From 9c2bf54413d403d8a6a9895caad356ada9b2281e Mon Sep 17 00:00:00 2001
From: Theodore Tsirpanis <teo@tsirpanis.gr>
Date: Fri, 12 Dec 2025 21:47:47 +0200
Subject: [PATCH 1/3] Use rtools 4.3.

---
 .../{build-rtools40.yml => build-rtools.yml}          | 11 ++++++-----
 .github/workflows/full-ci.yml                         |  2 +-
 .github/workflows/release.yml                         |  2 +-
 3 files changed, 8 insertions(+), 7 deletions(-)
 rename .github/workflows/{build-rtools40.yml => build-rtools.yml} (93%)

diff --git a/.github/workflows/build-rtools40.yml b/.github/workflows/build-rtools.yml
similarity index 93%
rename from .github/workflows/build-rtools40.yml
rename to .github/workflows/build-rtools.yml
index 704159c685c..284ce57c7e5 100644
--- a/.github/workflows/build-rtools40.yml
+++ b/.github/workflows/build-rtools.yml
@@ -1,4 +1,4 @@
-name: rtools40
+name: rtools
 on:
   workflow_call:
 
@@ -32,9 +32,10 @@ jobs:
           ref: ${{ steps.vcpkg_commit.outputs.ref }}
           # Vcpkg requires fetching all commits.
           fetch-depth: 0
-      - name: Install rtools40 if needed
-        uses: r-windows/install-rtools@master
-      - name: Building TileDB with Rtools40
+      - uses: r-lib/actions/setup-r@v2
+        with:
+          r-version: '4.3'
+      - name: Build TileDB
         run: |
           export SystemDrive="$SYSTEMDRIVE"
           export SystemRoot="$SYSTEMROOT"
@@ -46,7 +47,7 @@ jobs:
           TILEDB_HOME: ${{ github.workspace }}
           MINGW_ARCH: ${{ matrix.msystem }}
           VCPKG_ROOT: ${{ github.workspace }}/vcpkg
-        shell: c:\rtools40\usr\bin\bash.exe --login {0}
+        shell: c:\rtools43\usr\bin\bash.exe --login {0}
       - name: Set variables
         shell: bash
         id: get-values
diff --git a/.github/workflows/full-ci.yml b/.github/workflows/full-ci.yml
index 35b4be48be5..62b9f771a1e 100644
--- a/.github/workflows/full-ci.yml
+++ b/.github/workflows/full-ci.yml
@@ -122,7 +122,7 @@ jobs:
     uses: ./.github/workflows/build-windows.yml
 
   ci_mingw_r:
-    uses: ./.github/workflows/build-rtools40.yml
+    uses: ./.github/workflows/build-rtools.yml
 
   backward_compatibility:
     uses: ./.github/workflows/build-backwards-compatibility.yml
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 3561af20cd1..fec7b99045d 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -46,7 +46,7 @@ jobs:
       version: ''
 
   Build-R-Binaries:
-    uses: ./.github/workflows/build-rtools40.yml
+    uses: ./.github/workflows/build-rtools.yml
 
   Test-Release-Artifacts:
     needs:

From 56d22df210ec11fb5c42d1639ec6d9e20e9b03f8 Mon Sep 17 00:00:00 2001
From: Theodore Tsirpanis <teo@tsirpanis.gr>
Date: Tue, 16 Dec 2025 11:22:15 +0200
Subject: [PATCH 2/3] Install necessary dependencies.

---
 .github/workflows/build-rtools.yml | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/build-rtools.yml b/.github/workflows/build-rtools.yml
index 284ce57c7e5..9fefa05b603 100644
--- a/.github/workflows/build-rtools.yml
+++ b/.github/workflows/build-rtools.yml
@@ -35,13 +35,16 @@ jobs:
       - uses: r-lib/actions/setup-r@v2
         with:
           r-version: '4.3'
+      - name: Install RTools dependencies
+        run: |
+          pacman -Sy --noconfirm base-devel
+        shell: c:\rtools43\usr\bin\bash.exe --login {0}
       - name: Build TileDB
         run: |
           export SystemDrive="$SYSTEMDRIVE"
           export SystemRoot="$SYSTEMROOT"
           export windir="$WINDIR"
           cd ${GITHUB_WORKSPACE}/.github/workflows/mingw-w64-tiledb
-          pacman -Sy
           makepkg-mingw --noconfirm --syncdeps
         env:
           TILEDB_HOME: ${{ github.workspace }}

From 33e1553440463bc1e636c677664ffbd0b4f5edd5 Mon Sep 17 00:00:00 2001
From: Theodore Tsirpanis <teo@tsirpanis.gr>
Date: Tue, 16 Dec 2025 16:26:24 +0200
Subject: [PATCH 3/3] Fix artifact name.

---
 .github/workflows/build-rtools.yml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/build-rtools.yml b/.github/workflows/build-rtools.yml
index 9fefa05b603..a01703471b3 100644
--- a/.github/workflows/build-rtools.yml
+++ b/.github/workflows/build-rtools.yml
@@ -61,8 +61,8 @@ jobs:
       - name: "Rename release artifact and create sha256 hash"
         run: |
           mkdir release
-          mv .github/workflows/mingw-w64-tiledb/*.pkg.tar.xz release/tiledb-windows-x86_64-mingw64_ucrt64-${{ steps.get-values.outputs.release_version }}.tar.xz
-          sha256sum release/tiledb-windows-x86_64-mingw64_ucrt64-${{ steps.get-values.outputs.release_version }}.tar.xz > release/tiledb-windows-x86_64-mingw64_ucrt64-${{ steps.get-values.outputs.release_version }}.tar.xz.sha256
+          mv .github/workflows/mingw-w64-tiledb/*.pkg.tar.zst release/tiledb-windows-x86_64-mingw64_ucrt64-${{ steps.get-values.outputs.release_version }}.tar.zst
+          sha256sum release/tiledb-windows-x86_64-mingw64_ucrt64-${{ steps.get-values.outputs.release_version }}.tar.zst > release/tiledb-windows-x86_64-mingw64_ucrt64-${{ steps.get-values.outputs.release_version }}.tar.zst.sha256
       - name: "Upload binaries"
         uses: actions/upload-artifact@v4
         with: