From: Maciej Krüger <mkg20001@gmail.com>
Date: Mon, 2 Jan 2023 01:45:37 +0100
Subject: oonf-olsrd2: fix building with multiple plugins

Code to replace colons wasn't working (debian stable)
Took it from stackoverflow, works now

diff --git a/oonf-olsrd2/Makefile b/oonf-olsrd2/Makefile
index 40190edb72547587bc53bb3bee150398b7413aa2..6067003a846340fb0e6221c2473959480b12fb4b 100644
--- a/oonf-olsrd2/Makefile
+++ b/oonf-olsrd2/Makefile
@@ -17,8 +17,8 @@ CMAKE_INSTALL:=1
 include $(INCLUDE_DIR)/package.mk
 include $(INCLUDE_DIR)/cmake.mk
 
-SPACE:=
-SPACE+=
+# ref https://stackoverflow.com/a/10571900/3990041
+SPACE:= $(subst ,, )
 CMAKE_OPTIONAL_PLUGINS:= $(subst $(SPACE),;,$(strip \
         $(if $(filter y,$(CONFIG_OONF_NHDP_AUTOLL4)),auto_ll4,) \
         $(if $(filter y,$(CONFIG_OONF_OLSRV2_LAN_IMPORT)),lan_import,) \