--- Makefile.orig	2022-01-22 08:51:28 UTC
+++ Makefile
@@ -251,10 +251,13 @@ endif
 # Systemwide installation.
 ifeq ($(WITH_SYSTEMWIDE),yes)
 override CFLAGS += -DSYSTEMWIDE
-ifneq ($(WITH_SYSTEMDIR),"")
-override CFLAGS += -DSYSTEMDIR=\"$(WITH_SYSTEMDIR)\"
+ifneq ($(WITH_SYSTEMDATADIR),"")
+override CFLAGS += -DSYSTEMDATADIR=\"$(WITH_SYSTEMDATADIR)\"
 endif
+ifneq ($(WITH_SYSTEMLIBDIR),"")
+override CFLAGS += -DSYSTEMLIBDIR=\"$(WITH_SYSTEMLIBDIR)\"
 endif
+endif
 
 # ----------
 
@@ -405,7 +408,8 @@ config:
 	@echo "WITH_OPENAL = $(WITH_OPENAL)"
 	@echo "WITH_RPATH = $(WITH_RPATH)"
 	@echo "WITH_SYSTEMWIDE = $(WITH_SYSTEMWIDE)"
-	@echo "WITH_SYSTEMDIR = $(WITH_SYSTEMDIR)"
+	@echo "WITH_SYSTEMDATADIR = $(WITH_SYSTEMDATADIR)"
+	@echo "WITH_SYSTEMLIBDIR = $(WITH_SYSTEMLIBDIR)"
 	@echo "============================"
 	@echo ""