diff --git a/display/display.c b/display/display.c
index 615d89f..54195c1 100644
--- a/display/display.c
+++ b/display/display.c
@@ -10,11 +10,12 @@ Lumeto is distributed in the hope that it will be useful, but WITHOUT ANY WARRAN
 You should have received a copy of the GNU General Public License along with Lumeto. If not, see <https://www.gnu.org/licenses/>.
 */
 
-#include <stdlib.h>
-#include <display.h>
-#include <util/delay.h>
 #include <base.h>
 #include <stdio.h>
+#include <stdlib.h>
+#include <util/delay.h>
+
+#include "display.h"
 
 #define ENABLE   _BV(5)
 #define CHARCODE _BV(4)
diff --git a/flake.nix b/flake.nix
index cc38445..3547a5c 100644
--- a/flake.nix
+++ b/flake.nix
@@ -50,6 +50,138 @@
             '';
         };
 
+      packages."x86_64-linux"."sk9822" =
+        { mcu, chip_select, f_cpu }:
+        let
+          pkgs = import nixpkgs { system = "x86_64-linux"; };
+          avr = pkgs.pkgsCross.avr.buildPackages;
+        in pkgs.stdenv.mkDerivation rec {
+          name = "sk9822";
+          src = ./.;
+
+          buildInputs = [
+            (packages."x86_64-linux"."base" { inherit mcu chip_select f_cpu; })
+          ];
+
+          CFLAGS = cflags { inherit mcu chip_select f_cpu; };
+          INCLUDE_DIRS = pkgs.lib.concatStringsSep " " (map (dir: "-I${dir}") buildInputs);
+          OBJECT_FILES = pkgs.lib.concatStringsSep " " (map (dir: "${dir}/*.o") buildInputs);
+
+          buildPhase = ''
+            ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o sk9822.o -c ${src}/sk9822/sk9822.c
+            '';
+          installPhase = ''
+            mkdir $out
+            cp sk9822/sk9822.h sk9822.o $out/
+            '';
+        };
+
+      packages."x86_64-linux"."shift-register" =
+        { mcu, chip_select, f_cpu }:
+        let
+          pkgs = import nixpkgs { system = "x86_64-linux"; };
+          avr = pkgs.pkgsCross.avr.buildPackages;
+        in pkgs.stdenv.mkDerivation rec {
+          name = "shift-register";
+          src = ./.;
+
+          buildInputs = [
+            (packages."x86_64-linux"."base" { inherit mcu chip_select f_cpu; })
+          ];
+
+          CFLAGS = cflags { inherit mcu chip_select f_cpu; };
+          INCLUDE_DIRS = pkgs.lib.concatStringsSep " " (map (dir: "-I${dir}") buildInputs);
+          OBJECT_FILES = pkgs.lib.concatStringsSep " " (map (dir: "${dir}/*.o") buildInputs);
+
+          buildPhase = ''
+            ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o shift_register.o -c ${src}/shift_register/shift_register.c
+            '';
+          installPhase = ''
+            mkdir $out
+            cp shift_register/shift_register.h shift_register.o $out/
+            '';
+        };
+
+      packages."x86_64-linux"."spi" =
+        { mcu, chip_select, f_cpu }:
+        let
+          pkgs = import nixpkgs { system = "x86_64-linux"; };
+          avr = pkgs.pkgsCross.avr.buildPackages;
+        in pkgs.stdenv.mkDerivation rec {
