diff --git a/BAN/include/BAN/Span.h b/BAN/include/BAN/Span.h
index a6b4ad09..ff3e6332 100644
--- a/BAN/include/BAN/Span.h
+++ b/BAN/include/BAN/Span.h
@@ -43,6 +43,8 @@ namespace BAN
 
 		Span slice(size_type, size_type = ~size_type(0));
 
+		Span<const T> as_const() const { return Span<const T>(m_data, m_size); }
+
 	private:
 		T* m_data = nullptr;
 		size_type m_size = 0;
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5803ea0a..0c5cc6ce 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -39,6 +39,14 @@ set(BANAN_BIN ${BANAN_SYSROOT}/usr/bin)
 set(BANAN_BOOT ${BANAN_SYSROOT}/boot)
 set(DISK_IMAGE_PATH ${CMAKE_BINARY_DIR}/banan-os.img)
 
+set(BANAN_SCRIPT_ENV 
+	BANAN_ARCH="${BANAN_ARCH}" 
+	DISK_IMAGE_PATH="${DISK_IMAGE_PATH}" 
+	SYSROOT="${BANAN_SYSROOT}" 
+	TOOLCHAIN_PREFIX="${TOOLCHAIN_PREFIX}" 
+	UEFI_BOOT="${UEFI_BOOT}" 
+)
+
 add_subdirectory(kernel)
 add_subdirectory(BAN)
 add_subdirectory(libc)
@@ -59,7 +67,7 @@ add_custom_target(headers
 )
 
 add_custom_target(toolchain
-	COMMAND ${CMAKE_COMMAND} -E env SYSROOT="${BANAN_SYSROOT}" PREFIX="${TOOLCHAIN_PREFIX}" ARCH="${BANAN_ARCH}" ${CMAKE_SOURCE_DIR}/toolchain/build.sh
+	COMMAND ${CMAKE_COMMAND} -E env ${BANAN_SCRIPT_ENV} ${CMAKE_SOURCE_DIR}/toolchain/build.sh
 	DEPENDS headers
 	USES_TERMINAL
 )
@@ -71,7 +79,7 @@ add_custom_target(libstdc++
 )
 
 add_custom_target(image
-	COMMAND ${CMAKE_COMMAND} -E env BANAN_ARCH="${BANAN_ARCH}" SYSROOT="${BANAN_SYSROOT}" DISK_IMAGE_PATH="${DISK_IMAGE_PATH}" TOOLCHAIN="${TOOLCHAIN_PREFIX}" UEFI_BOOT="${UEFI_BOOT}" ${CMAKE_SOURCE_DIR}/image.sh
+	COMMAND ${CMAKE_COMMAND} -E env ${BANAN_SCRIPT_ENV} ${CMAKE_SOURCE_DIR}/image.sh
 	DEPENDS kernel-install
 	DEPENDS ban-install
 	DEPENDS libc-install
@@ -81,7 +89,7 @@ add_custom_target(image
 )
 
 add_custom_target(image-full
-	COMMAND ${CMAKE_COMMAND} -E env BANAN_ARCH="${BANAN_ARCH}" SYSROOT="${BANAN_SYSROOT}" DISK_IMAGE_PATH="${DISK_IMAGE_PATH}" TOOLCHAIN="${TOOLCHAIN_PREFIX}" UEFI_BOOT="${UEFI_BOOT}" ${CMAKE_SOURCE_DIR}/image-full.sh
+	COMMAND ${CMAKE_COMMAND} -E env ${BANAN_SCRIPT_ENV} ${CMAKE_SOURCE_DIR}/image-full.sh
 	DEPENDS kernel-install
 	DEPENDS ban-install
 	DEPENDS libc-install
@@ -91,30 +99,30 @@ add_custom_target(image-full
 )
 
 add_custom_target(check-fs
-	COMMAND ${CMAKE_COMMAND} -E env DISK_IMAGE_PATH="${DISK_IMAGE_PATH}" ${CMAKE_SOURCE_DIR}/check-fs.sh
+	COMMAND ${CMAKE_COMMAND} -E env ${BANAN_SCRIPT_ENV} ${CMAKE_SOURCE_DIR}/check-fs.sh
 	USES_TERMINAL
 )
 
