Simplify the autoload require logic.

1 files changed, 4 insertions, 0 deletions

diff --git a/doc/hacking.md b/doc/hacking.md
index 1268f36fb1..fcaead8965 100644
--- a/doc/hacking.md
+++ b/doc/hacking.md
@@ -42,6 +42,10 @@ If you are frequently building Ruby, this will reduce the time it takes to `make
 ../configure --disable-install-doc
 ```
 
+### Unexplainable Build Errors
+
+If you are having unexplainable build errors, after saving all your work, try running `git clean -xfd` in the source root to remove all git ignored local files. If you are working from a source directory that's been updated several times, you may have temporary build artefacts from previous releases which can cause build failures.
+
 ## Running Ruby
 
 ### Run Local Test Script