assignUser commented on code in PR #37684:
URL: https://github.com/apache/arrow/pull/37684#discussion_r1343080206


##########
r/tools/nixlibs.R:
##########
@@ -191,33 +202,50 @@ test_for_curl_and_openssl <- "
 #if OPENSSL_VERSION_NUMBER >= 0x30000000L
 #error Using OpenSSL version 3
 #endif
-"
+")
 
 compile_test_program <- function(code) {
-  # Note: if we wanted to check for openssl on macOS, we'd have to set the brew
-  # path as a -I directory. But since we (currently) only run this code to
-  # determine whether we can download a Linux binary, it's not relevant.
+  openssl_dir <- ""
+  if(on_macos) {
+    openssl_root_dir <- get_macos_openssl_dir()
+    openssl_dir <- paste0("-I", openssl_root_dir, "/include")
+  }
   runner <- paste(
     R_CMD_config("CXX17"),
+    openssl_dir,
     R_CMD_config("CPPFLAGS"),
     R_CMD_config("CXX17FLAGS"),
     R_CMD_config("CXX17STD"),
     "-E",
-    "-xc++"
-  )
+    "-xc++"  )
   suppressWarnings(system2("echo", sprintf('"%s" | %s -', code, runner), 
stdout = FALSE, stderr = TRUE))
 }
 
+get_macos_openssl_dir <- function(){
+  openssl_root_dir <- Sys.getenv("OPENSSL_ROOT_DIR", NA)
+  if (is.na(openssl_root_dir)) {
+    # try to guess default openssl include dir based on CRAN's build script
+    # https://github.com/R-macos/recipes/blob/master/build.sh#L35
+    if(identical(Sys.info()["machine"], "arm64")){
+          openssl_root_dir <- "/opt/R/arm64"
+    } else if (file.exists("/opt/R/x86_64")) {
+      openssl_root_dir <- "/opt/R/x86_64"
+    } else {
+      openssl_root_dir <- "/usr/local"
+    }
+  }
+  return(openssl_root_dir)

Review Comment:
   The configure script looks for homebrew headers and creates the envvar if 
the prefix exists, so that case is handled.



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