diff --git a/src/event.c b/src/event.c
index 0dde994f..6b730f6d 100644
--- a/src/event.c
+++ b/src/event.c
@@ -52,13 +52,8 @@ static int timeout_compare(const timeout_t *a, const timeout_t *b) {
 	return 0;
 }
 
-static int signal_compare(const signal_t *a, const signal_t *b) {
-	return a->signum - b->signum;
-}
-
 static splay_tree_t io_tree = {.compare = (splay_compare_t)io_compare};
 static splay_tree_t timeout_tree = {.compare = (splay_compare_t)timeout_compare};
-static splay_tree_t signal_tree = {.compare = (splay_compare_t)signal_compare};
 
 void io_add(io_t *io, io_cb_t cb, void *data, int fd, int flags) {
 	if(io->cb)
@@ -130,8 +125,13 @@ void timeout_del(timeout_t *timeout) {
 }
 
 #ifndef HAVE_MINGW
+static int signal_compare(const signal_t *a, const signal_t *b) {
+	return a->signum - b->signum;
+}
+
 static io_t signalio;
 static int pipefd[2] = {-1, -1};
+static splay_tree_t signal_tree = {.compare = (splay_compare_t)signal_compare};
 
 static void signal_handler(int signum) {
 	unsigned char num = signum;
diff --git a/src/mingw/device.c b/src/mingw/device.c
index d13b824a..aa059720 100644
--- a/src/mingw/device.c
+++ b/src/mingw/device.c
@@ -47,7 +47,7 @@ extern char *myport;
 
 static DWORD WINAPI tapreader(void *bla) {
 	int status;
-	long len;
+	DWORD len;
 	OVERLAPPED overlapped;
 	vpn_packet_t packet;
 
@@ -62,7 +62,7 @@ static DWORD WINAPI tapreader(void *bla) {
 		overlapped.OffsetHigh = 0;
 		ResetEvent(overlapped.hEvent);
 
-		status = ReadFile(device_handle, packet.data, MTU, &len, &overlapped);
+		status = ReadFile(device_handle, (void *)packet.data, MTU, &len, &overlapped);
 
 		if(!status) {
 			if(GetLastError() == ERROR_IO_PENDING) {
@@ -92,7 +92,7 @@ static bool setup_device(void) {
 	char adapterid[1024];
 	char adaptername[1024];
 	char tapname[1024];
-	long len;
+	DWORD len;
 	unsigned long status;
 
 	bool found = false;
@@ -123,7 +123,7 @@ static bool setup_device(void) {
 			continue;
 
 		len = sizeof adaptername;
-		err = RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);
+		err = RegQueryValueEx(key2, "Name", 0, 0, (LPBYTE)adaptername, &len);
 
 		RegCloseKey(key2);
 
@@ -223,7 +223,7 @@ static bool read_packet(vpn_packet_t *packet) {
 }
 
 static bool write_packet(vpn_packet_t *packet) {
-	long outlen;
+	DWORD outlen;
 	OVERLAPPED overlapped = {0};
 
 	logger(DEBUG_TRAFFIC, LOG_DEBUG, "Writing packet of %d bytes to %s",
diff --git a/src/multicast_device.c b/src/multicast_device.c
index bd9ef1db..e58d293e 100644
--- a/src/multicast_device.c
+++ b/src/multicast_device.c
@@ -165,7 +165,7 @@ static void close_device(void) {
 static bool read_packet(vpn_packet_t *packet) {
 	int lenin;
 
-	if((lenin = recv(device_fd, packet->data, MTU, 0)) <= 0) {
+	if((lenin = recv(device_fd, (void *)packet->data, MTU, 0)) <= 0) {
 		logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info,
 			   device, strerror(errno));
 		return false;
@@ -191,7 +191,7 @@ static bool write_packet(vpn_packet_t *packet) {
 	logger(DEBUG_TRAFFIC, LOG_DEBUG, "Writing packet of %d bytes to %s",
 			   packet->len, device_info);
 
