcap-installer": {
+      "flake": false,
+      "locked": {
+        "narHash": "sha256-F3nzqZKR79zyV8INL3k1XndwOfWVJHYiBTI14e//ljc=",
+        "type": "file",
+        "url": "https://www.winpcap.org/install/bin/WinPcap_4_1_3.exe"
+      },
+      "original": {
+        "type": "file",
+        "url": "https://www.winpcap.org/install/bin/WinPcap_4_1_3.exe"
+      }
+    },
+    "winpcap-libs": {
       "flake": false,
       "locked": {
         "lastModified": 1277475020,
diff --git a/flake.nix b/flake.nix
index 17c4d83..0513595 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,78 +3,101 @@
 
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-24.11";
+
     rust-overlay = {
       url = "github:oxalica/rust-overlay";
       inputs.nixpkgs.follows = "nixpkgs";
     };
     crane.url = "github:ipetkov/crane";
     flake-utils.url = "github:numtide/flake-utils";
-    fenix = {
-      url = "github:nix-community/fenix";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
 
     libpcap-src = {
       url = "git+https://github.com/the-tcpdump-group/libpcap";
       flake = false;
     };
-    libnl = {
+    libnl-src = {
       url = "git+https://github.com/thom311/libnl";
       flake = false;
     };
-    winpcap = {
+    winpcap-libs = {
       url = "https://www.winpcap.org/install/bin/WpdPack_4_1_2.zip";
       flake = false;
     };
-
-    #freebsd = {
-    #  url =
-    #    "https://download.freebsd.org/releases/ISO-IMAGES/14.1/FreeBSD-14.1-RELEASE-amd64-dvd1.iso";
-    #  flake = false;
-    #};
+    winpcap-installer = {
+      url = "https://www.winpcap.org/install/bin/WinPcap_4_1_3.exe";
+      flake = false;
+    };
+    freebsd-libs-packed = {
+      url = "https://download.freebsd.org/releases/amd64/14.1-RELEASE/base.txz";
+      flake = false;
+    };
+    # command for later:
+    # echo '000007: 09' | xxd -r - target/x86_64-unknown-freebsd/debug/sparse-beacon
   };
 
-  outputs = { self, nixpkgs, flake-utils, crane, fenix, rust-overlay
-    , libpcap-src, libnl, winpcap }:
-    flake-utils.lib.eachDefaultSystem (system:
+  outputs = { self, nixpkgs, flake-utils, crane, rust-overlay, libpcap-src
+    , libnl-src, winpcap-libs, winpcap-installer, freebsd-libs-packed }:
+    flake-utils.lib.eachSystem [ "x86_64-linux" ] (system:
       let
         pkgs = import nixpkgs {
           inherit system;
-          overlays = [ (import rust-overlay) fenix.overlays.default ];
-          config.allowUnfree = true;
+          overlays = [ (import rust-overlay) ];
         };
 
-        linuxBuildTools = with pkgs; [
-          autoconf
-          automake
-          bison
-          cmake
-          flex
-          libtool
-          libpcap
-          musl
-          pkg-config
-        ];
+        system-libs = import ./system-libs.nix {
+          inherit pkgs libpcap-src winpcap-installer freebsd-libs-packed;
+        };
+        inherit (system-libs)
+          bsd-toolchain winpcap-drivers freebsd-libs libnl libpcap-linux
+          libpcap-freebsd;
 
-        windowsBuildTools = linuxBuildTools ++ (with pkgs; [
+        buildTools = with pkgs; [
+          mold
+          lld
+          zig
+          clang
+          glibc
+
+          pkgsCross.x86_64-freebsd.buildPackages.clang
           pkgsCross.mingwW64.stdenv.cc
           pkgsCross.mingwW64.windows.pthreads
-        ]);
+        ];
 
-        toolchain =
-          pkgs.pkgsMusl.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
+        devShellTools = with pkgs; [ rust-analyzer ];
 