+          name = "spi";
+          src = ./.;
+
+          buildInputs = [
+            (packages."x86_64-linux"."base" { inherit mcu chip_select f_cpu; })
+          ];
+
+          CFLAGS = cflags { inherit mcu chip_select f_cpu; };
+          INCLUDE_DIRS = pkgs.lib.concatStringsSep " " (map (dir: "-I${dir}") buildInputs);
+          OBJECT_FILES = pkgs.lib.concatStringsSep " " (map (dir: "${dir}/*.o") buildInputs);
+
+          buildPhase = ''
+            ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o spi.o -c ${src}/spi/spi.c
+            '';
+          installPhase = ''
+            mkdir $out
+            cp spi/spi.h spi.o $out/
+            '';
+        };
+
+      packages."x86_64-linux"."rfm" =
+        { mcu, chip_select, f_cpu }:
+        let
+          pkgs = import nixpkgs { system = "x86_64-linux"; };
+          avr = pkgs.pkgsCross.avr.buildPackages;
+        in pkgs.stdenv.mkDerivation rec {
+          name = "rfm";
+          src = ./.;
+
+          buildInputs = [
+            (packages."x86_64-linux"."base" { inherit mcu chip_select f_cpu; })
+            (packages."x86_64-linux"."spi" { inherit mcu chip_select f_cpu; })
+          ];
+
+          CFLAGS = cflags { inherit mcu chip_select f_cpu; };
+          INCLUDE_DIRS = pkgs.lib.concatStringsSep " " (map (dir: "-I${dir}") buildInputs);
+          OBJECT_FILES = pkgs.lib.concatStringsSep " " (map (dir: "${dir}/*.o") buildInputs);
+
+          buildPhase = ''
+            ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o rfm.o -c ${src}/rfm69hcw/rfm.c
+            '';
+          installPhase = ''
+            mkdir $out
+            cp rfm69hcw/rfm.h rfm.o $out/
+            '';
+        };
+
+      packages."x86_64-linux"."display" =
+        { mcu, chip_select, f_cpu }:
+        let
+          pkgs = import nixpkgs { system = "x86_64-linux"; };
+          avr = pkgs.pkgsCross.avr.buildPackages;
+        in pkgs.stdenv.mkDerivation rec {
+          name = "display";
+          src = ./.;
+
+          buildInputs = [
+            (packages."x86_64-linux"."base" { inherit mcu chip_select f_cpu; })
+            (packages."x86_64-linux"."shift-register" { inherit mcu chip_select f_cpu; })
+          ];
+
+          CFLAGS = cflags { inherit mcu chip_select f_cpu; };
+          INCLUDE_DIRS = pkgs.lib.concatStringsSep " " (map (dir: "-I${dir}") buildInputs);
+          OBJECT_FILES = pkgs.lib.concatStringsSep " " (map (dir: "${dir}/*.o") buildInputs);
+
+          buildPhase = ''
+            ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o display.o -c ${src}/display/display.c
+            '';
+          installPhase = ''
+            mkdir $out
+            cp display/display.h display.o $out/
+            '';
+        };
+
       packages."x86_64-linux"."flame" =
         { mcu, chip_select, f_cpu }:
         let
@@ -59,21 +191,18 @@
           name = "flame";
           src = ./.;
 
