diff -udHrN -- a/configure.ac b/configure.ac
--- a/configure.ac 2022-05-13 13:28:38.000000000 +0200
+++ b/configure.ac 2022-05-21 09:08:38.158557876 +0200
@@ -172,7 +172,7 @@
[OPENCV_LIBS="-lopencv_core -lopencv_imgproc -lopencv_calib3d"],
[PKG_CHECK_MODULES([OPENCV], [opencv4 >= 4.2.0],
[AC_MSG_WARN([OpenCV 4.2 found, translation-only registration will be disabled - requires 4.4])]
- [OPENCV_LIBS="-lopencv_core -lopencv_imgproc -lopencv_calib3d"],
+ [OPENCV_LIBS="-lopencv_core -lopencv_imgproc -lopencv_calib3d -lopencv_flann"],
AC_MSG_ERROR([opencv not found.]))])
else
AC_MSG_ERROR([no C++ compiler found])