diff --git a/PKGMETA.yml b/PKGMETA.yml
index a691c721..bd256898 100644
--- a/PKGMETA.yml
+++ b/PKGMETA.yml
@@ -1,117 +1 @@
-packages:
-  filesystem:
-    internal: true
-  git-flow:
-    references:
-      aur: gitflow-avh
-  libcrypt:
-    references:
-      cygwin: crypt
-  lzo2:
-    references:
-      archlinux: lzo
-  mingw-w64-cross-binutils:
-    references:
-      archlinux: binutils
-  mingw-w64-cross-clang:
-    references:
-      archlinux: clang
-  mingw-w64-cross-compiler-rt:
-    references:
-      archlinux: compiler-rt
-  mingw-w64-cross-gcc:
-    references:
-      archlinux: gcc
-  mingw-w64-cross-windows-default-manifest:
-    references:
-      cygwin: windows-default-manifest
-  mingw-w64-cross-zlib:
-    references:
-      archlinux: zlib
-  mpc:
-    references:
-      archlinux: libmpc
-  msys2-keyring:
-    internal: true
-  msys2-runtime:
-    references:
-      cygwin: cygwin
-  msys2-w32api-headers:
-    references:
-      cygwin: w32api-runtime
-  msys2-w32api-runtime:
-    references:
-      cygwin: w32api-runtime
-  pacman-mirrors:
-    internal: true
-  perl-TermReadKey:
-    references:
-      archlinux: perl-term-readkey
-  perl-ack:
-    references:
-      archlinux: ack
-  python-mallard-ducktype:
-    references:
-      archlinux: mallard-ducktype
-  python-pyalpm:
-    references:
-      archlinux: pyalpm
-  tzcode:
-    references:
-      archlinux: tzdata
-  base-devel:
-    internal: true
-  base:
-    internal: true
-  glib2:
-    references:
-      cygwin: glib2.0
-  autoconf2.71:
-    references:
-      archlinux: autoconf
-  libqrencode:
-    references:
-      archlinux: qrencode
-  u-boot-tools:
-    references:
-      archlinux: uboot-tools
-  msys2-launcher:
-    internal: true
-  perl-Algorithm-Diff:
-    references:
-      cygwin: ~
-  colormake-git:
-    references:
-      archlinux: ~
-  mingw-w64-cross-tools:
-    references:
-      # doesn't exist, this is the next best thing
-      archlinux: mingw-w64-headers
-  mingw-w64-cross-winstorecompat:
-    references:
-      # doesn't exist, this is the next best thing
-      archlinux: mingw-w64-headers
-  mingw-w64-cross-winpthreads:
-    references:
-      archlinux: mingw-w64-winpthreads
-  mingw-w64-cross-crt:
-    references:
-      archlinux: mingw-w64-crt
-  mingw-w64-cross-headers:
-    references:
-      archlinux: mingw-w64-headers
-  mingw-w64-cross-clang-crt:
-    references:
-      archlinux: mingw-w64-crt
-  mingw-w64-cross-clang-headers:
-    references:
-      archlinux: mingw-w64-headers
-  mingw-w64-cross-ucrt-crt:
-    references:
-      archlinux: mingw-w64-crt
-  mingw-w64-cross-ucrt-headers:
-    references:
-      archlinux: mingw-w64-headers
-  editorconfig-vim:
-    references:
-      archlinux: vim-editorconfig
+packages: {}
\ No newline at end of file
diff --git a/autoconf2.71/PKGBUILD b/autoconf2.71/PKGBUILD
index ffa8268f..09e96965 100644
--- a/autoconf2.71/PKGBUILD
+++ b/autoconf2.71/PKGBUILD
@@ -31,6 +31,9 @@ sha256sums=('f14c83cfebcc9427f2c3cea7258bd90df972d92eb26752da4ddad81c87a0faa4'
             'c0e2215f983763587521c3925e6ebb73c6e2e8cd9ac1e5d649720252a26cca78'
             '65f2b02e96db437fc8fa974ba4b9db76eb9d053ceebcaf309c19f87eae3f8158'
             '402350041cbfb092321a5998f6abec6b0c59d3d03ae63735120e96a5a4a09d47')
+msys2_references=(
+  'archlinux: autoconf'
+)
 
