diff -urN a/js/src/Makefile.in b/js/src/Makefile.in
--- a/js/src/Makefile.in	2013-11-19 13:42:43.000000000 -0600
+++ b/js/src/Makefile.in	2014-03-08 08:07:28.331006149 -0600
@@ -542,7 +542,7 @@
 	$(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
@@ -569,13 +569,13 @@
 #
 
 install:: $(EXPORTS)
-	$(SYSINSTALL) $^ $(DESTDIR)$(includedir)/$(LIBRARY_NAME)
+	$(SYSINSTALL) -m 0644 $^ $(DESTDIR)$(includedir)/$(LIBRARY_NAME)
 
 install:: $(EXPORTS_js)
-	$(SYSINSTALL) $^ $(DESTDIR)$(includedir)/$(LIBRARY_NAME)/js
+	$(SYSINSTALL) -m 0644 $^ $(DESTDIR)$(includedir)/$(LIBRARY_NAME)/js
 
 install:: $(EXPORTS_mozilla)
-	$(SYSINSTALL) $^ $(DESTDIR)$(includedir)/$(LIBRARY_NAME)/mozilla
+	$(SYSINSTALL) -m 0644 $^ $(DESTDIR)$(includedir)/$(LIBRARY_NAME)/mozilla
 
 #
 # END SpiderMonkey header installation