diff --git a/.gitignore b/.gitignore
index 20c4f52cd37860e6d124bf4859c9c795d2db5e53..865102a853c4eb931dfe48653a91187aeb216f80 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,6 +28,10 @@
 
 # Nested build directory
 /build*
+!build.sh
+
+# Nested install directory
+/install*
 
 #==============================================================================#
 # Explicit files to ignore (only matches one).
diff --git a/build.sh b/build.sh
old mode 100644
new mode 100755