diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,7 +26,7 @@
 # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #=============================================================================
 
-cmake_minimum_required(VERSION 2.8.12 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
 
 #
 # Preliminary setup
diff --git a/kde-modules/KDECompilerSettings.cmake b/kde-modules/KDECompilerSettings.cmake
--- a/kde-modules/KDECompilerSettings.cmake
+++ b/kde-modules/KDECompilerSettings.cmake
@@ -204,18 +204,9 @@
 ############################################################
 
 # Pick sensible versions of the C and C++ standards.
-# Note that MSVC does not have equivalent flags; the features are either
-# supported or they are not.
-if (CMAKE_C_COMPILER_ID STREQUAL "GNU" OR CMAKE_C_COMPILER_ID MATCHES "Clang")
-    # We use the C89 standard because that is what is common to all our
-    # compilers (in particular, MSVC 2010 does not support C99)
-    set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS} -std=iso9899:1990")
-endif()
-if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU" OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
-elseif (CMAKE_CXX_COMPILER_ID STREQUAL "Intel" AND NOT WIN32)
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
-endif()
+set(CMAKE_C_STANDARD 90)
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
 
 # Do not merge uninitialized global variables.
 # This is mostly a "principle of least surprise" thing, but also
diff --git a/tests/ECMAddAppIconTest/CMakeLists.txt b/tests/ECMAddAppIconTest/CMakeLists.txt
--- a/tests/ECMAddAppIconTest/CMakeLists.txt
+++ b/tests/ECMAddAppIconTest/CMakeLists.txt
@@ -1,5 +1,5 @@
 project(ECMAddAppIconTest)
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 set(CMAKE_MODULE_PATH
     ${CMAKE_CURRENT_SOURCE_DIR}/../../modules
diff --git a/tests/ECMAddTests/multi_tests/CMakeLists.txt b/tests/ECMAddTests/multi_tests/CMakeLists.txt
--- a/tests/ECMAddTests/multi_tests/CMakeLists.txt
+++ b/tests/ECMAddTests/multi_tests/CMakeLists.txt
@@ -1,5 +1,5 @@
 project(ECMAddTests)
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 set(ECM_MODULE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../../modules)
 set(CMAKE_MODULE_PATH "${ECM_MODULE_DIR}")
diff --git a/tests/ECMAddTests/single_tests/CMakeLists.txt b/tests/ECMAddTests/single_tests/CMakeLists.txt
--- a/tests/ECMAddTests/single_tests/CMakeLists.txt
+++ b/tests/ECMAddTests/single_tests/CMakeLists.txt
@@ -1,5 +1,5 @@
 project(ECMAddTests)
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 set(ECM_MODULE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../../modules)
 set(CMAKE_MODULE_PATH "${ECM_MODULE_DIR}")
diff --git a/tests/ECMInstallIconsTest/CMakeLists.txt b/tests/ECMInstallIconsTest/CMakeLists.txt
--- a/tests/ECMInstallIconsTest/CMakeLists.txt
+++ b/tests/ECMInstallIconsTest/CMakeLists.txt
@@ -1,5 +1,5 @@
 project(ECMInstallIconsTest)
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/../../modules)
 
diff --git a/tests/ECMPoQmToolsTest/CMakeLists.txt b/tests/ECMPoQmToolsTest/CMakeLists.txt
--- a/tests/ECMPoQmToolsTest/CMakeLists.txt
+++ b/tests/ECMPoQmToolsTest/CMakeLists.txt
@@ -1,5 +1,5 @@
 project(ECMPoQmToolsTest)
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 set(ECM_MODULE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../../modules")
 