 prepare() {
   cd ${srcdir}/${_realname}-${pkgver}
diff --git a/base-devel/PKGBUILD b/base-devel/PKGBUILD
index 394fb9d9..684776cf 100644
--- a/base-devel/PKGBUILD
+++ b/base-devel/PKGBUILD
@@ -33,3 +33,4 @@ depends=(
 # until that is fixed:
 source=('README.md')
 sha256sums=('3189b37877feaf3ab2bca4cb14aefe435c463aa0a3a74f7ee06327440b784a34')
+msys2_internal=true
diff --git a/base/PKGBUILD b/base/PKGBUILD
index b44f66c2..00370827 100644
--- a/base/PKGBUILD
+++ b/base/PKGBUILD
@@ -48,3 +48,4 @@ depends=(
 # until that is fixed:
 source=('README.md')
 sha256sums=('46702e24eebde5cf8fbb3d412a524736ef10d16e9c85efa0fc8d256cccf00484')
+msys2_internal=true
diff --git a/colormake-git/PKGBUILD b/colormake-git/PKGBUILD
index 57bcb7dc..c9bebefe 100644
--- a/colormake-git/PKGBUILD
+++ b/colormake-git/PKGBUILD
@@ -18,6 +18,9 @@ source=("git+https://github.com/renatosilva/colormake"
         "${_realname}.install")
 sha256sums=('SKIP'
             '77404b4ebad97738edabb6c8a1c1958cb73e28dedeed5a85a4e0ceaf1469fd73')
+msys2_references=(
+  'archlinux'
+)
 
 pkgver() {
     cd "${srcdir}/${_realname}"
diff --git a/editorconfig-vim/PKGBUILD b/editorconfig-vim/PKGBUILD
index 103a84cc..b7771826 100644
--- a/editorconfig-vim/PKGBUILD
+++ b/editorconfig-vim/PKGBUILD
@@ -12,6 +12,9 @@ depends=("vim")
 install=vimdoc.install
 source=("${pkgname}-${pkgver}.tar.gz::https://github.com/editorconfig/editorconfig-vim/archive/v${pkgver}.tar.gz")
 sha256sums=("eb8be206659e6fb3bab9df66fe9b80c14265325e3d9a4bbaad7c63058c2ba558")
+msys2_references=(
+  'archlinux: vim-editorconfig'
+)
 
 package() {
   mkdir -p ${pkgdir}/usr/share/vim/vimfiles/{plugin,doc,autoload}
diff --git a/filesystem/PKGBUILD b/filesystem/PKGBUILD
index c0ce30fa..6bfcf09f 100644
--- a/filesystem/PKGBUILD
+++ b/filesystem/PKGBUILD
@@ -12,6 +12,7 @@ license=('spdx:BSD-3-Clause')
 url='https://github.com/msys2/MSYS2-packages/tree/master/filesystem'
 provides=('msys2-base')
 replaces=('msys2-base')
+msys2_internal=true
 backup=('etc/fstab' 'etc/shells' 'etc/profile'
         etc/bash.bash{rc,_logout} etc/skel/.bash{rc,_profile,_logout}
         etc/nsswitch.conf)
diff --git a/git-flow/PKGBUILD b/git-flow/PKGBUILD
index 9843773b..cfc833f4 100644
--- a/git-flow/PKGBUILD
+++ b/git-flow/PKGBUILD
@@ -11,6 +11,9 @@ depends=('git' 'util-linux' 'make')
 url="https://github.com/petervanderdoes/gitflow-avh"
 source=("${_realname}"::"git+https://github.com/petervanderdoes/gitflow-avh.git#branch=master")
 sha256sums=('SKIP')
+msys2_references=(
+  'aur: gitflow-avh'
+)
 
 pkgver() {
   cd "${srcdir}/${_realname}"
diff --git a/glib2/PKGBUILD b/glib2/PKGBUILD
index 1d6b70e7..70a23708 100644
--- a/glib2/PKGBUILD
+++ b/glib2/PKGBUILD
@@ -25,6 +25,9 @@ source=(https://download.gnome.org/sources/glib/${pkgver%.*}/glib-$pkgver.tar.xz
 noextract=("glib-$pkgver.tar.xz")
 sha256sums=('ed3a9953a90b20da8e5578a79f7d1c8a532eacbe2adac82aa3881208db8a3abe'
             '31bce1aff2dab2262ea372d101081162a77e9310fe0d68400da8c85d698ce65e')
+msys2_references=(
+  'cygwin: glib2.0'
+)
 
