diff --git a/CMakeLists.txt b/CMakeLists.txt
index a7d83d4..f162092 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,6 +19,7 @@ set( TQT_VERSION "${TQT_MAJOR_VERSION}.${TQT_MINOR_VERSION}.${TQT_MICRO_VERSION}
 
 ##### include essential cmake modules ###########
 
+include( FindPkgConfig )
 include( CheckCXXSourceCompiles )