--- zzzz-none-000/linux-3.10.107/sound/drivers/opl4/Makefile	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/sound/drivers/opl4/Makefile	2021-02-04 17:41:59.000000000 +0000
@@ -3,7 +3,8 @@
 # Copyright (c) 2001 by Jaroslav Kysela <perex@perex.cz>
 #
 
-snd-opl4-lib-objs := opl4_lib.o opl4_mixer.o opl4_proc.o
+snd-opl4-lib-objs := opl4_lib.o opl4_mixer.o
+snd-opl4-lib-$(CONFIG_SND_PROC_FS) += opl4_proc.o
 snd-opl4-synth-objs := opl4_seq.o opl4_synth.o yrw801.o
 
 obj-$(CONFIG_SND_OPL4_LIB) += snd-opl4-lib.o