 prepare() {
   bsdtar -zxf "glib-${pkgver}.tar.xz" || true
diff --git a/libcrypt/PKGBUILD b/libcrypt/PKGBUILD
index 1dd27c5f..0350279d 100644
--- a/libcrypt/PKGBUILD
+++ b/libcrypt/PKGBUILD
@@ -14,6 +14,9 @@ source=(${pkgbase}-${pkgver}::git+https://sourceware.org/git/cygwin-apps/crypt.g
         msysize.patch)
 sha256sums=('SKIP'
             'f0646267208c94d96cf07b6f90296b7c7211b7daa64cb85c6a80128ac3f6ebff')
+msys2_references=(
+  'cygwin: crypt'
+)
 
 prepare() {
   cd ${srcdir}/${pkgbase}-${pkgver}
diff --git a/libqrencode/PKGBUILD b/libqrencode/PKGBUILD
index 9147a52f..6589114d 100644
--- a/libqrencode/PKGBUILD
+++ b/libqrencode/PKGBUILD
@@ -14,6 +14,9 @@ license=('LGPL')
 makedepends=('gcc' 'autotools' 'libiconv-devel')
 source=("${pkgbase}-${pkgver}.tar.gz::https://github.com/fukuchi/libqrencode/archive/v${pkgver}.tar.gz")
 sha256sums=('5385bc1b8c2f20f3b91d258bf8ccc8cf62023935df2d2676b5b67049f31a049c')
+msys2_references=(
+  'archlinux: qrencode'
+)
 
 prepare() {
   cd ${srcdir}/${pkgbase}-${pkgver}
diff --git a/lzo2/PKGBUILD b/lzo2/PKGBUILD
index 6bb1b08f..6c845e3d 100644
--- a/lzo2/PKGBUILD
+++ b/lzo2/PKGBUILD
@@ -15,6 +15,9 @@ source=(https://www.oberhumer.com/opensource/lzo/download/lzo-${pkgver}.tar.gz
 options=(!libtool)
 sha256sums=('c0f892943208266f9b6543b3ae308fab6284c5c90e627931446fb49b4221a072'
             'bc144d5cc547dd0a7c0923130ef4de268a622f6eab6ebfc705d7b0ea87bfa401')
+msys2_references=(
+  'archlinux: lzo'
+)
 
 prepare() {
   cd "${srcdir}/lzo-${pkgver}"
diff --git a/mingw-w64-cross-binutils/PKGBUILD b/mingw-w64-cross-binutils/PKGBUILD
index 21ef1279..0b19fe63 100644
--- a/mingw-w64-cross-binutils/PKGBUILD
+++ b/mingw-w64-cross-binutils/PKGBUILD
@@ -24,6 +24,9 @@ sha256sums=('ae9a5789e23459e59606e6714723f2d3ffc31c03174191ef0d015bdf06007450'
             '4e8ac055df61b1b5d6ae29dc87e1154737c2e87c7b244b44866702cabf1a5d18')
 validpgpkeys=('EAF1C276A747E9ED86210CBAC3126D3B4AE55E93'
               '3A24BC1E8FB409FA9F14371813FCEF89DD9E3C4F')
+msys2_references=(
+  'archlinux: binutils'
+)
 
 _targets="i686-w64-mingw32 x86_64-w64-mingw32" # armv7-w64-mingw32
 
diff --git a/mingw-w64-cross-clang-crt/PKGBUILD b/mingw-w64-cross-clang-crt/PKGBUILD
index 5d44550a..13ff4753 100644
--- a/mingw-w64-cross-clang-crt/PKGBUILD
+++ b/mingw-w64-cross-clang-crt/PKGBUILD
@@ -17,6 +17,9 @@ options=('!strip' 'staticlibs' '!emptydirs' '!buildflags')
 _commit='1c773877f4a13c8bd7bfb8da80e1e8761a889f51'
 source=("mingw-w64"::"git+https://git.code.sf.net/p/mingw-w64/mingw-w64#commit=$_commit")
 sha256sums=('SKIP')
+msys2_references=(
+  'archlinux: mingw-w64-crt'
+)
 
