Update R-CMD-check.yaml

add macos install dependencies

Author: dsass1

.github/workflows/R-CMD-check.yaml

@@ -24,7 +24,7 @@ jobs:
 
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
-      R_KEEP_PKG_SOURCE: no
+      R_KEEP_PKG_SOURCE: yes
     steps:
       - uses: actions/checkout@v4
 
@@ -42,6 +42,12 @@ jobs:
           sudo apt-get install -y libproj-dev
           sudo apt-get install -y libgdal-dev
 
+      - name: Install system dependencies (macOS)
+        if: runner.os == 'macOS'
+        run: |
+          brew install gettext
+          brew link --force gettext
+
       - uses: r-lib/actions/setup-r@v2
         with:
           use-public-rspm: true