diff --git a/.circleci/config.yml b/.circleci/config.yml
index 8ecee2b19..67a3b66b7 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -43,7 +43,7 @@ jobs:
             - v1-SRB2-APT
       - run:
           name: Install SDK
-          command: apt-get -qq -y --no-install-recommends install git build-essential nasm libpng-dev:i386 libsdl2-mixer-dev:i386 libgme-dev:i386 libopenmpt-dev:i386 gettext ccache wget gcc-multilib upx openssh-client
+          command: apt-get -qq -y --no-install-recommends install git build-essential nasm libpng-dev:i386 libsdl2-mixer-dev:i386 libgme-dev:i386 libcurl4-openssl-dev:i386 libopenmpt-dev:i386 gettext ccache wget gcc-multilib upx openssh-client
 
       - save_cache:
           key: v1-SRB2-APT
@@ -71,4 +71,4 @@ jobs:
       - save_cache:
           key: v1-SRB2-{{ .Branch }}-{{ checksum "objs/Linux/SDL/Release/depend.dep" }}
           paths:
-            - /root/.ccache
\ No newline at end of file
+            - /root/.ccache
diff --git a/src/Makefile b/src/Makefile
index 0b7a8ea3a..27151cd3e 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -56,10 +56,10 @@
 #     Compile with GCC 4.6x version, add 'GCC46=1'
 #     Compile a profile version, add 'PROFILEMODE=1'
 #     Compile a debug version, add 'DEBUGMODE=1'
-#     Compile with extra warnings, add 'WARNINGMODE=1'
+#     Compile with less warnings, add 'RELAXWARNINGS=1'
+#     Generate compiler errors for most compiler warnings, add 'ERRORMODE=1'
 #     Compile without NASM's tmap.nas, add 'NOASM=1'
 #     Compile without 3D hardware support, add 'NOHW=1'
-#     Compile without 3D sound support, add 'NOHS=1'
 #     Compile with GDBstubs, add 'RDB=1'
 #     Compile without PNG, add 'NOPNG=1'
 #     Compile without zlib, add 'NOZLIB=1'
@@ -80,6 +80,58 @@
 #
 #############################################################################
 
+ALL_SYSTEMS=\
+	PANDORA\
+	LINUX64\
+	MINGW64\
+	HAIKU\
+	DUMMY\
+	DJGPPDOS\
+	MINGW\
+	UNIX\
+	LINUX\
+	SOLARIS\
+	FREEBSD\
+	MACOSX\
+	SDL\
+
+# check for user specified system
+ifeq (,$(filter $(ALL_SYSTEMS),$(.VARIABLES)))
+ifeq ($(OS),Windows_NT) # all windows are Windows_NT...
+
+ $(info Detected a Windows system, compiling for 32-bit MinGW SDL2...)
+
+ # go for a 32-bit sdl mingw exe by default
+ MINGW=1
+ SDL=1
+ WINDOWSHELL=1
+
+else # if you on the *nix
+
+ system:=$(shell uname -s)
+
+ ifeq ($(system),Linux)
+ new_system=LINUX
+ else
+
+ $(error \
+	 Could not automatically detect your system,\
+	 try specifying a system manually)
+
+ endif
+
+ ifeq ($(shell getconf LONG_BIT),64)
+ system+=64-bit
+ new_system:=$(new_system)64
+ endif
+
+ $(info Detected $(system) ($(new_system))...)
+ $(new_system)=1
+
+endif
+endif
+
+
 # SRB2 data files
 D_DIR?=../bin/Resources
 D_FILES=$(D_DIR)/srb2.pk3 \
@@ -119,7 +171,6 @@ NOPNG=1
 NOZLIB=1
 NONET=1
 NOHW=1
-NOHS=1
 NOASM=1
 NOIPX=1
 EXENAME?=srb2dummy
@@ -141,7 +192,6 @@ endif
 ifdef PANDORA
 NONX86=1
 NOHW=1
-NOHS=1
 endif
 
 ifndef NOOPENMPT
@@ -223,13 +273,6 @@ else
 		 $(OBJDIR)/hw_md2load.o $(OBJDIR)/hw_md3load.o $(OBJDIR)/hw_model.o $(OBJDIR)/u_list.o $(OBJDIR)/hw_batching.o
 endif
 