 set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/../../modules)
diff --git a/tests/ECMQMLModules/CMakeLists.txt b/tests/ECMQMLModules/CMakeLists.txt
--- a/tests/ECMQMLModules/CMakeLists.txt
+++ b/tests/ECMQMLModules/CMakeLists.txt
@@ -1,5 +1,5 @@
 project(extra-cmake-modules)
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 set(ECM_FIND_MODULE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../find-modules)
 set(ECM_MODULE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../modules)
diff --git a/tests/ECMQtDeclareLoggingCategoryTest/CMakeLists.txt b/tests/ECMQtDeclareLoggingCategoryTest/CMakeLists.txt
--- a/tests/ECMQtDeclareLoggingCategoryTest/CMakeLists.txt
+++ b/tests/ECMQtDeclareLoggingCategoryTest/CMakeLists.txt
@@ -1,5 +1,5 @@
 project(ECMQtDeclareLoggingCategoryTest)
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 set(ECM_MODULE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../../modules")
 
 set(CMAKE_MODULE_PATH ${ECM_MODULE_DIR})
diff --git a/tests/ECMSetupVersionTest/old_header/CMakeLists.txt b/tests/ECMSetupVersionTest/old_header/CMakeLists.txt
--- a/tests/ECMSetupVersionTest/old_header/CMakeLists.txt
+++ b/tests/ECMSetupVersionTest/old_header/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 project(old_header)
 
diff --git a/tests/ECMSetupVersionTest/old_header_abspath/CMakeLists.txt b/tests/ECMSetupVersionTest/old_header_abspath/CMakeLists.txt
--- a/tests/ECMSetupVersionTest/old_header_abspath/CMakeLists.txt
+++ b/tests/ECMSetupVersionTest/old_header_abspath/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 project(old_header_abspath)
 
diff --git a/tests/ECMSetupVersionTest/old_simple/CMakeLists.txt b/tests/ECMSetupVersionTest/old_simple/CMakeLists.txt
--- a/tests/ECMSetupVersionTest/old_simple/CMakeLists.txt
+++ b/tests/ECMSetupVersionTest/old_simple/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 project(old_simple)
 
diff --git a/tests/ECMSetupVersionTest/old_soversion/CMakeLists.txt b/tests/ECMSetupVersionTest/old_soversion/CMakeLists.txt
--- a/tests/ECMSetupVersionTest/old_soversion/CMakeLists.txt
+++ b/tests/ECMSetupVersionTest/old_soversion/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 project(old_soversion)
 
diff --git a/tests/ECMSetupVersionTest/old_version_file/CMakeLists.txt b/tests/ECMSetupVersionTest/old_version_file/CMakeLists.txt
--- a/tests/ECMSetupVersionTest/old_version_file/CMakeLists.txt
+++ b/tests/ECMSetupVersionTest/old_version_file/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 project(old_version_file)
 
diff --git a/tests/ECMSetupVersionTest/old_version_file_abspath/CMakeLists.txt b/tests/ECMSetupVersionTest/old_version_file_abspath/CMakeLists.txt
--- a/tests/ECMSetupVersionTest/old_version_file_abspath/CMakeLists.txt
+++ b/tests/ECMSetupVersionTest/old_version_file_abspath/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 project(old_version_file_abspath)
 
diff --git a/tests/ECMSetupVersionTest/old_version_file_anynewer/CMakeLists.txt b/tests/ECMSetupVersionTest/old_version_file_anynewer/CMakeLists.txt
--- a/tests/ECMSetupVersionTest/old_version_file_anynewer/CMakeLists.txt
+++ b/tests/ECMSetupVersionTest/old_version_file_anynewer/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 project(old_version_file_anynewer)
 
diff --git a/tests/ECMSetupVersionTest/old_version_file_exact/CMakeLists.txt b/tests/ECMSetupVersionTest/old_version_file_exact/CMakeLists.txt
--- a/tests/ECMSetupVersionTest/old_version_file_exact/CMakeLists.txt
+++ b/tests/ECMSetupVersionTest/old_version_file_exact/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 project(old_version_file_exact)
 
diff --git a/tests/ECMSetupVersionTest/old_version_file_samemajor/CMakeLists.txt b/tests/ECMSetupVersionTest/old_version_file_samemajor/CMakeLists.txt
--- a/tests/ECMSetupVersionTest/old_version_file_samemajor/CMakeLists.txt
+++ b/tests/ECMSetupVersionTest/old_version_file_samemajor/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 project(old_version_file_samemajor)
 
