diff --git a/packages.nix b/packages.nix
index 24cf51f..348d98c 100644
--- a/packages.nix
+++ b/packages.nix
@@ -11,9 +11,12 @@ let
     {
       rustPlatform,
       pkgs,
+      buildType ? "release",
+      buildNoDefaultFeatures ? false,
+      cargoBuildFlags ? [ ],
     }:
     rustPlatform.buildRustPackage (finalAttrs: {
-      inherit version;
+      inherit version buildType cargoBuildFlags;
 
       pname = "servicepoint-binding-c";
       src = lib.filter {
@@ -57,9 +60,14 @@ let
       name,
       servicepointBinding,
       pkgs,
+      EXTRA_CFLAGS ? "",
+      static ? false,
     }:
+    let
+      staticPkgConfigParam = if static then "--static" else "";
+    in
     pkgs.gccStdenv.mkDerivation {
-      inherit version;
+      inherit version EXTRA_CFLAGS;
       pname = "servicepoint-c-example-${name}";
       nativeBuildInputs = [ pkgs.pkg-config ];
       buildInputs = [
@@ -71,19 +79,12 @@ let
         set -e
         set -x
         mkdir -p $out/bin
-        $CC ${name}.c $CFLAGS $EXTRA_CFLAGS $(pkg-config --libs --cflags servicepoint) $(pkg-config --libs --cflags liblzma) -o $out/bin/${name}
+        $CC ${name}.c ${if static then "-static" else ""} $CFLAGS $EXTRA_CFLAGS \
+          $(pkg-config --libs --cflags ${staticPkgConfigParam} servicepoint) \
+          $(pkg-config --libs --cflags ${staticPkgConfigParam} liblzma) \
+          -o $out/bin/${name}
       '';
     };
-  rustPlatform-stable = pkgs.rustPlatform;
-  rustPlatform-unstable = pkgs.makeRustPlatform {
-    cargo = fenix.minimal.cargo;
-    rustc = fenix.minimal.rustc;
-  };
-  rustPlatform-musl-stable = pkgs.pkgsMusl.rustPlatform;
-  rustPlatform-musl-unstable = pkgs.pkgsMusl.makeRustPlatform {
-    cargo = fenix.minimal.cargo;
-    rustc = fenix.minimal.rustc;
-  };
   examples = [
     "announce"
     "brightness_tester"
@@ -92,6 +93,12 @@ let
     "random_stuff"
     "wiping_clear"
   ];
+  mkAllExamples =
+    suffix:
+    pkgs.symlinkJoin {
+      name = "servicepoint-all-examples";
+      paths = builtins.map (e: selfPkgs."${e}${suffix}") examples;
+    };
   size-cflags = [
     "-Oz"
     "-fwrapv"
@@ -112,54 +119,57 @@ let
     "-Wl,--gc-sections"
     "-Wl,--exclude-libs,ALL"
   ];
-  servicepoint-stable-size-args = {
+  stable-size-args = {
     buildType = "size_optimized";
     buildNoDefaultFeatures = true;
   };
-  servicepoint-unstable-size-args = {
-    # TODO: do these override the nix flags?
-    CARGOFLAGS = ''-Zbuild-std="core,std,alloc,proc_macro,panic_abort" -Zbuild-std-features="panic_immediate_abort"'';
+  unstable-size-args = {
+    cargoBuildFlags = ''-Zbuild-std="core,std,alloc,proc_macro,panic_abort" -Zbuild-std-features="panic_immediate_abort"'';
     # TODO: those override the nix flags
     # NIX_CFLAGS_COMPILE = builtins.toString ["-Oz" "-fwrapv" "-fomit-frame-pointer" "-fno-stack-protector" "-fno-unroll-loops" "-fno-unwind-tables" "-fno-asynchronous-unwind-tables" "-fmerge-all-constants" "-fvisibility=hidden" "-Bsymbolic" "-fno-ident" "-fno-exceptions" "-ffunction-sections" "-fdata-sections"];
     # NIX_CFLAGS_LINK = builtins.toString ["Wl,-z,norelro" "-Wl,--hash-style=gnu" "-Wl,--gc-sections" "-Wl,--exclude-libs,ALL"];
   };
-  mkAllExamples =
-    suffix:
-    pkgs.symlinkJoin {
-      name = "servicepoint-all-examples";
-      paths = builtins.map (e: selfPkgs."${e}${suffix}") examples;
-    };
-in
-rec {
-  servicepoint-binding-c-stable-release = mkServicepoint {
+  rustPlatform-stable = pkgs.rustPlatform;
+  rustPlatform-nightly = pkgs.makeRustPlatform {
+    inherit (fenix.minimal) cargo rustc;
+  };
+  rustPlatform-musl-stable = pkgs.pkgsMusl.rustPlatform;
+  rustPlatform-musl-nightly = pkgs.pkgsMusl.makeRustPlatform {
+    inherit (fenix.minimal) cargo rustc;
+  };
+  stable-release-args = {
     inherit pkgs;
     rustPlatform = rustPlatform-stable;
   };
-  servicepoint-binding-c-nightly-release = mkServicepoint {
+  nightly-release-args = {
     inherit pkgs;
-    rustPlatform = rustPlatform-unstable;
+    rustPlatform = rustPlatform-nightly;
   };
-  servicepoint-binding-c-musl-stable-release = mkServicepoint {
+  musl-stable-release-args = {
     pkgs = pkgs.pkgsMusl;
     rustPlatform = rustPlatform-musl-stable;
   };
-  servicepoint-binding-c-musl-nightly-release = mkServicepoint {
+  musl-nightly-release-args = {
     pkgs = pkgs.pkgsMusl;
-    rustPlatform = rustPlatform-musl-unstable;
+    rustPlatform = rustPlatform-musl-nightly;
   };
+in
+rec {
+  servicepoint-binding-c-stable-release = mkServicepoint stable-release-args;
+  servicepoint-binding-c-nightly-release = mkServicepoint nightly-release-args;
+  servicepoint-binding-c-musl-stable-release = mkServicepoint musl-stable-release-args;
+  servicepoint-binding-c-musl-nightly-release = mkServicepoint musl-nightly-release-args;
 
