diff --git a/CMakeLists.txt b/CMakeLists.txt
index 631da056..e7c4de61 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -56,14 +56,19 @@ macro(copy_files_to_build_dir target dlllist_var)
 	endif()
 endmacro()
 
-# 64-bit check
-message(STATUS "CMAKE_SIZEOF_VOID_P=" ${CMAKE_SIZEOF_VOID_P})
+# bitness check
+set(SRB2_SYSTEM_BITS 0)
 if(CMAKE_SIZEOF_VOID_P EQUAL 8)
 	message(STATUS "Target is 64-bit")
 	set(SRB2_SYSTEM_BITS 64)
-else()
+endif()
+if(CMAKE_SIZEOF_VOID_P EQUAL 4)
+	message(STATUS "Target is 32-bit")
 	set(SRB2_SYSTEM_BITS 32)
 endif()
+if(${SRB2_SYSTEM_BITS} EQUAL 0)
+	message(STATUS "Target bitness is unknown")
+endif()
 
 # OS macros
 if (UNIX)
diff --git a/src/i_tcp.c b/src/i_tcp.c
index f8a65b75..11a84ceb 100644
--- a/src/i_tcp.c
+++ b/src/i_tcp.c
@@ -612,7 +612,7 @@ static boolean SOCK_Get(void)
 		if (c != ERRSOCKET)
 		{
 			// find remote node number
-			for (j = 0; j <= MAXNETNODES; j++) //include LAN
+			for (j = 1; j <= MAXNETNODES; j++) //include LAN
 			{
 				if (SOCK_cmpaddr(&fromaddress, &clientaddress[j], 0))
 				{
@@ -1340,8 +1340,12 @@ static SINT8 SOCK_NetMakeNodewPort(const char *address, const char *port)
 	while (runp != NULL)
 	{
 		// find ip of the server
-		memcpy(&clientaddress[newnode], runp->ai_addr, runp->ai_addrlen);
-		runp = NULL;
+		if (sendto(mysockets[0], NULL, 0, 0, runp->ai_addr, runp->ai_addrlen) == 0)
+		{
+			memcpy(&clientaddress[newnode], runp->ai_addr, runp->ai_addrlen);
+			break;
+		}
+		runp = runp->ai_next;
 	}
 	I_freeaddrinfo(ai);
 	return newnode;
diff --git a/src/w_wad.c b/src/w_wad.c
index 9829e517..91570184 100644
--- a/src/w_wad.c
+++ b/src/w_wad.c
@@ -1187,23 +1187,17 @@ void zerr(int ret)
 #define NO_PNG_LUMPS
 
 #ifdef NO_PNG_LUMPS
-static void ErrorIfPNG(void *d, size_t s, char *f, char *l)
+static void ErrorIfPNG(UINT8 *d, size_t s, char *f, char *l)
 {
     if (s < 67) // http://garethrees.org/2007/11/14/pngcrush/
         return;
-#define sigcheck ((UINT8 *)d)
-    if (sigcheck[0] == 0x89
-        && sigcheck[1] == 0x50
-        && sigcheck[2] == 0x4e
-        && sigcheck[3] == 0x47
-        && sigcheck[4] == 0x0d
-        && sigcheck[5] == 0x0a
-        && sigcheck[6] == 0x1a
-        && sigcheck[7] == 0x0a)
+    // Check for PNG file signature using memcmp
+    // As it may be faster on CPUs with slow unaligned memory access
+    // Ref: http://www.libpng.org/pub/png/spec/1.2/PNG-Rationale.html#R.PNG-file-signature
+    if (memcmp(&d[0], "\x89\x50\x4e\x47\x0d\x0a\x1a\x0a", 8) == 0)
     {
         I_Error("W_Wad: Lump \"%s\" in file \"%s\" is a .PNG - please convert to either Doom or Flat (raw) image format.", l, f);
     }
-#undef sigcheck
 }
 #endif
 
@@ -1297,6 +1291,7 @@ size_t W_ReadLumpHeaderPwad(UINT16 wad, UINT16 lump, void *dest, size_t size, si
 			//I_Error("ZWAD files not supported on this platform.");
 			return 0;
 #endif
+
 		}
 #ifdef HAVE_ZLIB
 	case CM_DEFLATE: // Is it compressed via DEFLATE? Very common in ZIPs/PK3s, also what most doom-related editors support.