Description: Don't hardcode default gcc version (i.e. don't override $CC if set)
 Avoids compilation failures with older kernels which can't be
 compiled with the current gcc, e.g. 5.7 needs gcc-9 instead of the
 current gcc-10 (where the gcc symlink points to).
Author: Axel Beckert <abe@debian.org>
Forwarded: no

--- a/Makefile.in
+++ b/Makefile.in
@@ -13,7 +13,7 @@
 SNMPTGSO = /usr/lib/snmp/dlmod/snmp_NETFLOW.so
 SNMPCONF = /etc/snmp/snmpd.conf
 SNMPLINE = dlmod netflow $(SNMPTGSO)
-CC = gcc
+CC ?= gcc
 
 # https://www.kernel.org/doc/Documentation/kbuild/modules.txt
 # https://www.kernel.org/doc/Documentation/kbuild/makefiles.txt