xdocs plugin build failure

build.log

gerrit $ buck build plugins/xdocs
Using buckd.
[-] PROCESSING BUCK FILES...FINISHED 0.1s
[+] BUILDING...0.4s (185/187 JOBS)
 |=> IDLE
 |=> IDLE
 |=> IDLE
 |=> IDLE
 |=> //plugins/xdocs:xdocs__plugin...  0.3s (running javac[0.3s])
/Users/david/git/gerrit/plugins/xdocs/src/main/java/com/googlesource/gerrit/plugins/xdocs/XDocServlet.java:40: error: package com.google.gwtexpui.server does not exist
import com.google.gwtexpui.server.CacheHeaders;
                                 ^
/Users/david/git/gerrit/plugins/xdocs/src/main/java/com/googlesource/gerrit/plugins/xdocs/XDocServlet.java:46: error: package eu.medsea.mimeutil does not exist
import eu.medsea.mimeutil.MimeType;
                         ^
/Users/david/git/gerrit/plugins/xdocs/src/main/java/com/googlesource/gerrit/plugins/xdocs/XDocServlet.java:40: error: package com.google.gwtexpui.server does not exist
import com.google.gwtexpui.server.CacheHeaders;
                                 ^
/Users/david/git/gerrit/plugins/xdocs/src/main/java/com/googlesource/gerrit/plugins/xdocs/XDocServlet.java:46: error: package eu.medsea.mimeutil does not exist
import eu.medsea.mimeutil.MimeType;
                         ^
/Users/david/git/gerrit/plugins/xdocs/src/main/java/com/googlesource/gerrit/plugins/xdocs/XDocServlet.java:106: error: cannot find symbol
      CacheHeaders.setNotCacheable(res);
      ^
  symbol:   variable CacheHeaders
  location: class com.googlesource.gerrit.plugins.xdocs.XDocServlet
/Users/david/git/gerrit/plugins/xdocs/src/main/java/com/googlesource/gerrit/plugins/xdocs/XDocServlet.java:122: error: cannot find symbol
    MimeType mimeType = fileTypeRegistry.getMimeType(key.file, null);
    ^
  symbol:   class MimeType
  location: class com.googlesource.gerrit.plugins.xdocs.XDocServlet
/Users/david/git/gerrit/plugins/xdocs/src/main/java/com/googlesource/gerrit/plugins/xdocs/XDocServlet.java:195: error: cannot find symbol
        CacheHeaders.setCacheablePrivate(res, 7, TimeUnit.DAYS, false);
        ^
  symbol:   variable CacheHeaders
  location: class com.googlesource.gerrit.plugins.xdocs.XDocServlet
/Users/david/git/gerrit/plugins/xdocs/src/main/java/com/googlesource/gerrit/plugins/xdocs/XDocServlet.java:225: error: cannot find symbol
        MimeType mimeType = fileTypeRegistry.getMimeType(file, content);
        ^
  symbol:   class MimeType
  location: class com.googlesource.gerrit.plugins.xdocs.XDocServlet
Errors: 8. Warnings: 0.
BUILD FAILED: //plugins/xdocs:xdocs__plugin failed with exit code 1:
javac
plugins/xdocs/BUCK (:xdocs__plugin) is missing deps:
    '//gerrit-gwtexpui:server',

Looks like gwtexpui is missing? I wonder how it works at all? Maven would also need gwtexpui. This dependency is for example used in service user plugin that also depends on gwtexpui.

<dependency>
      <groupId>gwtexpui</groupId>
      <artifactId>gwtexpui</artifactId>
      <version>1.3.4</version>
      <scope>provided</scope>
    </dependency>

I can't imagine that it works in standalone mode and or with Maven. So all three modes are broken?