diff --git a/README.md b/README.md
index cd84212..90451da 100644
--- a/README.md
+++ b/README.md
@@ -8,3 +8,7 @@ Warning: `leaf` won't deal with the dependence relation, and currently won't che
 - Use `ensurepip` in *Chapter 7.10. Python-3.13.2*
 - Use `SBINDIR=/usr/bin/` to install `iproute2`. `ip` command should be avaliable for non-root
 - We won't install TeX files in *Chapter 8.72. Texinfo-7.2*. We will install TexLive.
+
+## issues
+- `lfs/vim-9.1.1166` has `Test_write_backup_symlink` failed, which can pass if `call assert_true(filereadable('./Xbackup/Xwbsfile.bak'))
+` is commented. Seams like cannot create this backup file.
diff --git a/lfs/vim-9.1.1166.PKGBUILD b/lfs/vim-9.1.1166.PKGBUILD
new file mode 100644
index 0000000..a9f9af3
--- /dev/null
+++ b/lfs/vim-9.1.1166.PKGBUILD
@@ -0,0 +1,42 @@
+pkgname=vim
+pkgver=9.1.1166
+_versiondir=91
+pkgdesc='Vi Improved, a highly configurable, improved version of the vi text editor'
+home='https://www.vim.org'
+arch=('x86_64')
+license=('custom:vim')
+sources=("${pkgname}-${pkgver}.tar.gz")
+urls=("https://github.com/vim/vim/archive/v${pkgver}/${sources[0]}")
+md5sums=("718d43ce957ab7c81071793de176c2eb")
+
+src_prepare() {
+  tar -xf ${distdir}/${sources[0]} --strip-components=1
+  echo '#define SYS_VIMRC_FILE "/etc/vimrc"' >> src/feature.h
+}
+
+src_build() {
+  ./configure --prefix=/usr   \
+              --disable-gui   \
+              --with-x=no     \
+              --with-compiledby='LFS'
+  make
+}
+
+src_check() {
+  leaf_record_message "Tests require at least 24 lines with 80 characters."
+  chown -R leaf .
+  sed '/test_plugin_glvs/d' -i src/testdir/Make_all.mak
+  echo "Testing... May take a while..."
+  su leaf -c "TERM=xterm-256color LANG=en_US.UTF-8 make -j1 test" \
+   &> vim-test.log
+}
+
+src_install() {
+  make DESTDIR="${pkgdir}" install
+  ln -sv vim ${pkgdir}/usr/bin/vi
+  for L in  ${pkgdir}/usr/share/man/{,*/}man1/vim.1; do
+    ln -sv vim.1 $(dirname $L)/vi.1
+  done
+  install -d ${pkgdir}/usr/share/doc/
+  ln -sv ../vim/vim${_versiondir}/doc ${pkgdir}/usr/share/doc/vim-${pkgver}
+}