diff -ruN libwebp-1.5.0/config.sub libwebp-1.5.0-banan_os/config.sub
--- libwebp-1.5.0/config.sub	2024-12-20 03:52:53.000000000 +0200
+++ libwebp-1.5.0-banan_os/config.sub	2025-06-11 12:46:06.199497350 +0300
@@ -1754,7 +1754,7 @@
 	     | onefs* | tirtos* | phoenix* | fuchsia* | redox* | bme* \
 	     | midnightbsd* | amdhsa* | unleashed* | emscripten* | wasi* \
 	     | nsk* | powerunix* | genode* | zvmoe* | qnx* | emx* | zephyr* \
-	     | fiwix* )
+	     | fiwix* | banan_os* )
 		;;
 	# This one is extra strict with allowed versions
 	sco3.2v2 | sco3.2v[4-9]* | sco5v6*)