Make doctools optional

CMakeLists.txt

@@ -58,7 +58,6 @@ find_package(Grantlee5 "5.2" CONFIG REQUIRED)
 
 # Find KF5 package
 find_package(KF5Crash ${KF5_MIN_VERSION} REQUIRED)
-find_package(KF5DocTools ${KF5_MIN_VERSION} REQUIRED)
 find_package(KF5KCMUtils ${KF5_MIN_VERSION} CONFIG REQUIRED)
 find_package(KF5NotifyConfig ${KF5_MIN_VERSION} CONFIG REQUIRED)
 find_package(KF5Parts ${KF5_MIN_VERSION} CONFIG REQUIRED)
@@ -66,6 +65,12 @@ find_package(KF5TextWidgets ${KF5_MIN_VERSION} CONFIG REQUIRED)
 find_package(KF5XmlGui ${KF5_MIN_VERSION} CONFIG REQUIRED)
 find_package(KF5Notifications ${KF5_MIN_VERSION} CONFIG REQUIRED)
 find_package(KF5Syndication ${KF5_MIN_VERSION} CONFIG REQUIRED)
+find_package(KF5DocTools ${KF5_MIN_VERSION})
+set_package_properties(KF5DocTools PROPERTIES DESCRIPTION
+    "Tools to generate documentation"
+    TYPE OPTIONAL
+)
+
 
 # Find KdepimLibs Package
 find_package(KF5GrantleeTheme ${LIBGRANTLEETHEME_LIB_VERSION} CONFIG REQUIRED)
@@ -113,8 +118,11 @@ ecm_qt_install_logging_categories(
         FILE akregator.categories
         DESTINATION ${KDE_INSTALL_LOGGINGCATEGORIESDIR}
         )
-add_subdirectory(doc)
 kde_configure_git_pre_commit_hook(CHECKS CLANG_FORMAT)
 ki18n_install(po)
-kdoctools_install(po)
+if(KF5DocTools_FOUND)
+    kdoctools_install(po)
+    add_subdirectory(doc)
+endif()
+
 feature_summary(WHAT ALL FATAL_ON_MISSING_REQUIRED_PACKAGES)