--- a/src/CMakeLists.txt	Mon Nov 11 14:42:13 2019 +0100
+++ b/src/CMakeLists.txt	Sat Jan 11 00:56:51 2020 +0100
@@ -29,6 +29,7 @@
 # Executable output:
 add_executable(
 	${EXECUTABLE_FILE}
+	SubProcess.cpp
 	relpipe-in-filesystem.cpp
 )