diff --git a/CMakeLists.txt b/CMakeLists.txt
index fa01e3a5..5910934a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.1)
+cmake_minimum_required(VERSION 3.4)
 if(POLICY CMP0025)
 	cmake_policy(SET CMP0025 NEW)
 endif()
@@ -241,8 +241,8 @@ elseif(UNIX)
 		add_definitions(-D_GNU_SOURCE)
 	endif()
 	if(NOT APPLE AND NOT HAIKU)
-		set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -pthread")
-		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread")
+		set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -lpthread")
+		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -lpthread")
 	endif()
 
 	list(APPEND CORE_VFS_SRC ${CMAKE_CURRENT_SOURCE_DIR}/src/util/vfs/vfs-fd.c ${CMAKE_CURRENT_SOURCE_DIR}/src/util/vfs/vfs-dirent.c)
diff --git a/include/mgba-util/platform/posix/threading.h b/include/mgba-util/platform/posix/threading.h
index 468e1460..50cba731 100644
--- a/include/mgba-util/platform/posix/threading.h
+++ b/include/mgba-util/platform/posix/threading.h
@@ -85,25 +85,8 @@ static inline int ThreadJoin(Thread thread) {
 }
 
 static inline int ThreadSetName(const char* name) {
-#ifdef __APPLE__
-#if __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 1060
-	return pthread_setname_np(name);
-#else
 	UNUSED(name);
 	return 0;
-#endif
-#elif defined(__FreeBSD__) || defined(__OpenBSD__)
-	pthread_set_name_np(pthread_self(), name);
-	return 0;
-#elif defined(__HAIKU__)
-	rename_thread(find_thread(NULL), name);
-	return 0;
-#elif !defined(BUILD_PANDORA) // Pandora's glibc is too old
-	return pthread_setname_np(pthread_self(), name);
-#else
-	UNUSED(name);
-	return 0;
-#endif
 }
 
 CXX_GUARD_END
diff --git a/include/mgba/core/interface.h b/include/mgba/core/interface.h
index e5c9dde1..82d3b828 100644
--- a/include/mgba/core/interface.h
+++ b/include/mgba/core/interface.h
@@ -31,7 +31,7 @@ typedef uint32_t color_t;
 #define M_G8(X) (((((X) >> 2) & 0xF8) * 0x21) >> 5)
 #define M_B8(X) (((((X) >> 7) & 0xF8) * 0x21) >> 5)
 
-#define M_RGB5_TO_BGR8(X) ((M_R5(X) << 3) | (M_G5(X) << 11) | (M_B5(X) << 19))
+#define M_RGB5_TO_BGR8(X) ((M_B5(X) << 3) | (M_G5(X) << 11) | (M_R5(X) << 19))
 #define M_RGB8_TO_BGR5(X) ((((X) & 0xF8) >> 3) | (((X) & 0xF800) >> 6) | (((X) & 0xF80000) >> 9))
 #define M_RGB8_TO_RGB5(X) ((((X) & 0xF8) << 7) | (((X) & 0xF800) >> 6) | (((X) & 0xF80000) >> 19))
 
diff --git a/src/platform/sdl/sdl-audio.c b/src/platform/sdl/sdl-audio.c
index ab0bd830..7cd77495 100644
--- a/src/platform/sdl/sdl-audio.c
+++ b/src/platform/sdl/sdl-audio.c
@@ -24,6 +24,15 @@ bool mSDLInitAudio(struct mSDLAudio* context, struct mCoreThread* threadContext)
 		return false;
 	}
 
+	// Workaround: The thread of _mSDLAudioCallback cannot see these changes
+	// unless they are made before the SDL_OpenAudio call.
+	// This makes the `if (!context || !audioContext->core) {` check in
+	// _mSDLAudioCallback not bail out. This is rather important, the whole
+	// emulation seems to be synched to the audio.
+	context->core = threadContext->core;
+	context->sync = &threadContext->impl->sync;
+	// --
+
 	context->desiredSpec.freq = context->sampleRate;
 	context->desiredSpec.format = AUDIO_S16SYS;
 	context->desiredSpec.channels = 2;
diff --git a/src/third-party/zlib/contrib/minizip/ioapi.c b/src/third-party/zlib/contrib/minizip/ioapi.c
index 7f5c191b..744dd96b 100644
--- a/src/third-party/zlib/contrib/minizip/ioapi.c
+++ b/src/third-party/zlib/contrib/minizip/ioapi.c
@@ -14,7 +14,7 @@
         #define _CRT_SECURE_NO_WARNINGS
 #endif
 
-#if defined(__APPLE__) || defined(IOAPI_NO_64)
+#if defined(__APPLE__) || defined(IOAPI_NO_64) || defined(__redox__)
 // In darwin and perhaps other BSD variants off_t is a 64 bit value, hence no need for specific 64 bit functions
 #define FOPEN_FUNC(filename, mode) fopen(filename, mode)
 #define FTELLO_FUNC(stream) ftello(stream)
diff --git a/src/util/vfs/vfs-fd.c b/src/util/vfs/vfs-fd.c
index 4a20eaf7..3307709c 100644
--- a/src/util/vfs/vfs-fd.c
+++ b/src/util/vfs/vfs-fd.c
@@ -42,7 +42,8 @@ struct VFile* VFileOpenFD(const char* path, int flags) {
 	MultiByteToWideChar(CP_UTF8, 0, path, -1, wpath, sizeof(wpath) / sizeof(*wpath));
 	int fd = _wopen(wpath, flags, 0666);
 #else
-	int fd = open(path, flags, 0666);
+	// Workaround for the _vfdMap permission problems below
+	int fd = open(path, flags | O_RDWR, 0666);
 #endif
 	return VFileFromFD(fd);
 }
@@ -164,24 +165,6 @@ static ssize_t _vfdSize(struct VFile* vf) {
 static bool _vfdSync(struct VFile* vf, const void* buffer, size_t size) {
 	UNUSED(buffer);
 	UNUSED(size);
-	struct VFileFD* vfd = (struct VFileFD*) vf;
-#ifndef _WIN32
-#ifdef __HAIKU__
-	futimens(vfd->fd, NULL);
-#else
-	futimes(vfd->fd, NULL);
-#endif
-	if (buffer && size) {
-		return msync(buffer, size, MS_SYNC) == 0;
-	}
-	return fsync(vfd->fd) == 0;
-#else
-	HANDLE h = (HANDLE) _get_osfhandle(vfd->fd);
-	FILETIME ft;
-	SYSTEMTIME st;
-	GetSystemTime(&st);
-	SystemTimeToFileTime(&st, &ft);
-	SetFileTime(h, NULL, &ft, &ft);
-	return FlushFileBuffers(h);
-#endif
+	printf("_vfdSync\n");
+	return true;
 }