diff -Naur LuminanceHDR-v.2.6.1.1-original/CMakeLists.txt LuminanceHDR-v.2.6.1.1/CMakeLists.txt
--- LuminanceHDR-v.2.6.1.1-original/CMakeLists.txt	2021-01-11 04:41:28.000000000 -0500
+++ LuminanceHDR-v.2.6.1.1/CMakeLists.txt	2021-04-08 12:55:45.585941274 -0400
@@ -109,6 +109,9 @@
     get_git_head_revision(GIT_REFSPEC GIT_SHA1)
 ENDIF()
 
+find_package(PkgConfig)
+pkg_check_modules(RTPROCESS REQUIRED rtprocess>=0.2.0)
+
 IF(WIN32)
 
     # Windows Section