-	if(sendto(device_fd, packet->data, packet->len, 0, ai->ai_addr, ai->ai_addrlen) < 0) {
+	if(sendto(device_fd, (void *)packet->data, packet->len, 0, ai->ai_addr, ai->ai_addrlen) < 0) {
 		logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device,
 			   strerror(errno));
 		return false;
diff --git a/src/names.c b/src/names.c
index 688e96d3..cc72a112 100644
--- a/src/names.c
+++ b/src/names.c
@@ -39,7 +39,7 @@ void make_names(void) {
 #ifdef HAVE_MINGW
 	HKEY key;
 	char installdir[1024] = "";
-	long len = sizeof installdir;
+	DWORD len = sizeof installdir;
 #endif
 
 	if(netname)
@@ -49,7 +49,7 @@ void make_names(void) {
 
 #ifdef HAVE_MINGW
 	if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
-		if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
+		if(!RegQueryValueEx(key, NULL, 0, 0, (LPBYTE)installdir, &len)) {
 			confdir = xstrdup(installdir);
 			if(!logfilename)
 				xasprintf(&logfilename, "%s" SLASH "log" SLASH "%s.log", installdir, identname);
diff --git a/src/net.c b/src/net.c
index 97b1e5df..0d374e6e 100644
--- a/src/net.c
+++ b/src/net.c
@@ -287,6 +287,7 @@ void handle_meta_connection_data(connection_t *c) {
 	}
 }
 
+#ifndef HAVE_MINGW
 static void sigterm_handler(void *data) {
 	logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(((signal_t *)data)->signum));
 	event_exit();
@@ -302,6 +303,7 @@ static void sigalrm_handler(void *data) {
 	logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(((signal_t *)data)->signum));
 	retry();
 }
+#endif
 
 int reload_configuration(void) {
 	char *fname;
diff --git a/src/net_socket.c b/src/net_socket.c
index cb2a6dfe..a28be54a 100644
--- a/src/net_socket.c
+++ b/src/net_socket.c
@@ -377,7 +377,7 @@ static void handle_meta_io(void *data, int flags) {
 
 		int result;
 		socklen_t len = sizeof result;
-		getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &result, &len);
+		getsockopt(c->socket, SOL_SOCKET, SO_ERROR, (void *)&result, &len);
 
 		if(!result)
 			finish_connecting(c);
diff --git a/src/process.c b/src/process.c
index 0f399e79..cbb190a5 100644
--- a/src/process.c
+++ b/src/process.c
@@ -259,8 +259,8 @@ bool execute_script(const char *name, char **envp) {
 		}
 	}
 
-#ifdef WEXITSTATUS
 	if(status != -1) {
+#ifdef WEXITSTATUS
 		if(WIFEXITED(status)) {          /* Child exited by itself */
 			if(WEXITSTATUS(status)) {
 				logger(DEBUG_ALWAYS, LOG_ERR, "Script %s exited with non-zero status %d",
@@ -275,11 +275,11 @@ bool execute_script(const char *name, char **envp) {
 			logger(DEBUG_ALWAYS, LOG_ERR, "Script %s terminated abnormally", name);
 			return false;
 		}
+#endif
 	} else {
 		logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "system", strerror(errno));
 		return false;
 	}
-#endif
 #endif
 	return true;
 }
diff --git a/src/tincd.c b/src/tincd.c
index 1feab407..8412c8f7 100644
--- a/src/tincd.c
+++ b/src/tincd.c
@@ -67,14 +67,18 @@ static bool show_version = false;
 /* If nonzero, use null ciphers and skip all key exchanges. */
 bool bypass_security = false;
 
+#ifdef HAVE_MLOCKALL
 /* If nonzero, disable swapping for this process. */
 static bool do_mlock = false;
+#endif
 
+#ifndef HAVE_MINGW
 /* If nonzero, chroot to netdir after startup. */
 static bool do_chroot = false;
 
 /* If !NULL, do setuid to given user after startup */
 static const char *switchuser = NULL;
+#endif
 
 /* If nonzero, write log entries to a separate file. */
 bool use_logfile = false;