FindQt4: define QT_IMPORTS_DIR variable even if it is not present on the system.

This happens when there are no plugins currently installed.

Patch qt_import_dir_variable.diff. Stolen from Ubuntu.

debian/changelog

@@ -3,6 +3,9 @@ cmake (2.8.11-1) UNRELEASED; urgency=low
   * New upstream release.
   * Add multiarch-python-include-dirs.diff to support multi-arch capable
     python. Stolen from Ubuntu.
+  * FindQt4: define QT_IMPORTS_DIR variable even if it is not present on
+    the system (i.e. there are no plugins currently installed). Stolen
+    from Ubuntu. Patch qt_import_dir_variable.diff.
 
  -- Modestas Vainius <modax@debian.org>  Sun, 19 May 2013 12:12:26 +0300
 

debian/patches/qt_import_dir_variable.diff

@@ -0,0 +1,19 @@
+From: Jonathan Riddell <jriddell@ubuntu.com>
+Subject: FindQt4: define QT_IMPORTS_DIR variable even if it is not present on the system.
+Date: 2012-01-18 16:00:49 UTC
+Bug-Ubuntu: https://bugs.launchpad.net/ubuntu/+source/cmake/+bug/894805
+Origin: vendor
+
+This happens when there are no plugins currently installed.
+
+--- a/Modules/FindQt4.cmake
++++ b/Modules/FindQt4.cmake
+@@ -758,7 +758,7 @@ if (QT_QMAKE_EXECUTABLE AND QTVERSION)
+   if (QT_LIBRARY_DIR AND NOT QT_IMPORTS_DIR OR QT_QMAKE_CHANGED)
+     _qt4_query_qmake(QT_INSTALL_IMPORTS qt_imports_dir)
+     if(qt_imports_dir)
+-      set(QT_IMPORTS_DIR NOTFOUND)
++      set(QT_IMPORTS_DIR "${qt_imports_dir}")
+       foreach(qt_cross_path ${CMAKE_FIND_ROOT_PATH})
+         set(qt_cross_paths ${qt_cross_paths} "${qt_cross_path}/imports")
+       endforeach()

debian/patches/series

@@ -2,3 +2,4 @@ FindBoost_add_-lpthread_#563479.diff
 multiarch_findgtk2_fix.diff
 install_to_multiarch_libdir_on_kfreebsd_hurd.diff
 multiarch-python-include-dirs.diff
+qt_import_dir_variable.diff