 add_custom_target(qemu
-	COMMAND ${CMAKE_COMMAND} -E env BANAN_ARCH="${BANAN_ARCH}" DISK_IMAGE_PATH="${DISK_IMAGE_PATH}" UEFI_BOOT="${UEFI_BOOT}" ${CMAKE_SOURCE_DIR}/qemu.sh -serial stdio ${QEMU_ACCEL}
+	COMMAND ${CMAKE_COMMAND} -E env ${BANAN_SCRIPT_ENV} ${CMAKE_SOURCE_DIR}/qemu.sh -serial stdio ${QEMU_ACCEL}
 	DEPENDS image
 	USES_TERMINAL
 )
 
 add_custom_target(qemu-nographic
-	COMMAND ${CMAKE_COMMAND} -E env BANAN_ARCH="${BANAN_ARCH}" DISK_IMAGE_PATH="${DISK_IMAGE_PATH}" UEFI_BOOT="${UEFI_BOOT}" ${CMAKE_SOURCE_DIR}/qemu.sh -nographic ${QEMU_ACCEL}
+	COMMAND ${CMAKE_COMMAND} -E env ${BANAN_SCRIPT_ENV} ${CMAKE_SOURCE_DIR}/qemu.sh -nographic ${QEMU_ACCEL}
 	DEPENDS image
 	USES_TERMINAL
 )
 
 add_custom_target(qemu-debug
-	COMMAND ${CMAKE_COMMAND} -E env BANAN_ARCH="${BANAN_ARCH}" DISK_IMAGE_PATH="${DISK_IMAGE_PATH}" UEFI_BOOT="${UEFI_BOOT}" ${CMAKE_SOURCE_DIR}/qemu.sh -serial stdio -d int -no-reboot
+	COMMAND ${CMAKE_COMMAND} -E env ${BANAN_SCRIPT_ENV} ${CMAKE_SOURCE_DIR}/qemu.sh -serial stdio -d int -no-reboot
 	DEPENDS image
 	USES_TERMINAL
 )
 
 add_custom_target(bochs
-	COMMAND ${CMAKE_COMMAND} -E env DISK_IMAGE_PATH="${DISK_IMAGE_PATH}" ${CMAKE_SOURCE_DIR}/bochs.sh
+	COMMAND ${CMAKE_COMMAND} -E env ${BANAN_SCRIPT_ENV} ${CMAKE_SOURCE_DIR}/bochs.sh
 	DEPENDS image
 	USES_TERMINAL
 )
diff --git a/image-full.sh b/image-full.sh
index 8ebc2ddc..7725c7f0 100755
--- a/image-full.sh
+++ b/image-full.sh
@@ -59,18 +59,18 @@ if [[ "$UEFI_BOOT" == "1" ]]; then
 	sudo mkfs.fat $PARTITION1 > /dev/null
 	sudo mount $PARTITION1 "$MOUNT_DIR"
 	sudo mkdir -p "$MOUNT_DIR/EFI/BOOT"
-	sudo "$TOOLCHAIN/bin/grub-mkstandalone" -O "$BANAN_ARCH-efi" -o "$MOUNT_DIR/EFI/BOOT/BOOTX64.EFI" "boot/grub/grub.cfg=$TOOLCHAIN/grub-memdisk.cfg"
+	sudo "$TOOLCHAIN_PREFIX/bin/grub-mkstandalone" -O "$BANAN_ARCH-efi" -o "$MOUNT_DIR/EFI/BOOT/BOOTX64.EFI" "boot/grub/grub.cfg=$TOOLCHAIN_PREFIX/grub-memdisk.cfg"
 	sudo umount "$MOUNT_DIR"
 
 	sudo mount $PARTITION2 "$MOUNT_DIR"
 	sudo mkdir -p "$MOUNT_DIR/boot/grub"
-	sudo cp "$TOOLCHAIN/grub-uefi.cfg" "$MOUNT_DIR/boot/grub/grub.cfg"
+	sudo cp "$TOOLCHAIN_PREFIX/grub-uefi.cfg" "$MOUNT_DIR/boot/grub/grub.cfg"
 	sudo umount "$MOUNT_DIR"
 else
 	sudo mount $PARTITION2 "$MOUNT_DIR"
 	sudo grub-install --no-floppy --target=i386-pc --modules="normal ext2 multiboot" --boot-directory="$MOUNT_DIR/boot" $LOOP_DEV
 	sudo mkdir -p "$MOUNT_DIR/boot/grub"
-	sudo cp "$TOOLCHAIN/grub-legacy-boot.cfg" "$MOUNT_DIR/boot/grub/grub.cfg"
+	sudo cp "$TOOLCHAIN_PREFIX/grub-legacy-boot.cfg" "$MOUNT_DIR/boot/grub/grub.cfg"
 	sudo umount "$MOUNT_DIR"
 fi
 