 _targets="x86_64-w64-mingw32 i686-w64-mingw32 armv7-w64-mingw32 aarch64-w64-mingw32"
 
diff --git a/mingw-w64-cross-clang-headers/PKGBUILD b/mingw-w64-cross-clang-headers/PKGBUILD
index bb0d0189..d2c69124 100644
--- a/mingw-w64-cross-clang-headers/PKGBUILD
+++ b/mingw-w64-cross-clang-headers/PKGBUILD
@@ -16,6 +16,9 @@ options=('!strip' '!libtool' '!emptydirs' '!buildflags')
 _commit='1c773877f4a13c8bd7bfb8da80e1e8761a889f51'
 source=("mingw-w64"::"git+https://git.code.sf.net/p/mingw-w64/mingw-w64#commit=$_commit")
 sha256sums=('SKIP')
+msys2_references=(
+  'archlinux: mingw-w64-headers'
+)
 
 _targets="i686-w64-mingw32 x86_64-w64-mingw32 armv7-w64-mingw32 aarch64-w64-mingw32"
 
diff --git a/mingw-w64-cross-clang/PKGBUILD b/mingw-w64-cross-clang/PKGBUILD
index e20b36c4..833d2688 100644
--- a/mingw-w64-cross-clang/PKGBUILD
+++ b/mingw-w64-cross-clang/PKGBUILD
@@ -13,6 +13,9 @@ license=('custom:Apache 2.0 with LLVM Exception')
 depends=('mingw-w64-cross-clang-crt' 'mingw-w64-cross-compiler-rt')
 makedepends=("clang" "cmake" "lld")
 options=('!strip' 'staticlibs' '!emptydirs' '!buildflags')
+msys2_references=(
+  'archlinux: clang'
+)
 _url=https://github.com/llvm/llvm-project/releases/download/llvmorg-${pkgver}
 source=(${_url}/llvm-${pkgver}.src.tar.xz{,.sig}
         ${_url}/libcxx-${pkgver}.src.tar.xz{,.sig}
diff --git a/mingw-w64-cross-compiler-rt/PKGBUILD b/mingw-w64-cross-compiler-rt/PKGBUILD
index 1619bca5..a5c64001 100644
--- a/mingw-w64-cross-compiler-rt/PKGBUILD
+++ b/mingw-w64-cross-compiler-rt/PKGBUILD
@@ -9,6 +9,9 @@ pkgdesc="Compiler runtime libraries for cross clang"
 arch=('i686' 'x86_64')
 url="https://llvm.org"
 license=('custom:Apache 2.0 with LLVM Exception')
+msys2_references=(
+  'archlinux: compiler-rt'
+)
 depends=('clang')
 makedepends=("cmake" "lld" "ninja" "${_mingw_suff}-clang-headers" 'gcc')
 options=('!strip' 'staticlibs' '!emptydirs' '!buildflags')
diff --git a/mingw-w64-cross-crt/PKGBUILD b/mingw-w64-cross-crt/PKGBUILD
index 643e8f73..07596dd3 100644
--- a/mingw-w64-cross-crt/PKGBUILD
+++ b/mingw-w64-cross-crt/PKGBUILD
@@ -21,6 +21,9 @@ _commit='c3e587c067a00a561899d49d3e63a659e38802ec'
 source=("mingw-w64"::"git+https://git.code.sf.net/p/mingw-w64/mingw-w64#commit=$_commit")
 
 sha256sums=('SKIP')
+msys2_references=(
+  'archlinux: mingw-w64-crt'
+)
 
 _targets="x86_64-w64-mingw32 i686-w64-mingw32" #armv7-w64-mingw32
 
diff --git a/mingw-w64-cross-gcc/PKGBUILD b/mingw-w64-cross-gcc/PKGBUILD
index 90ce5abf..e27b956c 100644
--- a/mingw-w64-cross-gcc/PKGBUILD
+++ b/mingw-w64-cross-gcc/PKGBUILD
@@ -9,6 +9,9 @@ pkgdesc="Cross GCC for the MinGW-w64"
 arch=('i686' 'x86_64')
 url="https://gcc.gnu.org"
 license=('GPL' 'LGPL' 'FDL' 'custom')
+msys2_references=(
+  'archlinux: gcc'
+)
 groups=("${_mingw_suff}-toolchain" "${_mingw_suff}")
 depends=("zlib" "mpc" "isl"
          "${_mingw_suff}-binutils"
diff --git a/mingw-w64-cross-headers/PKGBUILD b/mingw-w64-cross-headers/PKGBUILD
index 4055d27f..cd4f9921 100644
--- a/mingw-w64-cross-headers/PKGBUILD
+++ b/mingw-w64-cross-headers/PKGBUILD
@@ -19,6 +19,9 @@ options=('!strip' '!libtool' '!emptydirs' '!buildflags')
 _commit='c3e587c067a00a561899d49d3e63a659e38802ec'
 source=("mingw-w64"::"git+https://git.code.sf.net/p/mingw-w64/mingw-w64#commit=$_commit")
 sha256sums=('SKIP')
+msys2_references=(
+  'archlinux: mingw-w64-headers'
+)
 
