diff -r 1222c010bff7 -r 9ed87c82cbe7 src/Pure/build-jars
--- a/src/Pure/build-jars	Tue Feb 28 17:51:49 2017 +0100
+++ b/src/Pure/build-jars	Tue Feb 28 19:50:08 2017 +0100
@@ -9,6 +9,7 @@
 ## sources
 
 declare -a SOURCES=(
+  Admin/build_cygwin.scala
   Admin/build_doc.scala
   Admin/build_docker.scala
   Admin/build_history.scala