diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,8 +41,11 @@
 include(ECMInstallIcons)
 include(ECMPackageConfigHelpers)
 include(CheckIncludeFiles)
+include(CheckLibraryExists)
 include(ECMSetupVersion)
 
+check_library_exists(c clock_gettime "time.h" HAVE_CLOCK_GETTIME_C)
+
 ecm_setup_version(${PROJECT_VERSION}
                   VARIABLE_PREFIX KSYSGUARD
                   VERSION_HEADER "${CMAKE_CURRENT_BINARY_DIR}/ksysguard_version.h"
diff --git a/processui/CMakeLists.txt b/processui/CMakeLists.txt
--- a/processui/CMakeLists.txt
+++ b/processui/CMakeLists.txt
@@ -58,6 +58,10 @@
     target_link_libraries(processui PRIVATE Qt5::WebKitWidgets)
 endif()
 
+if(NOT HAVE_CLOCK_GETTIME_C)
+    target_link_libraries(processui PRIVATE rt)
+endif()
+
 set_target_properties(processui
    PROPERTIES VERSION ${KSYSGUARD_VERSION_STRING}
    SOVERSION ${KSYSGUARD_SOVERSION}