diff --git a/cmake/headers.cmake b/cmake/headers.cmake
index 1aad359..e5053ed 100644
--- a/cmake/headers.cmake
+++ b/cmake/headers.cmake
@@ -13,8 +13,6 @@ set(quickcpplib_HEADERS
   "include/quickcpplib/boost/test/unit_test.hpp"
   "include/quickcpplib/byte.hpp"
   "include/quickcpplib/byte/include/nonstd/byte.hpp"
-  "include/quickcpplib/byte/test/byte-main.t.hpp"
-  "include/quickcpplib/byte/test/lest_cpp03.hpp"
   "include/quickcpplib/config.hpp"
   "include/quickcpplib/console_colours.hpp"
   "include/quickcpplib/cpp_feature.h"
@@ -25,15 +23,8 @@ set(quickcpplib_HEADERS
   "include/quickcpplib/erasure_cast.hpp"
   "include/quickcpplib/execinfo_win64.h"
   "include/quickcpplib/function_ptr.hpp"
-  "include/quickcpplib/gsl-lite/gsl-lite.natvis"
   "include/quickcpplib/gsl-lite/include/gsl-lite/gsl-lite.hpp"
-  "include/quickcpplib/gsl-lite/include/gsl.h"
-  "include/quickcpplib/gsl-lite/include/gsl.hpp"
-  "include/quickcpplib/gsl-lite/include/gsl/gsl-lite-vc6.hpp"
-  "include/quickcpplib/gsl-lite/include/gsl/gsl-lite.h"
   "include/quickcpplib/gsl-lite/include/gsl/gsl-lite.hpp"
-  "include/quickcpplib/gsl-lite/test/gsl-lite.t.hpp"
-  "include/quickcpplib/gsl-lite/test/lest_cpp03.hpp"
   "include/quickcpplib/import.h"
   "include/quickcpplib/in_place_detach_attach.hpp"
   "include/quickcpplib/mem_flush_loads_stores.hpp"