Qt configuration gui can't be build

Steps to reproduce:

1. Schedule build from coin
2. Select project qt-apps/tqtc-qt-config-gui, branch=dev
3. Select configuration
   • RHEL_7_4 (gcc-x86_64) - Packaging,Release,NoUseGoldLinker,ForceDebugInfo,SeparateDebugInfo,Static
4. "Build and test on these configurations"

Expected outcome:

• Build succeeds

Actual outcome:

• Build fails with following error:

• agent:2018/06/19 10:33:26 build.go:173: Note: Using static linking will disable the use of dynamically
  agent:2018/06/19 10:33:26 build.go:173: loaded plugins. Make sure to import all needed static plugins,
  agent:2018/06/19 10:33:26 build.go:173: or compile needed modules into the library.
  agent:2018/06/19 10:33:26 build.go:173: 
  agent:2018/06/19 10:33:26 build.go:173: ERROR: Feature 'separate_debug_info' was enabled, but the pre-condition 'features.shared' failed.
  agent:2018/06/19 10:33:26 build.go:176: Error reading from stdout/err: exit status 3

• See for example http://coin.intra.qt.io/coin/integration/qt-apps/tqtc-qt-config-gui/tasks/web_qt-apps_tqtc-qt-config-gui_1529393133832