diff --git a/SetFlags.cmake b/SetFlags.cmake
index d3a7801ee..869307d91 100644
--- a/SetFlags.cmake
+++ b/SetFlags.cmake
@@ -88,6 +88,11 @@ function(set_global_flags)
 
 		# Make build use Unicode:
 		add_compile_definitions(UNICODE _UNICODE)
+
+		# Turn off CRT warnings:
+		add_compile_definitions(_CRT_SECURE_NO_WARNINGS)
+
+		return ()
 	endif()
 
 	# Allow for a forced 32-bit build under 64-bit OS:
@@ -99,7 +104,7 @@ function(set_global_flags)
 	# https://en.wikipedia.org/wiki/Uname
 	# https://gcc.gnu.org/onlinedocs/gcc/index.html
 	# Have the compiler generate code specifically targeted at the current machine on Linux:
-	if(UNIX AND NOT NO_NATIVE_OPTIMIZATION AND NOT CMAKE_CROSSCOMPILING)
+	if(NOT NO_NATIVE_OPTIMIZATION AND NOT CMAKE_CROSSCOMPILING)
 		string(TOLOWER ${CMAKE_SYSTEM_PROCESSOR} SYSTEM_PROCESSOR)
 		if (SYSTEM_PROCESSOR MATCHES "^(i386|i686|x86|amd64|mips)")
 			message(STATUS "Optimising for this machine (march=native)")
diff --git a/lib/SQLiteCpp b/lib/SQLiteCpp
index a25ffb56a..b1f67393f 160000
--- a/lib/SQLiteCpp
+++ b/lib/SQLiteCpp
@@ -1 +1 @@
-Subproject commit a25ffb56ab1bae0f416ac5dfbddd4188ea3c1a9c
+Subproject commit b1f67393fdac05d7d05b7f1232de688e82a7e98f
diff --git a/lib/lua b/lib/lua
index 935fe9113..f543fd793 160000
--- a/lib/lua
+++ b/lib/lua
@@ -1 +1 @@
-Subproject commit 935fe9113295e049baa8ab0163e2dfec0393a8dd
+Subproject commit f543fd79318bf31c81141a07662eb71896a1d938
diff --git a/lib/luaexpat b/lib/luaexpat
index 368e2927f..d1986776c 160000
--- a/lib/luaexpat
+++ b/lib/luaexpat
@@ -1 +1 @@
-Subproject commit 368e2927fcd227bf0af91b3e4b92e740196425cd
+Subproject commit d1986776c6c3d209a8410bd5928facf157dc42bd
diff --git a/lib/sqlite b/lib/sqlite
index 4435d7e42..9aeab26b0 160000
--- a/lib/sqlite
+++ b/lib/sqlite
@@ -1 +1 @@
-Subproject commit 4435d7e4297220228174385302d430f1fdf3d090
+Subproject commit 9aeab26b00c0bf4c1c3d0afd61acaf08eaf949d3
diff --git a/lib/tolua++ b/lib/tolua++
index 4d24aa316..26e85c404 160000
--- a/lib/tolua++
+++ b/lib/tolua++
@@ -1 +1 @@
-Subproject commit 4d24aa316898964c23896fbb7419bdaa23638c26
+Subproject commit 26e85c404baf1d2e5eb4a21660d1f37176d7ab33
diff --git a/src/Bindings/LuaState.cpp b/src/Bindings/LuaState.cpp
index 3a1379df1..e4c537967 100644
--- a/src/Bindings/LuaState.cpp
+++ b/src/Bindings/LuaState.cpp
@@ -6,10 +6,7 @@
 #include "Globals.h"
 #include "LuaState.h"
 
-extern "C"
-{
-	#include "lua/src/lualib.h"
-}
+#include "lua/src/lualib.h"
 
 #undef TOLUA_TEMPLATE_BIND
 #include "tolua++/include/tolua++.h"
@@ -34,17 +31,11 @@ extern "C"
 
 
 
-// fwd: "SQLite/lsqlite3.c"
-extern "C"
-{
-	int luaopen_lsqlite3(lua_State * L);
-}
+// fwd: "SQLite/lsqlite3.cpp"
+int luaopen_lsqlite3(lua_State * L);
 
