From efb58f750295ae918ab56fd2a2382270814b11cc Mon Sep 17 00:00:00 2001
From: Jeroen Ooms <jeroenooms@gmail.com>
Date: Fri, 6 Oct 2023 12:25:22 +0200
Subject: [PATCH] Windows: switch to toolchain libs for UCRT (#170)

---
 .github/workflows/R-CMD-check.yaml | 7 ++-----
 NEWS.md                            | 2 ++
 src/Makevars.ucrt                  | 3 +--
 3 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index ee65ccb..16ef516 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -23,13 +23,9 @@ jobs:
       matrix:
         config:
           - {os: macos-latest,   r: 'release'}
-
           - {os: windows-latest, r: 'release'}
-          # Use 3.6 to trigger usage of RTools35
-          - {os: windows-latest, r: '3.6'}
-          # use 4.1 to check with rtools40's older compiler
+          - {os: windows-latest, r: '4.2', rtools: '42'}
           - {os: windows-latest, r: '4.1'}
-
           - {os: ubuntu-latest,   r: 'devel', http-user-agent: 'release'}
           - {os: ubuntu-latest,   r: 'release'}
           - {os: ubuntu-latest,   r: 'oldrel-1'}
@@ -49,6 +45,7 @@ jobs:
       - uses: r-lib/actions/setup-r@v2
         with:
           r-version: ${{ matrix.config.r }}
+          rtools-version: ${{ matrix.config.rtools }}
           http-user-agent: ${{ matrix.config.http-user-agent }}
           use-public-rspm: true
 
diff --git a/NEWS.md b/NEWS.md
index 07a0d16..df95b42 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,7 @@
 # svglite (development version)
 
+* Windows: use libpng included with Rtools on R 4.2 and up.
+
 # svglite 2.1.1
 
 * Fix `<cstdint>` include at request of CRAN
diff --git a/src/Makevars.ucrt b/src/Makevars.ucrt
index 1a2e101..2ac7d52 100644
--- a/src/Makevars.ucrt
+++ b/src/Makevars.ucrt
@@ -1,2 +1 @@
-CRT=-ucrt
-include Makevars.win
+PKG_LIBS = -lpng -lz