 _targets="i686-w64-mingw32 x86_64-w64-mingw32 armv7-w64-mingw32"
 
diff --git a/mingw-w64-cross-tools/PKGBUILD b/mingw-w64-cross-tools/PKGBUILD
index ae5c67a6..ebc4c9d4 100644
--- a/mingw-w64-cross-tools/PKGBUILD
+++ b/mingw-w64-cross-tools/PKGBUILD
@@ -19,6 +19,10 @@ options=('!strip' '!libtool' '!emptydirs' '!buildflags')
 _commit='c3e587c067a00a561899d49d3e63a659e38802ec'
 source=("mingw-w64"::"git+https://git.code.sf.net/p/mingw-w64/mingw-w64#commit=$_commit")
 sha256sums=('SKIP')
+msys2_references=(
+  # doesn't exist in arch, this is the next best thing
+  'archlinux: mingw-w64-headers'
+)
 _tools="gendef genlib genidl genpeimg" #widl
 
 _targets="i686-w64-mingw32 x86_64-w64-mingw32" #armv7-w64-mingw32
diff --git a/mingw-w64-cross-ucrt-crt/PKGBUILD b/mingw-w64-cross-ucrt-crt/PKGBUILD
index b017538e..ec433f89 100644
--- a/mingw-w64-cross-ucrt-crt/PKGBUILD
+++ b/mingw-w64-cross-ucrt-crt/PKGBUILD
@@ -17,6 +17,9 @@ options=('!strip' 'staticlibs' '!emptydirs' '!buildflags')
 _commit='1c773877f4a13c8bd7bfb8da80e1e8761a889f51'
 source=("mingw-w64"::"git+https://git.code.sf.net/p/mingw-w64/mingw-w64#commit=$_commit")
 sha256sums=('SKIP')
+msys2_references=(
+  'archlinux: mingw-w64-crt'
+)
 
 _targets="x86_64-w64-mingw32 i686-w64-mingw32" #armv7-w64-mingw32
 
diff --git a/mingw-w64-cross-ucrt-headers/PKGBUILD b/mingw-w64-cross-ucrt-headers/PKGBUILD
index 85da4c59..e893f944 100644
--- a/mingw-w64-cross-ucrt-headers/PKGBUILD
+++ b/mingw-w64-cross-ucrt-headers/PKGBUILD
@@ -16,6 +16,9 @@ options=('!strip' '!libtool' '!emptydirs' '!buildflags')
 _commit='1c773877f4a13c8bd7bfb8da80e1e8761a889f51'
 source=("mingw-w64"::"git+https://git.code.sf.net/p/mingw-w64/mingw-w64#commit=$_commit")
 sha256sums=('SKIP')
+msys2_references=(
+  'archlinux: mingw-w64-headers'
+)
 
 _targets="i686-w64-mingw32 x86_64-w64-mingw32 armv7-w64-mingw32"
 
diff --git a/mingw-w64-cross-windows-default-manifest/PKGBUILD b/mingw-w64-cross-windows-default-manifest/PKGBUILD
index 9de4edff..90119ee7 100644
--- a/mingw-w64-cross-windows-default-manifest/PKGBUILD
+++ b/mingw-w64-cross-windows-default-manifest/PKGBUILD
@@ -16,6 +16,9 @@ source=("git://sourceware.org/git/cygwin-apps/${_realname}.git#tag=${_GIT_TAG}"
         001-msysize.patch)
 sha256sums=('SKIP'
             '0baef1e5f9b980cdf730386a652b6b02ba6b675cc120ad67c7c15e6a88050e0f')
+msys2_references=(
+  'cygwin: windows-default-manifest'
+)
 
