Don't forget to install it!

--- src/filter/heatmap0r/CMakeLists.txt.orig	2025-10-07 14:15:56 UTC
+++ src/filter/heatmap0r/CMakeLists.txt
@@ -9,3 +9,5 @@ set_target_properties (${TARGET} PROPERTIES PREFIX "")
 
 # No «lib» prefix (name.so instead of libname.so)
 set_target_properties (${TARGET} PROPERTIES PREFIX "")
+
+install (TARGETS ${TARGET} LIBRARY DESTINATION ${LIBDIR})