-        craneLib = (crane.mkLib pkgs).overrideToolchain toolchain;
+        craneLib = (crane.mkLib pkgs).overrideToolchain (p:
+          p.rust-bin.stable.latest.default.override {
+            targets = [
+              "x86_64-unknown-linux-gnu"
+              "x86_64-unknown-linux-musl"
+              "x86_64-pc-windows-gnu"
+              "x86_64-unknown-freebsd"
+            ];
+          });
+
+        patch-elf = header: drv: path:
+          pkgs.stdenv.mkDerivation {
+            name = "elf-patch-${header}";
+
+            buildInputs = with pkgs; [ vim ];
+          };
+        patch-freebsd-elf = patch-elf 9;
       in {
-        devShells.default = craneLib.devShell {
-          name = "sparse";
+        devShells = {
+          default = craneLib.devShell {
+            name = "sparse-default";
 
-          buildInputs = windowsBuildTools
-            ++ (with pkgs; [ rust-analyzer packer ]);
+            packages = buildTools ++ devShellTools;
 
-          SPARSE_BUILD_WINPCAP = "${winpcap}/Lib";
-          SPARSE_BUILD_LIBPCAP = "${libpcap-src}";
-          SPARSE_BUILD_LIBNL = "${libnl}";
+            SPARSE_BUILD_WINPCAP_LIBS = "${winpcap-libs}/Lib";
+            SPARSE_BUILD_WINPCAP_DRIVERS = "${winpcap-drivers}/npf.sys";
+            SPARSE_BUILD_LIBPCAP = libpcap-src;
+            SPARSE_BUILD_LIBNL = libnl-src;
+
+            FREEBSD_LIBS = freebsd-libs;
+
+            RUSTFLAGS = "-Ctarget-feature=+crt-static";
+          };
         };
       });
 }
diff --git a/sparse-beacon/Cargo.toml b/sparse-beacon/Cargo.toml
new file mode 100644
index 0000000..82cefbb
--- /dev/null
+++ b/sparse-beacon/Cargo.toml
@@ -0,0 +1,4 @@
+[package]
+name = "sparse-beacon"
+version = "0.7.0"
+edition = "2021"
diff --git a/sparse-beacon/build.rs b/sparse-beacon/build.rs
new file mode 100644
index 0000000..cc35c3d
--- /dev/null
+++ b/sparse-beacon/build.rs
@@ -0,0 +1,8 @@
+fn main() {
+    if std::env::var("CARGO_CFG_TARGET_OS").unwrap() == "freebsd" {
+        let freebsd_libs = std::env::var("FREEBSD_LIBS").unwrap();
+        println!("cargo:rustc-link-arg=--sysroot={freebsd_libs}");
+        println!("cargo:rustc-link-arg=-L{freebsd_libs}/lib");
+        println!("cargo:rustc-link-arg=-L{freebsd_libs}/usr/lib");
+    }
+}
diff --git a/sparse-beacon/src/main.rs b/sparse-beacon/src/main.rs
new file mode 100644
index 0000000..ac6bb53
--- /dev/null
+++ b/sparse-beacon/src/main.rs
@@ -0,0 +1,3 @@
+fn main() {
+    println!("hi there");
+}
diff --git a/system-libs.nix b/system-libs.nix
new file mode 100644
index 0000000..1ebab9a
--- /dev/null
+++ b/system-libs.nix
@@ -0,0 +1,125 @@
+{ pkgs, libpcap-src, winpcap-installer, freebsd-libs-packed }:
+let
+  freebsd-libs = pkgs.stdenv.mkDerivation {
+    name = "freebsd-libs";
+
+    buildInputs = with pkgs; [ gnutar ];
+
+    unpackPhase = ''
+      mkdir -p $out
+      tar xvJpf ${freebsd-libs-packed} -C $out ./usr/lib
+      tar xvJpf ${freebsd-libs-packed} -C $out ./usr/include
+    '';
+  };
+
+  bsd-toolchain = with pkgs.pkgsCross.x86_64-freebsd.buildPackages;