-          CFLAGS = cflags { inherit mcu chip_select f_cpu; };
-
           buildInputs = [
             (packages."x86_64-linux"."base" { inherit mcu chip_select f_cpu; })
+            (packages."x86_64-linux"."sk9822" { inherit mcu chip_select f_cpu; })
           ];
 
+          CFLAGS = cflags { inherit mcu chip_select f_cpu; };
           INCLUDE_DIRS = pkgs.lib.concatStringsSep " " (map (dir: "-I${dir}") buildInputs);
           OBJECT_FILES = pkgs.lib.concatStringsSep " " (map (dir: "${dir}/*.o") buildInputs);
 
           buildPhase = ''
-            set -x
-            echo Object files: ${OBJECT_FILES}
-            ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o sk9822.o -c ${src}/sk9822/sk9822.c
-            ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -I${src}/sk9822 -o main.o -c ${src}/flame/main.c
-            ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o flame.elf main.o sk9822.o ${OBJECT_FILES}
+            ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o main.o -c ${src}/flame/main.c
+            ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o flame.elf main.o ${OBJECT_FILES}
             $OBJCOPY -O ihex flame.elf flame.hex
             '';
           installPhase = ''
@@ -92,18 +221,24 @@
           name = "prime-tx";
           src = ./.;
 
-          includes = [ "base" "spi" "shift_register" "rfm69hcw" "display" ];
+          # includes = [ "base" "spi" "shift_register" "rfm69hcw" "display" ];
+
+          buildInputs = [
+            (packages."x86_64-linux"."base" { inherit mcu chip_select f_cpu; })
+            (packages."x86_64-linux"."spi" { inherit mcu chip_select f_cpu; })
+            (packages."x86_64-linux"."shift-register" { inherit mcu chip_select f_cpu; })
+            (packages."x86_64-linux"."rfm" { inherit mcu chip_select f_cpu; })
+            (packages."x86_64-linux"."display" { inherit mcu chip_select f_cpu; })
+          ];
 
           CFLAGS = cflags { inherit mcu chip_select f_cpu; };
-          INCLUDE_DIRS = lib.concatStringsSep " " (map (dir: "-I${src}/${dir}") includes);
+          INCLUDE_DIRS = pkgs.lib.concatStringsSep " " (map (dir: "-I${dir}") buildInputs);
+          OBJECT_FILES = pkgs.lib.concatStringsSep " " (map (dir: "${dir}/*.o") buildInputs);
+
 
           buildPhase = ''
-            ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o rfm.o -c ${src}/rfm69hcw/rfm.c
-            ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o spi.o -c ${src}/spi/spi.c
-            ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o reg.o -c ${src}/shift_register/shift_register.c
-            ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o display.o -c ${src}/display/display.c
             ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o main.o -c ${src}/prime-tx/main.c
-            ${avr.gcc}/bin/avr-gcc ${CFLAGS} -o prime-tx.elf main.o display.o spi.o rfm.o reg.o
+            ${avr.gcc}/bin/avr-gcc ${CFLAGS} -o prime-tx.elf main.o ${OBJECT_FILES}
             $OBJCOPY -O ihex prime-tx.elf prime-tx.hex
             '';
           installPhase = ''
diff --git a/rfm69hcw/rfm.c b/rfm69hcw/rfm.c
index ebd1c2a..a89dd42 100644
--- a/rfm69hcw/rfm.c
+++ b/rfm69hcw/rfm.c
@@ -11,8 +11,8 @@ You should have received a copy of the GNU General Public License along with Lum
 */
 
 
-#include <rfm.h>
 #include <stdio.h>
+#include "rfm.h"
 
 #define REG_FIFO                0x00
 #define REG_OP_MODE             0x01
diff --git a/rfm69hcw/rfm.h b/rfm69hcw/rfm.h
index 5b94ccd..d786627 100644
--- a/rfm69hcw/rfm.h
+++ b/rfm69hcw/rfm.h
@@ -16,7 +16,6 @@ You should have received a copy of the GNU General Public License along with Lum
 #include <base.h>
 #include <spi.h>
 #include <stdbool.h>
-#include <display.h>
 
 typedef enum RFM_ERROR_TYPES {
     Ok,
diff --git a/shift_register/shift_register.c b/shift_register/shift_register.c
index 50d12ec..ce99177 100644
--- a/shift_register/shift_register.c
+++ b/shift_register/shift_register.c
@@ -12,7 +12,7 @@ You should have received a copy of the GNU General Public License along with Lum
 
 #include <util/delay.h>
 #include <base.h>
-#include <shift_register.h>
+#include "shift_register.h"
 
 void sr_strobe_line(dio_t *line) {
     dio_set(line, 1);
diff --git a/spi/spi.c b/spi/spi.c
index c9f3855..ac3d4ed 100644
--- a/spi/spi.c
+++ b/spi/spi.c
@@ -11,8 +11,8 @@ You should have received a copy of the GNU General Public License along with Lum
 */
 
 
-#include <spi.h>
 #include <util/delay.h>
+#include "spi.h"
 
 void spi_initialize(spi_t *spi) {
     dio_set_direction(&spi->clock, LINE_OUT);