diff --git a/makefile b/makefile
index 33d3a8e..0a661f8 100755
--- a/makefile
+++ b/makefile
@@ -8,8 +8,7 @@ SRC=src
 # with debug:
 #CFLAGS:= $(CFLAGS) -O3 -Wall -g
 
-CFLAGS:= $(CFLAGS) -O3 -Wall
-
+CFLAGS:= $(CFLAGS) -std=c11 -O3 -Wall -D_POSIX_C_SOURCE
 all: objdir imgcomp
 
 objdir:
diff --git a/src/compare.c b/src/compare.c
index 8749abf..d3a4d0c 100755
--- a/src/compare.c
+++ b/src/compare.c
@@ -10,6 +10,7 @@
 #include <stddef.h>
 #include <stdlib.h>
 #include <memory.h>
+#include <time.h>
 #include "imgcomp.h"
 #include "config.h"
 
diff --git a/src/compare_util.c b/src/compare_util.c
index b8c274d..1a2bcd0 100755
--- a/src/compare_util.c
+++ b/src/compare_util.c
@@ -10,6 +10,7 @@
 #include <stddef.h>
 #include <stdlib.h>
 #include <memory.h>
+#include <time.h>
 #include "imgcomp.h"
 #include "config.h"
 
diff --git a/src/config.c b/src/config.c
index 182b6d4..96dc2e7 100755
--- a/src/config.c
+++ b/src/config.c
@@ -8,6 +8,7 @@
 #include <ctype.h>		// to declare isupper(), tolower() 
 #include <stdlib.h>
 #include <string.h>
+#include <time.h>
 