 _targets="i686-w64-mingw32 x86_64-w64-mingw32"
 
diff --git a/mingw-w64-cross-winpthreads/PKGBUILD b/mingw-w64-cross-winpthreads/PKGBUILD
index 22a79b16..f2409a5c 100644
--- a/mingw-w64-cross-winpthreads/PKGBUILD
+++ b/mingw-w64-cross-winpthreads/PKGBUILD
@@ -23,6 +23,9 @@ source=("mingw-w64"::"git+https://git.code.sf.net/p/mingw-w64/mingw-w64#commit=$
         0001-Define-__-de-register_frame_info-in-fake-libgcc_s.patch)
 sha256sums=('SKIP'
             'd9e8af81682d9bf70e3d87506f51156cec61260b810a234bce861cb2eb3a5919')
+msys2_references=(
+  'archlinux: mingw-w64-winpthreads'
+)
 
 _targets="i686-w64-mingw32 x86_64-w64-mingw32"
 
diff --git a/mingw-w64-cross-winstorecompat/PKGBUILD b/mingw-w64-cross-winstorecompat/PKGBUILD
index 4b3f9d0a..0e51d670 100644
--- a/mingw-w64-cross-winstorecompat/PKGBUILD
+++ b/mingw-w64-cross-winstorecompat/PKGBUILD
@@ -21,6 +21,10 @@ options=('!strip' '!buildflags' 'staticlibs' '!emptydirs' '!buildflags')
 _commit='c3e587c067a00a561899d49d3e63a659e38802ec'
 source=("mingw-w64"::"git+https://git.code.sf.net/p/mingw-w64/mingw-w64#commit=$_commit")
 sha256sums=('SKIP')
+msys2_references=(
+  # doesn't exist in arch, this is the next best thing
+  'archlinux: mingw-w64-headers'
+)
 
 _targets="i686-w64-mingw32 x86_64-w64-mingw32"
 
diff --git a/mingw-w64-cross-zlib/PKGBUILD b/mingw-w64-cross-zlib/PKGBUILD
index b0f131ff..0698ce09 100644
--- a/mingw-w64-cross-zlib/PKGBUILD
+++ b/mingw-w64-cross-zlib/PKGBUILD
@@ -21,6 +21,9 @@ sha256sums=('c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1'
             'ac91f905b695d71f6c9c471ac98c14a3ed989a1e2b2a3b1171b3f6dc6bfc31b4'
             '44e23000cc4cb7502f303aa252be17ffee66384fe76a66607dc1f4df0a815030'
             '3d039f42194aade91dadf4174f55fd6db349fd8044db93875bed1042dcfe1f31')
+msys2_references=(
+  'archlinux: zlib'
+)
 
 _targets="i686-w64-mingw32 x86_64-w64-mingw32"
 
diff --git a/mpc/PKGBUILD b/mpc/PKGBUILD
index 4c284155..6c7275ce 100644
--- a/mpc/PKGBUILD
+++ b/mpc/PKGBUILD
@@ -15,7 +15,9 @@ source=(https://ftp.gnu.org/gnu/mpc/mpc-${pkgver}.tar.gz{,.sig})
 sha256sums=('ab642492f5cf882b74aa0cb730cd410a81edcdbec895183ce930e706c1c759b8'
             'SKIP')
 validpgpkeys=('AD17A21EF8AED8F1CC02DBD9F7D5C9BF765C61E3')  # Andreas Enge
-
+msys2_references=(
+  'archlinux: libmpc'
+)
 
 prepare() {
   cd "${srcdir}/${pkgname}-${pkgver}"
diff --git a/msys2-keyring/PKGBUILD b/msys2-keyring/PKGBUILD
index 2cc0e7c6..fb6f768a 100644
--- a/msys2-keyring/PKGBUILD
+++ b/msys2-keyring/PKGBUILD
@@ -11,6 +11,7 @@ license=('GPL')
 install="${pkgname}.install"
 source=("https://github.com/msys2/MSYS2-keyring/archive/${pkgver}.tar.gz")
 sha256sums=('fb886aa274a55878ed09c33027ec5706cb7c047d26d995c5413fdad400573c4f')
+msys2_internal=true
 
 package() {
   cd "MSYS2-keyring-${pkgver}"
diff --git a/msys2-launcher/PKGBUILD b/msys2-launcher/PKGBUILD
index 58cb8899..fee3d56c 100644
--- a/msys2-launcher/PKGBUILD
+++ b/msys2-launcher/PKGBUILD
@@ -14,6 +14,7 @@ depends=("mintty>=1~2.2.1")
 makedepends=('mingw-w64-cross-gcc')
 source=("https://github.com/msys2/msys2-launcher/archive/v${pkgver}.tar.gz")
 sha256sums=('bd0552417efd04e5c46c2c7009181d72fac0380e99f43d4b2633a505f147f773')
+msys2_internal=true
 