diff --git a/toolchain/build.sh b/toolchain/build.sh
index 1b9ec77d..8da3970e 100755
--- a/toolchain/build.sh
+++ b/toolchain/build.sh
@@ -19,19 +19,19 @@ if [[ -z $SYSROOT ]]; then
 	exit 1
 fi
 
-if [[ -z $PREFIX ]]; then
-	echo "You must set the PREFIX environment variable" >&2
+if [[ -z $TOOLCHAIN_PREFIX ]]; then
+	echo "You must set the TOOLCHAIN_PREFIX environment variable" >&2
 	exit 1
 fi
 
-if [[ -z $ARCH ]]; then
-	echo  "You must set the ARCH environment variable" >&2
+if [[ -z $BANAN_ARCH ]]; then
+	echo  "You must set the BANAN_ARCH environment variable" >&2
 	exit 1
 fi
 
-TARGET="${ARCH}-banan_os"
+TARGET="${BANAN_ARCH}-banan_os"
 
-if [ ! -f ${PREFIX}/bin/${TARGET}-ld ]; then
+if [ ! -f ${TOOLCHAIN_PREFIX}/bin/${TARGET}-ld ]; then
 
 	echo "Building ${BINUTILS_VERSION}"
 
@@ -49,7 +49,7 @@ if [ ! -f ${PREFIX}/bin/${TARGET}-ld ]; then
 
 	../../${BINUTILS_VERSION}/configure \
 		--target="$TARGET" \
-		--prefix="$PREFIX" \
+		--prefix="$TOOLCHAIN_PREFIX" \
 		--with-sysroot="$SYSROOT" \
 		--disable-nls \
 		--disable-werror
@@ -61,7 +61,7 @@ if [ ! -f ${PREFIX}/bin/${TARGET}-ld ]; then
 
 fi
 
-if [ ! -f ${PREFIX}/bin/${TARGET}-g++ ]; then
+if [ ! -f ${TOOLCHAIN_PREFIX}/bin/${TARGET}-g++ ]; then
 
 	echo "Building ${GCC_VERSION}"
 
@@ -79,7 +79,7 @@ if [ ! -f ${PREFIX}/bin/${TARGET}-g++ ]; then
 
 	../../${GCC_VERSION}/configure \
 		--target="$TARGET" \
-		--prefix="$PREFIX" \
+		--prefix="$TOOLCHAIN_PREFIX" \
 		--with-sysroot="$SYSROOT" \
 		--disable-nls \
 		--enable-languages=c,c++
@@ -92,7 +92,7 @@ if [ ! -f ${PREFIX}/bin/${TARGET}-g++ ]; then
 
 fi
 
-if [ ! -f ${PREFIX}/bin/grub-mkstandalone ]; then
+if [ ! -f ${TOOLCHAIN_PREFIX}/bin/grub-mkstandalone ]; then
 
 	echo "Building ${GRUB_VERSION}"
 
@@ -108,8 +108,8 @@ if [ ! -f ${PREFIX}/bin/grub-mkstandalone ]; then
 	pushd build/${GRUB_VERSION}/
 
 	../../${GRUB_VERSION}/configure \
-		--target="$ARCH" \
-		--prefix="$PREFIX" \
+		--target="$BANAN_ARCH" \
+		--prefix="$TOOLCHAIN_PREFIX" \
 		--with-platform="efi" \
 		--disable-werror
 	
diff --git a/toolchain/local/.gitignore b/toolchain/local/.gitignore
new file mode 100644
index 00000000..0a00d701
--- /dev/null
+++ b/toolchain/local/.gitignore
@@ -0,0 +1 @@
+*/
\ No newline at end of file