diff --git a/Makefile b/Makefile
index ab7b5b60..efa656d7 100644
--- a/Makefile
+++ b/Makefile
@@ -43,6 +43,20 @@ installheaders::
 	chmod 644 $(HEADER_DIR)/c++/v1/ext/*
 	chmod 755 $(HEADER_DIR)/c++/v1/experimental
 	chmod 644 $(HEADER_DIR)/c++/v1/experimental/*
+	chmod 755 $(HEADER_DIR)/c++/v1/support
+	chmod 644 $(HEADER_DIR)/c++/v1/support/*
+	chmod 755 $(HEADER_DIR)/c++/v1/support/android
+	chmod 644 $(HEADER_DIR)/c++/v1/support/android/*
+	chmod 755 $(HEADER_DIR)/c++/v1/support/ibm
+	chmod 644 $(HEADER_DIR)/c++/v1/support/ibm/*
+	chmod 755 $(HEADER_DIR)/c++/v1/support/newlib
+	chmod 644 $(HEADER_DIR)/c++/v1/support/newlib/*
+	chmod 755 $(HEADER_DIR)/c++/v1/support/solaris
+	chmod 644 $(HEADER_DIR)/c++/v1/support/solaris/*
+	chmod 755 $(HEADER_DIR)/c++/v1/support/win32
+	chmod 644 $(HEADER_DIR)/c++/v1/support/win32/*
+	chmod 755 $(HEADER_DIR)/c++/v1/support/xlocale
+	chmod 644 $(HEADER_DIR)/c++/v1/support/xlocale/*
 
 install::