karldw commented on a change in pull request #11001:
URL: https://github.com/apache/arrow/pull/11001#discussion_r696784693



##########
File path: r/tools/nixlibs.R
##########
@@ -329,18 +288,22 @@ build_libarrow <- function(src_dir, dst_dir) {
     LDFLAGS = R_CMD_config("LDFLAGS")
   )
   env_vars <- paste0(names(env_var_list), '="', env_var_list, '"', collapse = 
" ")
+  # Add env variables like ARROW_S3=ON. Order doesn't matter. Depends on 
`download_ok`
   env_vars <- with_s3_support(env_vars)
   env_vars <- with_mimalloc(env_vars)
-  if (tolower(Sys.info()[["sysname"]]) %in% "sunos") {
-    # jemalloc doesn't seem to build on Solaris
-    # nor does thrift, so turn off parquet,
-    # and arrowExports.cpp requires parquet for dataset (ARROW-11994), so turn 
that off
-    # xsimd doesn't compile, so set SIMD level to NONE to skip it
-    # re2 and utf8proc do compile,
-    # but `ar` fails to build libarrow_bundled_dependencies, so turn them off
-    # so that there are no bundled deps
-    env_vars <- paste(env_vars, "ARROW_JEMALLOC=OFF ARROW_PARQUET=OFF 
ARROW_DATASET=OFF ARROW_WITH_RE2=OFF ARROW_WITH_UTF8PROC=OFF 
EXTRA_CMAKE_FLAGS=-DARROW_SIMD_LEVEL=NONE")
-  }
+  env_vars <- with_jemalloc(env_vars)

Review comment:
       > it kinda feels like we're reimplementing cmake here, and there's lots 
of subtleties that we can get wrong
   
   Yeah....
   
   -----------------
   
   It makes sense to just point to the directory! A couple of thoughts about 
implementation:
   - Should this have an Arrow-specific name, like 
`ARROW_THIRDPARTY_DEPENDENCIES`?
   - The files in that directory have names like 
`<component>-<version>.tar.gz`. To create the `*_SOURCE_URL`, I'll search for 
the component name, and raise an error if I find 0 or >1 matches?
   - If  `*_SOURCE_URL` is set already, I'll use that value instead of looking 
in the directory
   
   I noticed solaris doesn't turn json off. I'm not really sure how things work 
there.




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