--- a/configure.ac
+++ b/configure.ac
@@ -1109,7 +1109,7 @@
 fi
 
 if test -n "$GCC"; then
-    CFLAGS="$CFLAGS -Wall"
+    CFLAGS="$CFLAGS -Wall -Wno-unused-but-set-variable"
 fi
 
 echo $CFLAGS > cflags.out
--- a/src/spooler.c
+++ b/src/spooler.c
@@ -41,7 +41,10 @@
 #include "unified2.h"
 #include "util.h"
 
-
+/**
+ * Missing signature for function defined in decider.c
+ */
+int DecodePacket(int linktype, Packet *p, const struct pcap_pkthdr *pkthdr, const uint8_t *pkt);
 
 /*
 ** PRIVATE FUNCTIONS
--- a/src/decode.c
+++ b/src/decode.c
@@ -81,8 +81,10 @@
     }
 }
 
-int DecodePacket(int linktype, Packet *p, const struct DAQ_PktHdr_t *pkthdr, const uint8_t *pkt)
+int DecodePacket(int linktype, Packet *p, const struct pcap_pkthdr *_pkthdr, const uint8_t *pkt)
 {
+    // valid cast as below code only references fields in 'struct pcap_pkthdr'
+    const DAQ_PktHdr_t* pkthdr = (const DAQ_PktHdr_t*)_pkthdr;
     DEBUG_WRAP(DebugMessage(DEBUG_DECODE,"Decoding linktype %d\n",linktype););
     switch(linktype)
     {
--- a/src/output-plugins/spo_log_tcpdump.c
+++ b/src/output-plugins/spo_log_tcpdump.c
@@ -358,10 +357,7 @@
     }
 }
 
-static INLINE size_t SizeOf (const struct pcap_pkthdr *pkth)
-{
-    return PCAP_PKT_HDR_SZ + pkth->caplen;
-}
+#define SizeOf(pkth) (PCAP_PKT_HDR_SZ + pkth->caplen)
 
 static void LogTcpdumpSingle(Packet *p, void *event, uint32_t event_type, void *arg)
 {
@@ -388,7 +384,7 @@
 //    else if ( data->size + dumpSize > data->limit )
 //        TcpdumpRollLogFile(data);
 
-    pcap_dump((u_char *)data->dumpd, p->pkth, p->pkt);
+    pcap_dump((u_char *)data->dumpd, (const struct pcap_pkthdr *)p->pkth, p->pkt);
     data->size += dumpSize;
 
     if (!BcLineBufferedLogging())
--- a/src/output-plugins/spo_database_cache.c
+++ b/src/output-plugins/spo_database_cache.c
@@ -5298,7 +5298,7 @@
 	{
 	    sigSeq = cacheLookup->obj.db_sig_id;
 	    databasemaxSeq = 0;
-	    memset(sigRefArr,'\0',MAX_REF_OBJ);
+	    memset(sigRefArr,'\0',MAX_REF_OBJ * sizeof(u_int32_t));
 	}
 	
 	if(dbSignatureReferenceLookup(&cacheLookup->obj,tempCache,&rNode,1))
--- a/src/output-plugins/spo_alert_unixsock.c
+++ b/src/output-plugins/spo_alert_unixsock.c
@@ -251,8 +251,9 @@
 		 alertpkt.pkth.caplen > PKT_SNAPLEN ? PKT_SNAPLEN : alertpkt.pkth.caplen);
     }
     else
+    {
         alertpkt.val|=NOPACKET_STRUCT;
-
+    }
 	sn = GetSigByGidSid(ntohl(((Unified2EventCommon *)event)->generator_id),
 			    ntohl(((Unified2EventCommon *)event)->signature_id),
 			    ntohl(((Unified2EventCommon *)event)->signature_revision));