diff --git a/Installer/unix_gcc_build.sh b/Installer/unix_gcc_build.sh
index 4746e1f..9638b93 100755
--- a/Installer/unix_gcc_build.sh
+++ b/Installer/unix_gcc_build.sh
@@ -10,11 +10,11 @@ do
     docker create --name ${container_name} ${image_name} || exit
 
     mkdir --parent build || exit
-    docker cp ${container_name}:/usr/local/docker/gcc-mostlyportable-${gcc_version} . || exit
+    docker cp ${container_name}:/usr/local/docker/mostlyportable-gcc/gcc-mostlyportable-${gcc_version} . || exit
 
     docker container rm ${container_name} || exit
 done
 
 if [[ $EUID == 0 ]]; then
-    chown --recursive ${USER} build
+    chown --recursive ${USER} gcc-mostlyportable-*
 fi
diff --git a/Installer/unix_gcc_dockerfile b/Installer/unix_gcc_dockerfile
index 62895b4..0a71a9f 100644
--- a/Installer/unix_gcc_dockerfile
+++ b/Installer/unix_gcc_dockerfile
@@ -27,6 +27,7 @@ WORKDIR /usr/local/docker
 ARG MOSTLY_PORTABLE_GCC_GIT_BRANCH=master
 RUN set -ex \
     && git clone https://github.com/Frogging-Family/mostlyportable-gcc \
+    && cd mostlyportable-gcc \
     && git checkout $MOSTLY_PORTABLE_GIT_BRANCH
 
 ARG GCC_VERSION=11.3.0
diff --git a/linux_install.sh b/linux_install.sh
index d132536..6b4b1f4 100755
--- a/linux_install.sh
+++ b/linux_install.sh
@@ -53,6 +53,11 @@ mkdir --parents ${bin_dir}
 
 # Tools
 # ------------------------------------------------------------------------------
+if ! command -v docker &> /dev/null
+then
+    curl -fsSL https://get.docker.com -o get-docker.sh
+    sudo sh get-docker.sh
+fi
 
 # CMake
 # ----------------------------------------------------------------------------
@@ -112,15 +117,15 @@ cp "${installer_dir}/unix_gcc_dockerfile" "${gcc_dir}/Dockerfile"
 
 cd "${gcc_dir}" || exit
     for gcc_version in ${gcc_version_list[@]}; do
-        gcc_bin_dir=${gcc_dir}
+        gcc_bin_dir=${gcc_dir}/gcc-mostlyportable-${gcc_version}/bin
         if [[ ! -f "${gcc_bin_dir}/g++" ]]; then
             ./build.sh ${gcc_version} || exit
-            ln -s ${gcc_bin_dir}/g++ ${bin_dir}/g++-${gcc_version} || exit
-            ln -s ${gcc_bin_dir}/gcc ${bin_dir}/gcc-${gcc_version} || exit
         fi
+        ln --symbolic --force --relative ${gcc_bin_dir}/g++ ${bin_dir}/g++-${gcc_version} || exit
+        ln --symbolic --force --relative ${gcc_bin_dir}/gcc ${bin_dir}/gcc-${gcc_version} || exit
     done
-    ln -s ${gcc_bin_dir}/g++ ${bin_dir}/g++ || exit
-    ln -s ${gcc_bin_dir}/gcc ${bin_dir}/gcc || exit
+    ln --symbolic --force --relative "${gcc_bin_dir}/g++" "${bin_dir}/g++" || exit
+    ln --symbolic --force --relative "${gcc_bin_dir}/gcc" "${bin_dir}/gcc" || exit
 cd "${root_dir}" || exit
 
 # LLVM/Clang