trying a simple ignore

R-package/.Rbuildignore

@@ -14,7 +14,7 @@
 ^src/CMakeLists.txt$
 
 # unnecessary files from submodules
-^src/build/.git$
+^src/build/Makefile$
 ^src/compute/.appveyor.yml$
 ^src/compute/.coveralls.yml$
 ^src/compute/.travis.yml$

R-package/src/install.libs.R

@@ -103,27 +103,27 @@ if (!use_precompile) {
   # R CMD check complains about the .NOTPARALLEL directive created in the cmake
   # Makefile. We don't need it here anyway since targets are built serially, so trying
   # to remove it with this hack
-  generated_makefile <- file.path(
-    R_PACKAGE_SOURCE
-    , "src"
-    , "build"
-    , "Makefile"
-  )
-  if (file.exists(generated_makefile)) {
-    makefile_txt <- readLines(
-      con = generated_makefile
-    )
-    makefile_txt <- gsub(
-      pattern = ".*NOTPARALLEL.*"
-      , replacement = ""
-      , x = makefile_txt
-    )
-    writeLines(
-      text = makefile_txt
-      , con = generated_makefile
-      , sep = "\n"
-    )
-  }
+  # generated_makefile <- file.path(
+  #   R_PACKAGE_SOURCE
+  #   , "src"
+  #   , "build"
+  #   , "Makefile"
+  # )
+  # if (file.exists(generated_makefile)) {
+  #   makefile_txt <- readLines(
+  #     con = generated_makefile
+  #   )
+  #   makefile_txt <- gsub(
+  #     pattern = ".*NOTPARALLEL.*"
+  #     , replacement = ""
+  #     , x = makefile_txt
+  #   )
+  #   writeLines(
+  #     text = makefile_txt
+  #     , con = generated_makefile
+  #     , sep = "\n"
+  #   )
+  # }
 
   system(build_cmd)
   src <- file.path(lib_folder, paste0("lib_lightgbm", SHLIB_EXT), fsep = "/")