diff --git a/src/Pure/Admin/build_minisat.scala b/src/Pure/Admin/build_minisat.scala
--- a/src/Pure/Admin/build_minisat.scala
+++ b/src/Pure/Admin/build_minisat.scala
@@ -1,153 +1,153 @@
 /*  Title:      Pure/Admin/build_minisat.scala
     Author:     Makarius
 
 Build Isabelle Minisat from sources.
 */
 
 package isabelle
 
 
 object Build_Minisat
 {
   val default_download_url = "https://github.com/stp/minisat/archive/releases/2.2.1.tar.gz"
 
   def make_component_name(version: String): String = "minisat-" + version
 
 
   /* build Minisat */
 
   def build_minisat(
     download_url: String = default_download_url,
     component_name: String = "",
     verbose: Boolean = false,
     progress: Progress = new Progress,
     target_dir: Path = Path.current): Unit =
   {
     Isabelle_System.with_tmp_dir("build")(tmp_dir =>
     {
       /* component */
 
       val Archive_Name = """^.*?([^/]+)$""".r
       val Version = """^v?([0-9.]+)\.tar.gz$""".r
 
       val archive_name =
         download_url match {
           case Archive_Name(name) => name
           case _ => error("Failed to determine source archive name from " + quote(download_url))
         }
 
       val version =
         archive_name match {
           case Version(version) => version
           case _ => error("Failed to determine component version from " + quote(archive_name))
         }
 
       val component = proper_string(component_name) getOrElse make_component_name(version)
       val component_dir = Isabelle_System.new_directory(target_dir + Path.basic(component))
       progress.echo("Component " + component_dir)
 
 
       /* platform */
 
       val platform_name =
         proper_string(Isabelle_System.getenv("ISABELLE_PLATFORM64")) getOrElse
           error("No 64bit platform")
 
       val platform_dir = Isabelle_System.make_directory(component_dir + Path.basic(platform_name))
 
 
       /* download source */
 
       val archive_path = tmp_dir + Path.basic(archive_name)
       Isabelle_System.download_file(download_url, archive_path, progress = progress)
 
       Isabelle_System.bash("tar xzf " + File.bash_path(archive_path), cwd = tmp_dir.file).check
       val source_name = File.get_dir(tmp_dir)
 
       Isabelle_System.bash(
         "tar xzf " + archive_path + " && mv " + Bash.string(source_name) + " src",
         cwd = component_dir.file).check
 
 
       /* build */
 
       progress.echo("Building Minisat for " + platform_name + " ...")
 
       val build_dir = tmp_dir + Path.basic(source_name)
       Isabelle_System.copy_file(build_dir + Path.explode("LICENSE"), component_dir)
 
       if (Platform.is_macos) {
         File.change(build_dir + Path.explode("Makefile"),
           _.replaceAll("--static", "").replaceAll("-Wl,-soname\\S+", ""))
       }
       progress.bash("make r", build_dir.file, echo = verbose).check
 
       Isabelle_System.copy_file(
         build_dir + Path.explode("build/release/bin/minisat").platform_exe, platform_dir)
 
 
       /* settings */
 
       val etc_dir = Isabelle_System.make_directory(component_dir + Path.basic("etc"))
       File.write(etc_dir + Path.basic("settings"),
         """# -*- shell-script -*- :mode=shellscript:
 
 MINISAT_HOME="$COMPONENT/$ISABELLE_PLATFORM64"
 
 ISABELLE_MINISAT="$MINISAT_HOME/minisat"
 """)
 
 
       /* README */
 
       File.write(component_dir + Path.basic("README"),
-        "This Isabelle component provides Minisat " + version + """using the
+        "This Isabelle component provides Minisat " + version + """ using the
 sources from """.stripMargin + download_url + """
 
 The executables have been built via "make r"; macOS requires to
 remove options "--static" and "-Wl,-soname,..." from the Makefile.
 
 
         Makarius
         """ + Date.Format.date(Date.now()) + "\n")
     })
   }
 
 
   /* Isabelle tool wrapper */
 
   val isabelle_tool =
     Isabelle_Tool("build_minisat", "build prover component from sources", Scala_Project.here,
     args =>
     {
       var target_dir = Path.current
       var download_url = default_download_url
       var component_name = ""
       var verbose = false
 
       val getopts = Getopts("""
 Usage: isabelle build_minisat [OPTIONS]
 
   Options are:
     -D DIR       target directory (default ".")
     -U URL       download URL
                  (default: """" + default_download_url + """")
     -n NAME      component name (default: """" + make_component_name("VERSION") + """")
     -v           verbose
 
   Build prover component from official download.
 """,
         "D:" -> (arg => target_dir = Path.explode(arg)),
         "U:" -> (arg => download_url = arg),
         "n:" -> (arg => component_name = arg),
         "v" -> (_ => verbose = true))
 
       val more_args = getopts(args)
       if (more_args.nonEmpty) getopts.usage()
 
       val progress = new Console_Progress()
 
       build_minisat(download_url = download_url, component_name = component_name,
         verbose = verbose, progress = progress, target_dir = target_dir)
     })
 }