diff --git a/ConfigureChecks.cmake b/ConfigureChecks.cmake
index 2f6cb2a..29f3e03 100644
--- a/ConfigureChecks.cmake
+++ b/ConfigureChecks.cmake
@@ -37,3 +37,26 @@ pkg_search_module( QALCULATE libqalculate )
 if( NOT QALCULATE_FOUND )
    tde_message_fatal( "libqalculate is required but was not found on your system." )
 endif( NOT QALCULATE_FOUND )
+
+
+##### check if libqalculate requires explicitly link libcln
+
+tde_save( CMAKE_REQUIRED_INCLUDES CMAKE_REQUIRED_LIBRARIES )
+set( CMAKE_REQUIRED_INCLUDES ${QALCULATE_INCLUDE_DIRS} )
+set( CMAKE_REQUIRED_LIBRARIES ${QALCULATE_LIBRARIES} )
+
+check_cxx_source_compiles("
+	#include <libqalculate/qalculate.h>
+	int main(int argc, char **argv) { Number n; return 0; } "
+	QALCULATE_LIBRARIES_WORKS
+)
+if( NOT QALCULATE_LIBRARIES_WORKS )
+  pkg_search_module( CLN cln )
+  if( NOT CLN_FOUND )
+     tde_message_fatal( "libqalculate require CLN library but it was not found on your system." )
+  endif( NOT CLN_FOUND )
+  list( APPEND QALCULATE_LIBRARIES ${CLN_LIBRARIES} )
+  message( STATUS "Added CLN_LIBRARIES to QALCULATE_LIBRARIES" )
+endif( )
+
+tde_restore( CMAKE_REQUIRED_INCLUDES CMAKE_REQUIRED_LIBRARIES )