diff -ruN a/cmake/BashCompletion.cmake d/cmake/BashCompletion.cmake
--- a/cmake/BashCompletion.cmake	2019-02-23 16:43:37.000000000 +0100
+++ d/cmake/BashCompletion.cmake	2019-04-19 00:21:17.721631142 +0200
@@ -78,15 +78,15 @@
   BASHCOMP_PKG_PATH=\"${BASHCOMP_PKG_PATH}\"\n\
 fi\n\
 echo -e \"\\nInstalling bash completion...\\n\"\n\
-mkdir -p \"\$BASHCOMP_PKG_PATH\"\n\
-cp \"${CMAKE_CURRENT_BINARY_DIR}/${SCRIPT_NAME}\" \"\$BASHCOMP_PKG_PATH\"\n\
-chmod a+r \"\$BASHCOMP_PKG_PATH/${SCRIPT_NAME}\"\n\
-echo -e \"Bash completion for ${SCRIPT_NAME} has been installed to \$BASHCOMP_PKG_PATH/${SCRIPT_NAME}\"\n\
+mkdir -p \"\${DESTDIR}/$BASHCOMP_PKG_PATH\"\n\
+cp \"${CMAKE_CURRENT_BINARY_DIR}/${SCRIPT_NAME}\" \"\${DESTDIR}/$BASHCOMP_PKG_PATH\"\n\
+chmod a+r \"\${DESTDIR}/$BASHCOMP_PKG_PATH/${SCRIPT_NAME}\"\n\
+echo -e \"Bash completion for ${SCRIPT_NAME} has been installed to \${DESTDIR}/$BASHCOMP_PKG_PATH/${SCRIPT_NAME}\"\n\
 ")
 		INSTALL(CODE "EXECUTE_PROCESS(COMMAND chmod u+x \"install_${SCRIPT_NAME}_completion.sh\" WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR} )")
 		INSTALL(CODE "EXECUTE_PROCESS(COMMAND \"./install_${SCRIPT_NAME}_completion.sh\" WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR} )")
 
-		MESSAGE(STATUS "Bash completion script for ${SCRIPT_NAME} will be installed to ${BASHCOMP_PKG_PATH} or fallback to ${BASHCOMP_USER_PATH} if unwritable.")
+    MESSAGE(STATUS "Bash completion script for ${SCRIPT_NAME} will be installed to ${DESTDIR}/${BASHCOMP_PKG_PATH} or fallback to ${BASHCOMP_USER_PATH} if unwritable.")
 	ENDMACRO()
 ENDIF()