 #include "imgcomp.h"
 #include "config.h"
diff --git a/src/send_udp.c b/src/send_udp.c
index 95f4358..d8f3ab7 100755
--- a/src/send_udp.c
+++ b/src/send_udp.c
@@ -1,190 +1,182 @@
-//----------------------------------------------------------------------------------
-// Module for sending UDP notifcations to stepper program, 
-// for aming heater, fan, or cap shooter at kids and squirrels.
-//----------------------------------------------------------------------------------
-#include <stdio.h>
-#include <stdlib.h>
-#include "imgcomp.h"
-
-#ifdef _WIN32
-    #define WIN32_LEAN_AND_MEAN // To keep windows.h bloat down.    
-    #ifdef OLD_WINSOCK
-        #include <winsock.h>
-    #else
-        #include <winsock2.h>
-    #endif
-    #include <conio.h>
-#else
-    #include <sys/types.h>
-    #include <sys/socket.h>
-    #include <netinet/in.h>
-    #include <arpa/inet.h>
-    #include <linux/net.h>
-    #include <netdb.h>
-    #include <unistd.h>
-    #include <memory.h>
-    typedef unsigned char BYTE;
-    typedef unsigned char UCHAR;
-    typedef unsigned short USHORT;
-    typedef unsigned long ULONG;
-    typedef int SOCKET;
-    typedef int BOOL;
-    #define FALSE 0
-    #define TRUE 1
-    #define SOCKET_ERROR -1
-    #define INVALID_SOCKET -1
-    typedef fd_set FD_SET;
-    typedef struct timeval TIMEVAL;
-#endif
-
-
-
-#define MAGIC_ID 0xf581     // Magic value to identify pings from this program.
-#define MAGIC_PORTNUM 7777   // Magic port number for UDP pings (this is the port Joe picked for his app)
-#define UDP_MAGIC 0x46c1
-
-//-------------------------------------------------------------------------------------
-// Structure for a test UDP packet.
-typedef struct {
-    int Ident;
-    int Level;
-    int xpos;
-    int ypos;
-    int IsAdjust;
-	int Motion;
-}Udp_t;
-
-//-------------------------------------------------------------------------------------
-
-#define STATUS_FAILED 0xFFFF
-
-struct sockaddr_in dest;
-static SOCKET sockUDP;
-
-//--------------------------------------------------------------------------
-// Form and send a UDP packet
-//--------------------------------------------------------------------------
-void SendUDP(int x, int y, int level, int motion)
-{
-    int wrote;
-    int datasize;
-    Udp_t Buf;
-    
-    if (!dest.sin_port){
-        fprintf(stderr, "UDP not initialized\n");
-		return;
-    }
-    
-    memset(&Buf, 0, sizeof(Buf));
-
-    Buf.Ident = UDP_MAGIC;
-    Buf.Level = level;
-	Buf.Motion = motion;
-    Buf.xpos = x;
-    Buf.ypos = y;
-    Buf.IsAdjust = 0;
-
-    datasize = sizeof(Udp_t);
-
-    wrote = sendto(sockUDP,(char *)&Buf, datasize, 0,(struct sockaddr*)&dest, sizeof(struct sockaddr_in));
-
-    if (wrote == SOCKET_ERROR){
-        perror("UDP sendto failed");
-
-        #ifndef _WIN32
-            printf("On Linux, This eventually happens if the destination port is unreacable and Uping is not root\n");
-        #endif
-        exit(-1);
-    }
-    if (wrote < datasize ) {
-        fprintf(stdout,"Wrote %d bytes of %d\n",wrote, datasize);
-    }
-
-    //printf("Sent UDP packet, x=%d\n",x);
-}
-
-//--------------------------------------------------------------------------
-// Main
-//--------------------------------------------------------------------------
-int InitUDP(char * HostName)
-{
-    #ifdef _WIN32
-        WSADATA wsaData;
-    #endif
-
-    struct hostent * hp;
-    unsigned int addr=0;
-    unsigned short PortNum = MAGIC_PORTNUM; // Use a different port, leave this for listener
-
-    //-------------------------------------------------------------------
-    // Resolve the remote address
-    printf("Init UDP to %s",HostName);
-
-    memset(&dest,0,sizeof(struct sockaddr_in));
-
-    if (HostName){
-        hp = gethostbyname(HostName);
-
-        if (hp == NULL){
-            // If address is not a host name, assume its a x.x.x.x format address.
-            addr = inet_addr(HostName);
-            if (addr == INADDR_NONE) {
-                // Not a number format address either.  Give up.
-                fprintf(stderr,"Unable to resolve %s\n",HostName);
-                exit(-1);
-            }
-            dest.sin_addr.s_addr = addr;
-            dest.sin_family = AF_INET;
-
-        }else{
-            // Resolved to a host name.
-            memcpy(&(dest.sin_addr),hp->h_addr,hp->h_length);
-            dest.sin_family = hp->h_addrtype;
-        }
-    }else{
-        // No host name specified.  Use loopback address by default.
-        printf("No host name specified.  Using 'loopback' as target\n");
-        addr = inet_addr("127.0.0.1");
-        dest.sin_addr.s_addr = addr;
-        dest.sin_family = AF_INET;
-    }
-
-    dest.sin_port = htons(PortNum); 
-
-    //-------------------------------------------------------------------
-    // Open socket for reception of regular UDP packets.
-    {
-        struct sockaddr_in local;
-
-    	local.sin_family = AF_INET;
-	    local.sin_addr.s_addr = INADDR_ANY;
-
-      	local.sin_port = htons(PortNum+2);
-        sockUDP = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
-
-        if (sockUDP == INVALID_SOCKET){
-            perror("couldn't create UDP socket");
-            exit(-1);
-        }
-
-    	if (bind(sockUDP,(struct sockaddr*)&local,sizeof(local) ) == SOCKET_ERROR) {
-    	    #ifdef _WIN32
-                int err;
-                err = WSAGetLastError();
-                if (err != WSAEADDRINUSE){
-    		        perror("bind() failed with error");
-            		WSACleanup();
-                    exit(-1);
