diff --git a/rtengine/CMakeLists.txt b/rtengine/CMakeLists.txt
index 43efafeeb..6538ecc61 100644
--- a/rtengine/CMakeLists.txt
+++ b/rtengine/CMakeLists.txt
@@ -12,6 +12,11 @@ include_directories(${EXTRA_INCDIR}
     ${LENSFUN_INCLUDE_DIRS}
     ${RSVG_INCLUDE_DIRS}
 )
+if(NOT WITH_SYSTEM_KLT)
+    include_directories("${CMAKE_SOURCE_DIR}/rtengine/klt")
+else()
+    include_directories(${KLT_INCLUDE_DIRS})
+endif()
 
 link_directories("${PROJECT_SOURCE_DIR}/rtexif"
     ${EXPAT_LIBRARY_DIRS}
@@ -187,6 +192,7 @@ target_link_libraries(rtengine rtexif
     ${ZLIB_LIBRARIES}
     ${LENSFUN_LIBRARIES}
     ${RSVG_LIBRARIES}
+    ${KLT_LIBRARIES}
 )
 
 install(FILES ${CAMCONSTSFILE} DESTINATION "${DATADIR}" PERMISSIONS OWNER_WRITE OWNER_READ GROUP_READ WORLD_READ)
diff --git a/rtengine/calc_distort.cc b/rtengine/calc_distort.cc
index 7af47adb2..3a7a4a1c4 100644
--- a/rtengine/calc_distort.cc
+++ b/rtengine/calc_distort.cc
@@ -5,8 +5,8 @@ locations (before and after tracking) to text files and to PPM files,
 and prints the features to the screen.
 **********************************************************************/
 
-#include "klt/pnmio.h"
-#include "klt/klt.h"
+#include <pnmio.h>
+#include <klt.h>
 #include <cmath>
 #include <cstring>
 
diff --git a/rtengine/canon_cr3_decoder.cc b/rtengine/canon_cr3_decoder.cc
index 6274154cb..d9a10900c 100644
--- a/rtengine/canon_cr3_decoder.cc
+++ b/rtengine/canon_cr3_decoder.cc
@@ -18,6 +18,7 @@
  */
 
 // Code adapted from ART
+// https://bitbucket.org/agriggio/art/
 /*
  *
  *  This file is part of ART.
@@ -37,11 +38,16 @@
 */
 
 // Code adapted from libraw
-/* -*- C++ -*-
- * Copyright 2019 LibRaw LLC (info@libraw.org)
+// https://github.com/LibRaw/LibRaw/
+/*
+ * File: libraw_crxdec.cpp
+ * Copyright (C) 2018-2019 Alexey Danilchenko
+ * Copyright (C) 2019 Alex Tutubalin, LibRaw LLC
  *
- LibRaw is free software; you can redistribute it and/or modify
- it under the terms of the one of two licenses as you choose:
+   Canon CR3 file decoder
+
+LibRaw is free software; you can redistribute it and/or modify
+it under the terms of the one of two licenses as you choose:
 
 1. GNU LESSER GENERAL PUBLIC LICENSE version 2.1
    (See file LICENSE.LGPL provided in LibRaw distribution archive for details).
@@ -49,7 +55,7 @@
 2. COMMON DEVELOPMENT AND DISTRIBUTION LICENSE (CDDL) Version 1.0
    (See file LICENSE.CDDL provided in LibRaw distribution archive for details).
 
-*/
+ */
 
 #include <algorithm>
 #include <cstdint>