langtools ant build fails

Build langtools using the ant build (in make/langtools) fails with:
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build-all-classes:
     [exec] /usr/local/home/lahvac/src/jdk/jdk10/src/jdk.jshell/share/classes/jdk/internal/jshell/tool/JShellTool.java:3011: error: cannot find symbol
     [exec] var url = new URL(filename);
     [exec] ^
     [exec] symbol: class var
     [exec] location: class JShellTool
     [exec] /usr/local/home/lahvac/src/jdk/jdk10/src/jdk.jshell/share/classes/jdk/internal/jshell/tool/JShellTool.java:3018: error: cannot find symbol
     [exec] try (var scannerIOContext = new ScannerIOContext(scanner)) {
     [exec] ^
     [exec] symbol: class var
     [exec] location: class JShellTool
     [exec] 2 errors
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