+    pkgs.writeText "bsd-toolchain.cmake" ''
+      set(CMAKE_SYSTEM_NAME FreeBSD)
+
+      set(CMAKE_C_COMPILER   ${clang}/bin/x86_64-unknown-freebsd-clang)
+      set(CMAKE_CXX_COMPILER ${clang}/bin/x86_64-unknown-freebsd-clang++)
+
+      set(CMAKE_FIND_ROOT_PATH ${freebsd-libs})
+
+      set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+      set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+      set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+    '';
+in {
+  inherit freebsd-libs;
+
+  winpcap-drivers = pkgs.stdenv.mkDerivation {
+    name = "winpcap-drivers";
+
+    buildInputs = with pkgs; [ p7zip ];
+
+    # extract only the 64 bit drivers
+    unpackPhase = ''
+      mkdir -p $out
+      printf 'Y\nN\n' | 7z e "${winpcap-installer}" '$SYSDIR/drivers/npf.sys'
+      mv npf.sys $out/npf.sys
+    '';
+  };
+
+  libnl = pkgs.stdenv.mkDerivation {
+    name = "libnl-static";
+
+    buildInputs = with pkgs; [ autoconf automake libtool ];
+
+  };
+
+  libpcap-linux = pkgs.stdenv.mkDerivation {
+    name = "libpcap-static-linux";
+
+    buildInputs = with pkgs; [ automake bison cmake flex ];
+
+    src = libpcap-src;
+
+    configurePhase = ''
+      cmake \
+            -DCMAKE_BUILD_TYPE=MinSizeRel \
+            -DBUILD_SHARED_LIBS=OFF \
+            -DDISABLE_BLUETOOTH=ON \
+            -DDISABLE_DAG=ON \
+            -DDISABLE_DBUS=ON \
+            -DDISABLE_DPDK=ON \
+            -DDISABLE_NETMAP=ON \
+            -DDISABLE_RDMA=ON \
+            -DDISABLE_LINUX_USBMON=ON \
+            -DDISABLE_SNF=ON \
+            -DPCAP_TYPE=linux \
+            .
+    '';
+
+    buildPhase = ''
+      cmake --build . --target pcap_static
+    '';
+
+    installPhase = ''
+      mkdir -p $out/lib
+
+      cp libpcap.a $out/lib
+    '';
+  };
+
+  libpcap-freebsd = pkgs.stdenv.mkDerivation {
+    name = "libpcap-static-freebsd";
+
+    nativeBuildInputs = with pkgs.pkgsCross.x86_64-freebsd.buildPackages; [
+      clang
+      lld
+      automake
+      bison
+      cmake
+      flex
+    ];
+
+    src = libpcap-src;
+
+    configurePhase = ''
+      cmake \
+            -DCMAKE_TOOLCHAIN_FILE=${bsd-toolchain} \
+            -DCMAKE_BUILD_TYPE=MinSizeRel \
+            -DBUILD_SHARED_LIBS=OFF \
+            -DDISABLE_BLUETOOTH=ON \
+            -DDISABLE_DAG=ON \
+            -DDISABLE_DBUS=ON \
+            -DDISABLE_DPDK=ON \
+            -DDISABLE_NETMAP=ON \
+            -DDISABLE_RDMA=ON \
+            -DDISABLE_SNF=ON \
+            -DPCAP_TYPE=bpf \
+            .
+    '';
+
+    buildPhase = ''
+      cmake --build . --target pcap_static
+    '';
+
+    installPhase = ''
+      mkdir -p $out/lib
+
+      cp libpcap.a $out/lib
+    '';
+  };
+}
diff --git a/toolchain.toml b/toolchain.toml
deleted file mode 100644
index 090ed9d..0000000
--- a/toolchain.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[toolchain]
-channel = "stable"
-components = []
-targets = [ "x86_64-pc-windows-gnu", "x86_64-unknown-linux-musl", "x86_64-unknown-freebsd", "aarch64-apple-darwin" ]
-profile = "minimal"