-  servicepoint-binding-c-stable-size =
-    servicepoint-binding-c-stable-release // servicepoint-stable-size-args;
-  servicepoint-binding-c-nightly-size =
-    servicepoint-binding-c-nightly-release
-    // servicepoint-stable-size-args
-    // servicepoint-unstable-size-args;
-  servicepoint-binding-c-musl-stable-size =
-    servicepoint-binding-c-musl-stable-release // servicepoint-stable-size-args;
-  servicepoint-binding-c-musl-nightly-size =
-    servicepoint-binding-c-musl-nightly-release
-    // servicepoint-stable-size-args
-    // servicepoint-unstable-size-args;
+  servicepoint-binding-c-stable-size = mkServicepoint (stable-release-args // stable-size-args);
+  servicepoint-binding-c-nightly-size = mkServicepoint (
+    nightly-release-args // stable-size-args // unstable-size-args
+  );
+  servicepoint-binding-c-musl-stable-size = mkServicepoint (
+    musl-stable-release-args // stable-size-args
+  );
+  servicepoint-binding-c-musl-nightly-size = mkServicepoint (
+    musl-nightly-release-args // stable-size-args // unstable-size-args
+  );
 
   # default variants
   servicepoint-binding-c = servicepoint-binding-c-stable-release;
@@ -181,26 +191,16 @@ rec {
   }
 ))
 # construct another pakage per example, but optimized for size with unstable rust
-// (lib.mapAttrs'
-  (
-    name: value:
-    lib.nameValuePair ("${name}-size") (
-      value
-      // {
-        EXTRA_CFLAGS = builtins.toString size-cflags;
-      }
-    )
+// (lib.mapAttrs' (name: value: lib.nameValuePair ("${name}-size") value) (
+  lib.genAttrs examples (
+    name:
+    mkExample {
+      inherit name pkgs;
+      servicepointBinding = selfPkgs.servicepoint-binding-c-nightly-size;
+      EXTRA_CFLAGS = builtins.toString size-cflags;
+    }
   )
-  (
-    lib.genAttrs examples (
-      name:
-      mkExample {
-        inherit name pkgs;
-        servicepointBinding = selfPkgs.servicepoint-binding-c-nightly-size;
-      }
-    )
-  )
-)
+))
 # construct another pakage per example, but with musl
 // (lib.mapAttrs' (name: value: lib.nameValuePair ("${name}-musl") value) (
   lib.genAttrs examples (
@@ -220,9 +220,7 @@ rec {
       inherit name;
       pkgs = pkgs.pkgsMusl;
       servicepointBinding = selfPkgs.servicepoint-binding-c-musl;
-    }
-    // {
-      EXTRA_CFLAGS = "-static";
+      static = true;
     }
   )
 ))
@@ -234,9 +232,8 @@ rec {
       inherit name;
       pkgs = pkgs.pkgsMusl;
       servicepointBinding = selfPkgs.servicepoint-binding-c-musl;
-    }
-    // {
-      EXTRA_CFLAGS = "-static" + builtins.toString size-cflags;
+      static = true;
+      EXTRA_CFLAGS = builtins.toString size-cflags;
     }
   )
 ))