Index: /trunk/FACT++/CMakeLists.txt
===================================================================
--- /trunk/FACT++/CMakeLists.txt	(revision 19170)
+++ /trunk/FACT++/CMakeLists.txt	(revision 19171)
@@ -408,4 +408,5 @@
 MACRO(MANPAGE program description)
 # https://samthursfield.wordpress.com/2015/11/21/cmake-dependencies-between-targets-and-files-and-custom-commands/
+IF (HELP2MAN_EXECUTABLE AND GROFF_EXECUTABLE)
         ADD_CUSTOM_COMMAND(
         	OUTPUT
@@ -434,5 +435,5 @@
 
 	INSTALL(FILES ${PROJECT_BINARY_DIR}/man1/${program}.1 DESTINATION "${CMAKE_INSTALL_MANDIR}/man1")
-
+ENDIF()
 ENDMACRO()