add macos system dependencies

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

@@ -47,6 +47,25 @@ jobs:
 
       - uses: r-lib/actions/setup-pandoc@master
 
+      - name: Brew and macOS config
+        if: runner.os == 'macOS'
+        run: |
+          brew install pkg-config
+          brew install udunits
+          brew install gdal
+          cat <<EOT >> .Renviron
+          PKG_CONFIG_PATH=/usr/local/lib/pkgconfig/
+          PROJ_LIB=/usr/local/opt/proj/share/proj/
+          # for installing XML package from source
+          XML_CONFIG=/usr/local/opt/libxml2/bin/xml2-config
+          EOT
+          cat <<EOT >> .Rprofile
+          config_args <- c("sf" = "--with-proj-lib=/usr/local/lib/", "rgdal" = "--with-proj-lib=/usr/local/lib/ --with-proj-include=/usr/local/include/")
+          r <- getOption("repos")
+          r["CRAN"] <- "https://cran.rstudio.com"
+          options(configure.args = config_args, repos = r)
+          EOT
+
       - name: Query dependencies
         run: |
           install.packages('remotes')