diff -urN a/js/src/Makefile.in b/js/src/Makefile.in
--- a/js/src/Makefile.in	2013-03-25 15:34:20.000000000 -0500
+++ b/js/src/Makefile.in	2014-03-08 08:26:36.726979744 -0600
@@ -788,7 +788,7 @@
 	$(PYTHON) $(topsrcdir)/config/Preprocessor.py $(JS_CONFIG_SUBSTITUTIONS) $< > $@
 
 install:: $(LIBRARY_NAME).pc
-		$(SYSINSTALL) $^ $(DESTDIR)$(libdir)/pkgconfig
+		$(SYSINSTALL) -m 0644 $^ $(DESTDIR)$(libdir)/pkgconfig
 
 ######################################################
 # BEGIN SpiderMonkey header installation
@@ -836,19 +836,19 @@
 #
 
 install:: $(INSTALLED_HEADERS)
-	$(SYSINSTALL) $^ $(DESTDIR)$(includedir)/$(MODULE)
+	$(SYSINSTALL) -m 0644 $^ $(DESTDIR)$(includedir)/$(MODULE)
 
 install:: $(EXPORTS_ds)
-	$(SYSINSTALL) $^ $(DESTDIR)$(includedir)/$(MODULE)/ds
+	$(SYSINSTALL) -m 0644 $^ $(DESTDIR)$(includedir)/$(MODULE)/ds
 
 install:: $(EXPORTS_gc)
-	$(SYSINSTALL) $^ $(DESTDIR)$(includedir)/$(MODULE)/gc
+	$(SYSINSTALL) -m 0644 $^ $(DESTDIR)$(includedir)/$(MODULE)/gc
 
 install:: $(EXPORTS_js)
-	$(SYSINSTALL) $^ $(DESTDIR)$(includedir)/$(MODULE)/js
+	$(SYSINSTALL) -m 0644 $^ $(DESTDIR)$(includedir)/$(MODULE)/js
 
 install:: $(EXPORTS_mozilla)
-	$(SYSINSTALL) $^ $(DESTDIR)$(includedir)/$(MODULE)/mozilla
+	$(SYSINSTALL) -m 0644 $^ $(DESTDIR)$(includedir)/$(MODULE)/mozilla
 
 #
 # END SpiderMonkey header installation