diff -r 1cc848548f21 -r e92f2e44e4d8 src/Pure/Tools/build_docker.scala
--- a/src/Pure/Tools/build_docker.scala	Sun Mar 14 20:29:26 2021 +0100
+++ b/src/Pure/Tools/build_docker.scala	Sun Mar 14 21:02:34 2021 +0100
@@ -15,7 +15,7 @@
   private val Isabelle_Name = """^.*?(Isabelle[^/\\:]+)_linux\.tar\.gz$""".r
 
   val packages: List[String] =
-    List("curl", "less", "libfontconfig1", "libgomp1", "libwww-perl", "pwgen", "rlwrap", "unzip")
+    List("curl", "less", "libfontconfig1", "libgomp1", "perl", "pwgen", "rlwrap", "unzip")
 
   val package_collections: Map[String, List[String]] =
     Map("X11" -> List("libx11-6", "libxext6", "libxrender1", "libxtst6", "libxi6"),