Taken from: https://sources.debian.org/patches/pnm2ppa/1.13-10/0005-Declare-syslog_message-correctly-for-GCC-10-FTBFS.patch
Author: Zdenek Dohnal <zdohnal@redhat.com>
--- a/ppa_syslog.h
+++ b/ppa_syslog.h
@@ -39,7 +39,7 @@
 #include <syslog.h>
 #endif
 
-char syslog_message[128];
+extern char syslog_message[128];
 extern size_t message_size ;
 
 void wrap_syslog( int, char *, char *);
diff --git a/syslog.c b/syslog.c
index 9b11c55..dccab91 100644
--- a/syslog.c
+++ b/syslog.c
@@ -31,6 +31,8 @@
 #include "ppa_syslog.h"
 #include "global.h"
 
+char syslog_message[128];
+
 BOOLEAN verbose = false ;
 
 /*