diff --git a/.cross_env b/.cross_env
new file mode 100644
index 0000000..c1b9d32
--- /dev/null
+++ b/.cross_env
@@ -0,0 +1,8 @@
+#!/usr/bin/bash
+PREFIX="${PWD}/cross"
+TARGET=i686-elf
+PATH="${PWD}/cross/bin:${PATH}"
+
+export PATH \
+  TARGET \
+  PREFIX
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..cc01102
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+gcc.tar.gz
+binutils.tar.gz
+cross/
+gcc-*/
+binutils-*/
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..cf1ea79
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,79 @@
+BINUTILS_VERSION=2.38
+GCC_VERSION=11.2.0
+PREFIX=${PWD}/cross
+CROSS_BIN=${PREFIX}/bin
+TARGET=i686-elf
+export PATH:=${CROSS_BIN}:$(PATH)
+
+.PHONY: crossdev
+crossdev: install-binutils install-gcc install-target-libgcc
+
+.PHONY: install-binutils
+install-binutils: build-binutils ${CROSS_BIN}
+	@$(MAKE) -C binutils-${BINUTILS_VERSION}/build install
+
+.PHONY: install-gcc
+install-gcc: all-gcc ${CROSS_BIN}
+	@$(MAKE) -C gcc-${GCC_VERSION}/build $@
+
+.PHONY: install-target-libgcc
+install-target-libgcc: all-target-libgcc ${CROSS_BIN}
+	@$(MAKE) -C gcc-${GCC_VERSION}/build $@
+
+${CROSS_BIN}:
+	@mkdir -p $@
+
+.PHONY: build-binutils
+build-binutils: binutils-${BINUTILS_VERSION}/build/Makefile
+	@dirname $< | \
+		xargs \
+		$(MAKE) -C
+
+.PHONY: all-gcc
+all-gcc: gcc-${GCC_VERSION}/build/Makefile install-binutils
+	@dirname $< | \
+		xargs -I {} \
+		$(MAKE) -C {} $@
+
+.PHONY: all-target-libgcc
+all-target-libgcc: gcc-${GCC_VERSION}/build/Makefile install-binutils
+	@dirname $< | \
+		xargs -I {} \
+		$(MAKE) -C {} $@
+
+binutils-${BINUTILS_VERSION}/build/Makefile: binutils-${BINUTILS_VERSION}/build
+	@cd $< && \
+		../configure \
+		--target="${TARGET}" \
+		--prefix="${PREFIX}" \
+		--with-sysroot \
+		--disable-nls \
+		--disable-werror
+
+gcc-${GCC_VERSION}/build/Makefile: gcc-${GCC_VERSION}/build install-binutils
+	@cd $< && \
+		../configure \
+		--target="${TARGET}" \
+		--prefix="${PREFIX}" \
+		--disable-nls \
+		--enable-languages=c,c++ \
+		--without-headers
+
+binutils-${BINUTILS_VERSION}/build: binutils-${BINUTILS_VERSION}
+	@mkdir -p $@
+
+gcc-${GCC_VERSION}/build: gcc-${GCC_VERSION}
+	@mkdir -p $@
+
+binutils-${BINUTILS_VERSION}: binutils.tar.gz
+	@tar xf $<
+
+gcc-${GCC_VERSION}: gcc.tar.gz
+	@tar xf $<
+
+binutils.tar.gz:
+	@curl -o $@ https://ftp.gnu.org/gnu/binutils/binutils-${BINUTILS_VERSION}.tar.gz
+
+gcc.tar.gz:
+	@curl -o $@ https://ftp.gnu.org/gnu/gcc/gcc-${GCC_VERSION}/gcc-${GCC_VERSION}.tar.gz
+
diff --git a/README.md b/README.md
index 51b25a2..222fba9 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,26 @@
 # OS
+
+## GCC Cross-Compiler
+
+### Build requirements
+
+- Unix-like environment
+- GCC
+- Make
+- Bison
+- Flex
+- GMP
+- MPFR
+- MPC
+- Texinfo
+
+### Install
+
+```shell
+make crossdev
+```
+
+### Load the environment
+```shell
+source .cross_env
+```