 build() {
   cd "msys2-launcher-${pkgver}"
diff --git a/msys2-runtime/PKGBUILD b/msys2-runtime/PKGBUILD
index 70f1247d..8e4f76a6 100644
--- a/msys2-runtime/PKGBUILD
+++ b/msys2-runtime/PKGBUILD
@@ -9,6 +9,9 @@ pkgdesc="Cygwin POSIX emulation engine"
 arch=('x86_64')
 url="https://www.cygwin.com/"
 license=('GPL')
+msys2_references=(
+  'cygwin: cygwin'
+)
 makedepends=('cocom'
              'git'
              'perl'
diff --git a/msys2-w32api-headers/PKGBUILD b/msys2-w32api-headers/PKGBUILD
index 92c910cf..c58549c5 100644
--- a/msys2-w32api-headers/PKGBUILD
+++ b/msys2-w32api-headers/PKGBUILD
@@ -13,6 +13,9 @@ options=('staticlibs' '!buildflags')
 _commit='c3e587c067a00a561899d49d3e63a659e38802ec'
 source=("mingw-w64"::"git+https://git.code.sf.net/p/mingw-w64/mingw-w64#commit=$_commit")
 sha256sums=('SKIP')
+msys2_references=(
+  'cygwin: w32api-runtime'
+)
 
 pkgver() {
   cd "${srcdir}/mingw-w64"
diff --git a/msys2-w32api-runtime/PKGBUILD b/msys2-w32api-runtime/PKGBUILD
index 18f91ec2..8b7f27fb 100644
--- a/msys2-w32api-runtime/PKGBUILD
+++ b/msys2-w32api-runtime/PKGBUILD
@@ -13,6 +13,9 @@ makedepends=('git' 'mingw-w64-cross-gcc' 'autotools')
 _commit='c3e587c067a00a561899d49d3e63a659e38802ec'
 source=('mingw-w64'::"git+https://git.code.sf.net/p/mingw-w64/mingw-w64#commit=$_commit")
 sha256sums=('SKIP')
+msys2_references=(
+  'cygwin: w32api-runtime'
+)
 
 pkgver() {
   cd "${srcdir}/mingw-w64"
diff --git a/pacman-mirrors/PKGBUILD b/pacman-mirrors/PKGBUILD
index a4b4a03e..9abf8786 100644
--- a/pacman-mirrors/PKGBUILD
+++ b/pacman-mirrors/PKGBUILD
@@ -20,6 +20,8 @@ backup=(
   'etc/pacman.d/mirrorlist.clang64'
   'etc/pacman.d/mirrorlist.clang32'
 )
+msys2_internal=true
+
 package() {
   mkdir -p ${pkgdir}/etc/pacman.d
   install -m644 ${srcdir}/mirrorlist.msys ${pkgdir}/etc/pacman.d/
diff --git a/perl-Algorithm-Diff/PKGBUILD b/perl-Algorithm-Diff/PKGBUILD
index d6d71b8c..79f8937f 100644
--- a/perl-Algorithm-Diff/PKGBUILD
+++ b/perl-Algorithm-Diff/PKGBUILD
@@ -13,6 +13,9 @@ depends=('perl')
 license=('GPL' 'PerlArtistic')
 source=("https://cpan.metacpan.org/authors/id/R/RJ/RJBS/${_realname}-${pkgver}.tar.gz")
 sha256sums=('0022da5982645d9ef0207f3eb9ef63e70e9713ed2340ed7b3850779b0d842a7d')
+msys2_references=(
+  'cygwin'
+)
 
 build() {
   cd ${_realname}-${pkgver}
diff --git a/perl-TermReadKey/PKGBUILD b/perl-TermReadKey/PKGBUILD
index c68463ed..f66f3d1f 100644
--- a/perl-TermReadKey/PKGBUILD
+++ b/perl-TermReadKey/PKGBUILD
@@ -14,6 +14,9 @@ groups=('perl-modules')
 options=('!emptydirs')
 source=(https://www.cpan.org/authors/id/J/JS/JSTOWE/${_realname}-${pkgver}.tar.gz)
 sha256sums=('5a645878dc570ac33661581fbb090ff24ebce17d43ea53fd22e105a856a47290')
+msys2_references=(
+  'archlinux: perl-term-readkey'
+)
 