-                }else{
-                    printf("Listen port already in use\n");
-                }
-            #else
-                perror("bind failed");
-                exit(-1);
-            #endif
-    	}
-    }
-
-    return 0;
-}
-
+//----------------------------------------------------------------------------------
+// Module for sending UDP notifcations to stepper program,
+// for aming heater, fan, or cap shooter at kids and squirrels.
+//----------------------------------------------------------------------------------
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <linux/net.h>
+#include <netdb.h>
+#include <unistd.h>
+#include <memory.h>
+#include <sys/select.h>
+#include <time.h>
+
+#include "imgcomp.h"
+typedef unsigned char BYTE;
+typedef unsigned char UCHAR;
+typedef unsigned short USHORT;
+typedef unsigned long ULONG;
+typedef int SOCKET;
+typedef int BOOL;
+#define FALSE 0
+#define TRUE 1
+#define SOCKET_ERROR -1
+#define INVALID_SOCKET -1
+typedef fd_set FD_SET;
+typedef struct timeval TIMEVAL;
+#define h_addr h_addr_list[0]
+
+
+#define MAGIC_ID 0xf581     // Magic value to identify pings from this program.
+#define MAGIC_PORTNUM 7777   // Magic port number for UDP pings (this is the port Joe picked for his app)
+#define UDP_MAGIC 0x46c1
+
+//-------------------------------------------------------------------------------------
+// Structure for a test UDP packet.
+typedef struct {
+    int Ident;
+    int Level;
+    int xpos;
+    int ypos;
+    int IsAdjust;
+    int Motion;
+}Udp_t;
+
+//-------------------------------------------------------------------------------------
+
+#define STATUS_FAILED 0xFFFF
+
+struct sockaddr_in dest;
+static SOCKET sockUDP;
+
+//--------------------------------------------------------------------------
+// Form and send a UDP packet
+//--------------------------------------------------------------------------
+void SendUDP(int x, int y, int level, int motion)
+{
+    int wrote;
+    int datasize;
+    Udp_t Buf;
+
+    if (!dest.sin_port){
+        fprintf(stderr, "UDP not initialized\n");
+        return;
+    }
+
+    memset(&Buf, 0, sizeof(Buf));
+
+    Buf.Ident = UDP_MAGIC;
+    Buf.Level = level;
+    Buf.Motion = motion;
+    Buf.xpos = x;
+    Buf.ypos = y;
+    Buf.IsAdjust = 0;
+
+    datasize = sizeof(Udp_t);
+
+    wrote = sendto(sockUDP,(char *)&Buf, datasize, 0,(struct sockaddr*)&dest, sizeof(struct sockaddr_in));
+
+    if (wrote == SOCKET_ERROR){
+        perror("UDP sendto failed");
+
+        #ifndef _WIN32
+            printf("On Linux, This eventually happens if the destination port is unreacable and Uping is not root\n");
+        #endif
+        exit(-1);
+    }
+    if (wrote < datasize ) {
+        fprintf(stdout,"Wrote %d bytes of %d\n",wrote, datasize);
+    }
+
+    //printf("Sent UDP packet, x=%d\n",x);
+}
+
+//--------------------------------------------------------------------------
+// Main
+//--------------------------------------------------------------------------
+int InitUDP(char * HostName)
+{
+    #ifdef _WIN32
+        WSADATA wsaData;
+    #endif
+
+    struct hostent * hp;
+    unsigned int addr=0;
+    unsigned short PortNum = MAGIC_PORTNUM; // Use a different port, leave this for listener
+
+    //-------------------------------------------------------------------
+    // Resolve the remote address
+    printf("Init UDP to %s",HostName);
+
+    memset(&dest,0,sizeof(struct sockaddr_in));
+
+    if (HostName){
+        hp = gethostbyname(HostName);
+
+        if (hp == NULL){
+            // If address is not a host name, assume its a x.x.x.x format address.
+            addr = inet_addr(HostName);
+            if (addr == INADDR_NONE) {
+                // Not a number format address either.  Give up.
+                fprintf(stderr,"Unable to resolve %s\n",HostName);
+                exit(-1);
+            }
+            dest.sin_addr.s_addr = addr;
+            dest.sin_family = AF_INET;
+
+        }else{
+            // Resolved to a host name.
+            memcpy(&(dest.sin_addr),hp->h_addr,hp->h_length);
+            dest.sin_family = hp->h_addrtype;
+        }
+    }else{
+        // No host name specified.  Use loopback address by default.
+        printf("No host name specified.  Using 'loopback' as target\n");
+        addr = inet_addr("127.0.0.1");
+        dest.sin_addr.s_addr = addr;
+        dest.sin_family = AF_INET;
+    }
+
+    dest.sin_port = htons(PortNum);
+
+    //-------------------------------------------------------------------
+    // Open socket for reception of regular UDP packets.
+    {
+        struct sockaddr_in local;
+
+        local.sin_family = AF_INET;
+        local.sin_addr.s_addr = INADDR_ANY;
+
+        local.sin_port = htons(PortNum+2);
+        sockUDP = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+
+        if (sockUDP == INVALID_SOCKET){
+            perror("couldn't create UDP socket");
+            exit(-1);
+        }
+
+        if (bind(sockUDP,(struct sockaddr*)&local,sizeof(local) ) == SOCKET_ERROR) {
+            #ifdef _WIN32
+                int err;
+                err = WSAGetLastError();
+                if (err != WSAEADDRINUSE){
+                    perror("bind() failed with error");
+                    WSACleanup();
+                    exit(-1);
+                }else{
+                    printf("Listen port already in use\n");
+                }
+            #else
+                perror("bind failed");
+                exit(-1);
+            #endif
+        }
+    }
+
+    return 0;
+}
+