diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 0000000..66643fd
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,63 @@
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+jobs:
+  build-macos:
+    runs-on: macos-latest
+    strategy:
+      fail-fast: false
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: nasm
+      run: brew install nasm 
+
+    - name: x86_64-elf-gcc
+      run: brew install x86_64-elf-gcc
+
+    - name: setup
+      run: ./setup.sh
+
+    - name: build
+      run: ./build.sh
+
+  build-ubuntu:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: install nasm
+      run: sudo apt install nasm
+
+    - name: setup
+      run: ./setup.sh
+
+    - name: build
+      run: ./build.sh
+
+  build-windows:
+    runs-on: windows-latest
+    strategy:
+      fail-fast: false
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: install packages
+      run: choco install nasm mingw
+
+    - name: setup
+      run: ./setup.sh
+
+    - name: build
+      run: ./build.sh
+
+      
diff --git a/.gitignore b/.gitignore
index c51b481..d501f92 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,5 +3,5 @@ bin/*
 src/libBareMetal.asm
 src/libBareMetal.c
 src/libBareMetal.h
-src/*.o
+**/*.o
 .vscode/
\ No newline at end of file
diff --git a/build.sh b/build.sh
index e1ea0ba..cc34d91 100755
--- a/build.sh
+++ b/build.sh
@@ -1,34 +1,37 @@
 #!/usr/bin/env bash
 
-CFLAGS="-c -m64 -nostdlib -nostartfiles -nodefaultlibs -ffreestanding -falign-functions=16 -fomit-frame-pointer -mno-red-zone -fno-builtin"
+source cross.sh
 
 cd src
-nasm hello.asm -o ../bin/hello.app -l ../bin/hello-debug.txt
-nasm sysinfo.asm -o ../bin/sysinfo.app -l ../bin/sysinfo-debug.txt
-nasm euler1.asm -o ../bin/euler1.app
-nasm ethtest.asm -o ../bin/ethtest.app
-nasm smptest.asm -o ../bin/smptest.app
-nasm systest.asm -o ../bin/systest.app
-nasm uitest.asm -o ../bin/uitest.app
-nasm mouse.asm -o ../bin/mouse.app
-if [ "$(uname)" != "Darwin" ]; then
-	gcc $CFLAGS -o crt0.o crt0.c
-	gcc $CFLAGS -o libBareMetal.o libBareMetal.c
-	gcc $CFLAGS -o helloc.o helloc.c
-	ld -T c.ld -o ../bin/helloc.app crt0.o helloc.o libBareMetal.o
-	gcc $CFLAGS -o uitestc.o uitestc.c
-	ld -T c.ld -o ../bin/uitestc.app crt0.o uitestc.o libBareMetal.o
-	gcc $CFLAGS -o raytrace.o raytrace.c
-	ld -T c.ld -o ../bin/raytrace.app crt0.o raytrace.o libBareMetal.o
-	gcc $CFLAGS -o gavare.o gavare.c
-	ld -T c.ld -o ../bin/gavare.app crt0.o gavare.o libBareMetal.o
-	gcc $CFLAGS -o minIP.o minIP.c
-	ld -T c.ld -o ../bin/minIP.app crt0.o minIP.o libBareMetal.o
-	gcc $CFLAGS -o cube3d.o cube3d.c
-	ld -T c.ld -o ../bin/cube3d.app crt0.o cube3d.o libBareMetal.o
-	gcc $CFLAGS -o color-plasma.o color-plasma.c
-	ld -T c.ld -o ../bin/color-plasma.app crt0.o color-plasma.o libBareMetal.o
-	gcc $CFLAGS -o ./3d-model-loader/3d-model-loader.o ./3d-model-loader/3d-model-loader.c
-	ld -T c.ld -o ../bin/3d-model-loader.app crt0.o ./3d-model-loader/3d-model-loader.o libBareMetal.o
-fi
+
+# Assembler programs
+$NASM hello.asm -o ../bin/hello.app -l ../bin/hello-debug.txt
+$NASM sysinfo.asm -o ../bin/sysinfo.app -l ../bin/sysinfo-debug.txt
+$NASM euler1.asm -o ../bin/euler1.app
+$NASM ethtest.asm -o ../bin/ethtest.app
+$NASM smptest.asm -o ../bin/smptest.app
+$NASM systest.asm -o ../bin/systest.app
+$NASM uitest.asm -o ../bin/uitest.app
+$NASM mouse.asm -o ../bin/mouse.app
+
+# C programs
+$CC $CFLAGS -o crt0.o crt0.c
+$CC $CFLAGS -o libBareMetal.o libBareMetal.c
+$CC $CFLAGS -o helloc.o helloc.c
+$LD $LDFLAGS -T c.ld -o ../bin/helloc.app crt0.o helloc.o libBareMetal.o
+$CC $CFLAGS -o uitestc.o uitestc.c
+$LD $LDFLAGS -T c.ld -o ../bin/uitestc.app crt0.o uitestc.o libBareMetal.o
+$CC $CFLAGS -o raytrace.o raytrace.c
+$LD $LDFLAGS -T c.ld -o ../bin/raytrace.app crt0.o raytrace.o libBareMetal.o
+$CC $CFLAGS -o gavare.o gavare.c
+$LD $LDFLAGS -T c.ld -o ../bin/gavare.app crt0.o gavare.o libBareMetal.o
+$CC $CFLAGS -o minIP.o minIP.c
+$LD $LDFLAGS -T c.ld -o ../bin/minIP.app crt0.o minIP.o libBareMetal.o
+$CC $CFLAGS -o cube3d.o cube3d.c
+$LD $LDFLAGS -T c.ld -o ../bin/cube3d.app crt0.o cube3d.o libBareMetal.o
+$CC $CFLAGS -o color-plasma.o color-plasma.c
+$LD $LDFLAGS -T c.ld -o ../bin/color-plasma.app crt0.o color-plasma.o libBareMetal.o
+$CC $CFLAGS -o ./3d-model-loader/3d-model-loader.o ./3d-model-loader/3d-model-loader.c
+$LD $LDFLAGS -T c.ld -o ../bin/3d-model-loader.app crt0.o ./3d-model-loader/3d-model-loader.o libBareMetal.o
+
 cd ..
diff --git a/cross.sh b/cross.sh
new file mode 100644
index 0000000..3e1e933
--- /dev/null
+++ b/cross.sh
@@ -0,0 +1,18 @@
+
+#!/usr/bin/env bash
+
+if [ "$(uname)" != "Darwin" ]; then
+# linux
+CC=gcc
+LD=ld
+CFLAGS="-c -m64 -nostdlib -nostartfiles -nodefaultlibs -ffreestanding -falign-functions=16 -fomit-frame-pointer -mno-red-zone -fno-builtin"
+LDFLAGS=
+NASM=nasm
+else
+# darwin
+CC=x86_64-elf-gcc
+LD=x86_64-elf-ld
+CFLAGS="-c -m64 -nostdlib -nodefaultlibs -ffreestanding -falign-functions=16 -fomit-frame-pointer -mno-red-zone -fno-builtin"
+LDFLAGS=
+NASM=nasm
+fi
diff --git a/src/3d-model-loader/3d-model-loader.o b/src/3d-model-loader/3d-model-loader.o
deleted file mode 100644
index d308e43..0000000
Binary files a/src/3d-model-loader/3d-model-loader.o and /dev/null differ