diff -Naur nss-3.29.5.orig/nss/cmd/shlibsign/Makefile nss-3.29.5/nss/cmd/shlibsign/Makefile
--- nss-3.29.5.orig/nss/cmd/shlibsign/Makefile	2017-09-08 10:56:01.663876686 +0200
+++ nss-3.29.5/nss/cmd/shlibsign/Makefile	2017-09-08 10:57:19.659306831 +0200
@@ -95,5 +95,7 @@
     endif
 endif
 
-libs install :: $(CHECKLOC)
+ifndef SKIP_SHLIBSIGN
+	libs install :: $(CHECKLOC)
+endif