diff --git a/Makefile b/Makefile
index cd52d64..7880094 100644
--- a/Makefile
+++ b/Makefile
@@ -55,6 +55,14 @@ config:
 	@echo "  WEB_SERVER_PORT         = $(WEB_SERVER_PORT)"
 	@echo "  WEB_SERVER_DOCUMENT_ROOT= $(WEB_SERVER_DOCUMENT_ROOT)"
 	@echo ""
+	@echo "HTML5 Client JavaScript URLs:"
+	@echo "  JQUERY_JS_URL           = $(JQUERY_JS_URL)"
+	@echo "  MUSTACHE_JS_URL         = $(MUSTACHE_JS_URL)"
+	@echo "  CBUFFER_JS_URL          = $(CBUFFER_JS_URL)"
+	@echo "  BOOTSTRAP_JS_URL        = $(BOOTSTRAP_JS_URL)"
+	@echo "  D3_JS_URL               = $(D3_JS_URL)"
+	@echo "  PAKO_JS_URL             = $(PAKO_JS_URL)"
+	@echo ""
 	@echo "Performance:"
 	@echo "  RT_CPU                  = $(RT_CPU) (CPU core for sampling thread)"
 	@echo "  RT_CPU_TOPTALK          = $(RT_CPU_TOPTALK) (CPU core for packet capture threads)"
diff --git a/html5-client/Makefile b/html5-client/Makefile
index d9231c1..f459e4d 100644
--- a/html5-client/Makefile
+++ b/html5-client/Makefile
@@ -103,6 +103,12 @@ assemble-html: createdirs
 	perl -pe 's|##PCAP-BUTTON##|`cat $(PCAP_BUTTON_PART)`|ge' -i ${TPL}
 	perl -pe 's|##PCAP-DISABLED-MODAL##|`cat $(PCAP_DISABLED_MODAL_PART)`|ge' -i ${TPL}
 	perl -pe 's|##PRODUCT-BRANDING##|${PRODUCT_BRANDING}|ge' -i ${TPL}
+	perl -pe 's|##JQUERY-JS-URL##|$(JQUERY_JS_URL)|g' -i ${TPL}
+	perl -pe 's|##MUSTACHE-JS-URL##|$(MUSTACHE_JS_URL)|g' -i ${TPL}
+	perl -pe 's|##CBUFFER-JS-URL##|$(CBUFFER_JS_URL)|g' -i ${TPL}
+	perl -pe 's|##BOOTSTRAP-JS-URL##|$(BOOTSTRAP_JS_URL)|g' -i ${TPL}
+	perl -pe 's|##D3-JS-URL##|$(D3_JS_URL)|g' -i ${TPL}
+	perl -pe 's|##PAKO-JS-URL##|$(PAKO_JS_URL)|g' -i ${TPL}
 
 install:
 	install -d ${DESTDIR}/var/lib/jittertrap/
diff --git a/html5-client/src/html/index.tpl.html b/html5-client/src/html/index.tpl.html
index 5bf350c..5a742e8 100644
--- a/html5-client/src/html/index.tpl.html
+++ b/html5-client/src/html/index.tpl.html
@@ -12,12 +12,12 @@
 
     <link rel="icon" href="favicon.svg" type="image/svg+xml">
 
-    <script type="text/javascript" src="js/jquery-3.7.1.min.js"></script>
-    <script type="text/javascript" src="js/mustache.min.js"></script>
-    <script type="text/javascript" src="js/cbuffer.js"></script>
-    <script type="text/javascript" src="js/bootstrap.bundle.min.js"></script>
-    <script type="text/javascript" src="js/d3.v7.min.js"></script>
-    <script type="text/javascript" src="js/pako.min.js"></script>
+    <script type="text/javascript" src="##JQUERY-JS-URL##"></script>
+    <script type="text/javascript" src="##MUSTACHE-JS-URL##"></script>
+    <script type="text/javascript" src="##CBUFFER-JS-URL##"></script>
+    <script type="text/javascript" src="##BOOTSTRAP-JS-URL##"></script>
+    <script type="text/javascript" src="##D3-JS-URL##"></script>
+    <script type="text/javascript" src="##PAKO-JS-URL##"></script>
     <script type="text/javascript" src="js/jittertrap-concat.js"></script>
 
   </head>
diff --git a/make.config b/make.config
index cc67cfd..23b2c30 100644
--- a/make.config
+++ b/make.config
@@ -55,6 +55,33 @@ ifndef WEB_SERVER_DOCUMENT_ROOT
 WEB_SERVER_DOCUMENT_ROOT = /var/lib/jittertrap
 endif
 
+# Third-party JavaScript URLs used by the HTML5 client. Defaults match files
+# copied into output/js by html5-client/Makefile. Override these for packaging
+# systems that serve shared JavaScript dependencies from system paths or CDNs.
+ifndef JQUERY_JS_URL
+JQUERY_JS_URL = js/jquery-3.7.1.min.js
+endif
+
+ifndef MUSTACHE_JS_URL
+MUSTACHE_JS_URL = js/mustache.min.js
+endif
+
+ifndef CBUFFER_JS_URL
+CBUFFER_JS_URL = js/cbuffer.js
+endif
+
+ifndef BOOTSTRAP_JS_URL
+BOOTSTRAP_JS_URL = js/bootstrap.bundle.min.js
+endif
+
+ifndef D3_JS_URL
+D3_JS_URL = js/d3.v7.min.js
+endif
+
+ifndef PAKO_JS_URL
+PAKO_JS_URL = js/pako.min.js
+endif
+
 # ------------------------------------------------------------------------------
 # Performance Tuning
 # ------------------------------------------------------------------------------