diff --git a/Repository.mk b/Repository.mk
index 6cbdc2fc5760..87253d01149a 100644
--- a/Repository.mk
+++ b/Repository.mk
@@ -153,9 +153,6 @@ $(eval $(call gb_Helper_register_libraries,PLAINLIBS_OOO, \
 	fileacc \
 	mcnttype \
 	neon \
-	nspr4 \
-	nss3 \
-	plc4 \
 	test \
 	xmlsecurity \
 	xsec_fw \
diff --git a/RepositoryExternal.mk b/RepositoryExternal.mk
index c0c97050add4..ed87327feb1b 100644
--- a/RepositoryExternal.mk
+++ b/RepositoryExternal.mk
@@ -658,4 +658,33 @@ $(call gb_LinkTarget_add_libs,$(1), \
 
 endef
 
+ifeq ($(SYSTEM_MOZILLA),YES)
+
+define gb_LinkTarget__use_plc4
+$(call gb_LinkTarget_set_include,$(1),\
+    $$(INCLUDE) \
+    $(MOZ_NSS_CFLAGS) \
+)
+
+$(call gb_LinkTarget_add_libs,$(1),\
+    $(MOZ_NSS_LIBS) \
+)
+endef
+
+else
+
+define gb_LinkTarget__use_plc4
+$(eval $(call gb_Helper_register_libraries,PLAINLIBS_OOO,\
+    nspr4 \
+    nss3 \
+    plc4 \
+))
+
+$(call gb_LinkTarget_add_linked_libs,$(1),\
+    plc4 \
+)
+endef
+
+endif
+
 # vim: set noet sw=4 ts=4:
diff --git a/xmlsecurity/Library_xsec_xmlsec.mk b/xmlsecurity/Library_xsec_xmlsec.mk
index 770122ec2586..15a22167119e 100644
--- a/xmlsecurity/Library_xsec_xmlsec.mk
+++ b/xmlsecurity/Library_xsec_xmlsec.mk
@@ -124,7 +124,7 @@ $(eval $(call gb_Library_add_linked_static_libs,xsec_xmlsec,\
 	xmlsec1-nss \
 ))
 
-$(eval $(call gb_Library_add_linked_libs,xsec_xmlsec,\
+$(eval $(call gb_Library_use_externals,xsec_xmlsec,\
 	plc4 \
 ))