diff --git a/tests/ExecuteCoreModules/CMakeLists.txt b/tests/ExecuteCoreModules/CMakeLists.txt
--- a/tests/ExecuteCoreModules/CMakeLists.txt
+++ b/tests/ExecuteCoreModules/CMakeLists.txt
@@ -1,5 +1,5 @@
 project(ExecuteCoreModules)
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 file(GLOB all_core_modules "${CMAKE_CURRENT_SOURCE_DIR}/../../modules/*cmake")
 
diff --git a/tests/ExecuteKDEModules/CMakeLists.txt b/tests/ExecuteKDEModules/CMakeLists.txt
--- a/tests/ExecuteKDEModules/CMakeLists.txt
+++ b/tests/ExecuteKDEModules/CMakeLists.txt
@@ -1,5 +1,5 @@
 project(ExecuteKDEModules)
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 # order is important (install dirs before cmake settings)!
 set(all_kde_modules
diff --git a/tests/FindModules/CMakeLists.txt b/tests/FindModules/CMakeLists.txt
--- a/tests/FindModules/CMakeLists.txt
+++ b/tests/FindModules/CMakeLists.txt
@@ -1,5 +1,5 @@
 project(FindModules)
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 file(GLOB all_find_modules
      RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}/../../find-modules"
diff --git a/tests/KDEFetchTranslations/CMakeLists.txt b/tests/KDEFetchTranslations/CMakeLists.txt
--- a/tests/KDEFetchTranslations/CMakeLists.txt
+++ b/tests/KDEFetchTranslations/CMakeLists.txt
@@ -1,5 +1,5 @@
 project(extra-cmake-modules)
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 # order is important (install dirs before cmake settings)!
 set(all_kde_modules
diff --git a/tests/KDEInstallDirsTest/relative_or_absolute/CMakeLists.txt b/tests/KDEInstallDirsTest/relative_or_absolute/CMakeLists.txt
--- a/tests/KDEInstallDirsTest/relative_or_absolute/CMakeLists.txt
+++ b/tests/KDEInstallDirsTest/relative_or_absolute/CMakeLists.txt
@@ -1,5 +1,5 @@
 project(KDEInstallDirs.relative_or_absolute)
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 set(ECM_KDE_MODULE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../../kde-modules)
 set(ECM_MODULE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../../modules)
diff --git a/tests/KDEInstallDirsTest/vars_in_sync/CMakeLists.txt b/tests/KDEInstallDirsTest/vars_in_sync/CMakeLists.txt
--- a/tests/KDEInstallDirsTest/vars_in_sync/CMakeLists.txt
+++ b/tests/KDEInstallDirsTest/vars_in_sync/CMakeLists.txt
@@ -1,5 +1,5 @@
 project(KDEInstallDirs.vars_in_sync)
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 set(ECM_KDE_MODULE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../../kde-modules)
 set(ECM_MODULE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../../modules)
diff --git a/tests/KDEPackageAppTemplatesTest/qml-plasmoid/CMakeLists.txt b/tests/KDEPackageAppTemplatesTest/qml-plasmoid/CMakeLists.txt
--- a/tests/KDEPackageAppTemplatesTest/qml-plasmoid/CMakeLists.txt
+++ b/tests/KDEPackageAppTemplatesTest/qml-plasmoid/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 project(plasma-%{APPNAMELC})
  
diff --git a/tests/UseFindModules/CMakeLists.txt b/tests/UseFindModules/CMakeLists.txt
--- a/tests/UseFindModules/CMakeLists.txt
+++ b/tests/UseFindModules/CMakeLists.txt
@@ -1,5 +1,5 @@
 project(UseFindModules)
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 set(ECM_FIND_MODULE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../../find-modules")
 set(ECM_MODULE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../../modules")