-// fwd: "LuaExpat/lxplib.c":
-extern "C"
-{
-	int luaopen_lxp(lua_State * L);
-}
+// fwd: "LuaExpat/lxplib.cpp":
+int luaopen_lxp(lua_State * L);
 
 
 
diff --git a/src/Bindings/LuaState.h b/src/Bindings/LuaState.h
index 420fdad69..d579369f0 100644
--- a/src/Bindings/LuaState.h
+++ b/src/Bindings/LuaState.h
@@ -30,10 +30,7 @@ stays valid but doesn't call into Lua code anymore, returning false for "failure
 
 #pragma once
 
-extern "C"
-{
-	#include "lua/src/lauxlib.h"
-}
+#include "lua/src/lauxlib.h"
 
 #include "../Defines.h"
 #include "../FunctionRef.h"
diff --git a/src/Bindings/PluginLua.cpp b/src/Bindings/PluginLua.cpp
index 9b6bccf7c..887e6d699 100644
--- a/src/Bindings/PluginLua.cpp
+++ b/src/Bindings/PluginLua.cpp
@@ -18,10 +18,7 @@
 #include "../Root.h"
 #include "../WebAdmin.h"
 
-extern "C"
-{
-	#include "lua/src/lauxlib.h"
-}
+#include "lua/src/lauxlib.h"
 
 #undef TOLUA_TEMPLATE_BIND
 #include "tolua++/include/tolua++.h"
diff --git a/tests/Generating/CMakeLists.txt b/tests/Generating/CMakeLists.txt
index 92307235f..572f2b6d9 100644
--- a/tests/Generating/CMakeLists.txt
+++ b/tests/Generating/CMakeLists.txt
@@ -161,7 +161,7 @@ add_library(GeneratorTestingSupport STATIC
 	${GENERATING_HDRS}
 	${STUBS}
 )
-target_link_libraries(GeneratorTestingSupport fmt::fmt jsoncpp_static tolualib libdeflate)
+target_link_libraries(GeneratorTestingSupport fmt::fmt jsoncpp_static libdeflate lsqlite luaexpat tolualib)
 source_group("Stubs" FILES ${STUBS})
 source_group("Generating" FILES ${GENERATING_HDRS} ${GENERATING_SRCS})
 
diff --git a/tests/LoadablePieces/CMakeLists.txt b/tests/LoadablePieces/CMakeLists.txt
index c09cf8091..4133dea80 100644
--- a/tests/LoadablePieces/CMakeLists.txt
+++ b/tests/LoadablePieces/CMakeLists.txt
@@ -86,7 +86,7 @@ source_group("Shared" FILES ${SHARED_SRCS} ${SHARED_HDRS})
 source_group("Sources" FILES ${SRCS})
 source_group("Data files" FILES Test.cubeset Test1.schematic)
 add_executable(LoadablePieces ${SRCS} ${SHARED_SRCS} ${SHARED_HDRS} Test.cubeset Test1.schematic)
-target_link_libraries(LoadablePieces tolualib zlib)
+target_link_libraries(LoadablePieces libdeflate tolualib)
 add_test(NAME LoadablePieces-test WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} COMMAND LoadablePieces)
 
 
diff --git a/tests/LuaThreadStress/CMakeLists.txt b/tests/LuaThreadStress/CMakeLists.txt
index bd6b40f21..d4a929fdf 100644
--- a/tests/LuaThreadStress/CMakeLists.txt
+++ b/tests/LuaThreadStress/CMakeLists.txt
@@ -80,7 +80,7 @@ source_group("Shared" FILES ${SHARED_SRCS} ${SHARED_HDRS})
 source_group("Sources" FILES ${SRCS})
 source_group("Lua files" FILES Test.lua)
 add_executable(LuaThreadStress ${SRCS} ${SHARED_SRCS} ${SHARED_HDRS} Test.lua)
-target_link_libraries(LuaThreadStress fmt::fmt Threads::Threads tolualib libdeflate)
+target_link_libraries(LuaThreadStress fmt::fmt libdeflate lsqlite luaexpat Threads::Threads tolualib)
 add_test(NAME LuaThreadStress-test WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} COMMAND LuaThreadStress)