 build() {
   cd "${srcdir}/${_realname}-${pkgver}"
diff --git a/perl-ack/PKGBUILD b/perl-ack/PKGBUILD
index a9d53203..0e54cdfc 100644
--- a/perl-ack/PKGBUILD
+++ b/perl-ack/PKGBUILD
@@ -16,6 +16,10 @@ source=("https://www.cpan.org/authors/id/P/PE/PETDANCE/${_realname}-v${pkgver}.t
         '0002-ack-2.12-match-makefiles-with-more-generality.patch')
 sha256sums=('ea7caa14f757de083310ed2cba298661ddcca5dee06ec8f18043ea625a79df20'
             '3f2bec65a174465babb5fef6c179ae25b7d85bee2263683396b574c3d3d33cab')
+msys2_references=(
+  'archlinux: ack'
+)
+
 prepare() {
   cd "${srcdir}/${_realname}-v${pkgver}"
   patch -p1 -i ${srcdir}/0002-ack-2.12-match-makefiles-with-more-generality.patch
diff --git a/python-mallard-ducktype/PKGBUILD b/python-mallard-ducktype/PKGBUILD
index 85445cd4..a96eebad 100644
--- a/python-mallard-ducktype/PKGBUILD
+++ b/python-mallard-ducktype/PKGBUILD
@@ -18,6 +18,9 @@ makedepends=(
 )
 source=("${_realname}-$pkgver.tar.gz"::"https://github.com/projectmallard/mallard-ducktype/archive/${pkgver}.tar.gz")
 sha256sums=('73ac416376dd65c737594ab4b1037b0823390239f33672f1ee1e30725dcef4e9')
+msys2_references=(
+  'archlinux: mallard-ducktype'
+)
 
 build() {
   cd "${_realname}-${pkgver}"
diff --git a/python-pyalpm/PKGBUILD b/python-pyalpm/PKGBUILD
index 2faa1d38..5aad38ba 100644
--- a/python-pyalpm/PKGBUILD
+++ b/python-pyalpm/PKGBUILD
@@ -30,6 +30,9 @@ source=("git+https://gitlab.archlinux.org/archlinux/pyalpm.git#tag=${pkgver}"
         "0005-Use-pkg-config-add-LIBALPM_STATIC-env.-var.patch")
 sha256sums=('SKIP'
             'e26201c95cf6511cc884a38a8ca17cd61154542c390bcd8f7484bdc8e560cee9')
+msys2_references=(
+  'archlinux: pyalpm'
+)
 
 prepare() {
   cd "${srcdir}/${_realname}"
diff --git a/tzcode/PKGBUILD b/tzcode/PKGBUILD
index 7009ee48..174d82c1 100644
--- a/tzcode/PKGBUILD
+++ b/tzcode/PKGBUILD
@@ -22,6 +22,9 @@ sha256sums=('3f510b5d1b4ae9bb38e485aa302a776b317fb3637bdb6404c4adf7b6cadd965c'
             'a118e7b535bd21d494b9f3837a13939a0c826c0c6859dd8702a5256b898ad51a'
             'faf73eb5f07c56b019b540005f4262f33927a4ff2acf3752a055e8530decd749')
 validpgpkeys=('7E3792A9D8ACF7D633BC1588ED97E90E62AA7E34') # Paul Eggert <eggert@cs.ucla.edu>
+msys2_references=(
+  'archlinux: tzdata'
+)
 
 _timezones=('africa' 'antarctica' 'asia' 'australasia'
            'europe' 'northamerica' 'southamerica'
diff --git a/u-boot-tools/PKGBUILD b/u-boot-tools/PKGBUILD
index 9c5d51a9..6539a55f 100644
--- a/u-boot-tools/PKGBUILD
+++ b/u-boot-tools/PKGBUILD
@@ -14,6 +14,9 @@ noextract=("u-boot-${pkgver}.tar.bz2")
 sha256sums=('12e921b466ae731cdbc355e6832b7f22bc90b01aeceef9886f98aaba7b394300'
             'SKIP')
 validpgpkeys=('1A3C7F70E08FAB1707809BBF147C39FF9634B72C')
+msys2_references=(
+  'archlinux: uboot-tools'
+)
 
 prepare() {
   # workaround an issue of bsdtar for extracting symbolic links in the tarball