-ifdef NOHS
-	OPTS+=-DNOHS
-else
-	OPTS+=-DHW3SOUND
-	OBJS+=$(OBJDIR)/hw3sound.o
-endif
-
 OPTS += -DCOMPVERSION
 
 ifndef NONX86
@@ -750,19 +793,6 @@ $(OBJDIR)/ogl_win.o: hardware/r_opengl/ogl_win.c hardware/r_opengl/r_opengl.h \
 	$(CC) $(CFLAGS) $(WFLAGS) -D_WINDOWS -mwindows -c $< -o $@
 endif
 
-ifndef NOHS
-$(OBJDIR)/s_ds3d.o: hardware/s_ds3d/s_ds3d.c hardware/hw3dsdrv.h \
- hardware/hw_dll.h
-	$(CC) $(ARCHOPTS) -Os -o $(OBJDIR)/s_ds3d.o $(WFLAGS) -D_WINDOWS -mwindows -c hardware/s_ds3d/s_ds3d.c
-
-$(OBJDIR)/s_fmod.o: hardware/s_openal/s_openal.c hardware/hw3dsdrv.h \
- hardware/hw_dll.h
-	$(CC) $(ARCHOPTS) -Os -o $(OBJDIR)/s_fmod.o $(WFLAGS) -D_WINDOWS -mwindows -c hardware/s_fmod/s_fmod.c
-
-$(OBJDIR)/s_openal.o: hardware/s_openal/s_openal.c hardware/hw3dsdrv.h \
- hardware/hw_dll.h
-	$(CC) $(ARCHOPTS) -Os -o $(OBJDIR)/s_openal.o $(WFLAGS) -D_WINDOWS -mwindows -c hardware/s_openal/s_openal.c
-endif
 endif
 endif
 
diff --git a/src/Makefile.cfg b/src/Makefile.cfg
index 019b8c8d4..db7230bb4 100644
--- a/src/Makefile.cfg
+++ b/src/Makefile.cfg
@@ -48,7 +48,9 @@ endif
 
 # Automatically set version flag, but not if one was manually set
 ifeq   (,$(filter GCC%,$(.VARIABLES)))
- ifneq (,$(findstring gcc,$(shell $(CC) --version))) # if it's GCC
+ version:=$(shell $(CC) --version)
+ # check if this is in fact GCC
+ ifneq (,$(or $(findstring gcc,$(version)),$(findstring GCC,$(version))))
   version:=$(shell $(CC) -dumpversion)
 
   # Turn version into words of major, minor
@@ -208,10 +210,7 @@ WFLAGS=-Wall
 ifndef GCC295
 #WFLAGS+=-Wno-packed
 endif
-ifdef ERRORMODE
-WARNINGMODE=1
-endif
-ifdef WARNINGMODE
+ifndef RELAXWARNINGS
  WFLAGS+=-W
 #WFLAGS+=-Wno-sign-compare
 ifndef GCC295
diff --git a/src/d_clisrv.c b/src/d_clisrv.c
index 8c8dad4cc..9a636dd45 100644
--- a/src/d_clisrv.c
+++ b/src/d_clisrv.c
@@ -2306,7 +2306,7 @@ static void SL_InsertServer(serverinfo_pak* info, SINT8 node)
 	M_SortServerList();
 }
 
-#ifdef HAVE_THREADS
+#if defined (MASTERSERVER) && defined (HAVE_THREADS)
 struct Fetch_servers_ctx
 {
 	int room;
@@ -2351,7 +2351,7 @@ Fetch_servers_thread (struct Fetch_servers_ctx *ctx)
 
 	free(ctx);
 }
-#endif/*HAVE_THREADS*/
+#endif/*defined (MASTERSERVER) && defined (HAVE_THREADS)*/
 
 void CL_QueryServerList (msg_server_t *server_list)
 {
@@ -2388,9 +2388,8 @@ void CL_QueryServerList (msg_server_t *server_list)
 
 void CL_UpdateServerList(boolean internetsearch, INT32 room)
 {
-#ifdef HAVE_THREADS
-	struct Fetch_servers_ctx *ctx;
-#endif
+	(void)internetsearch;
+	(void)room;
 
 	SL_ClearServerList(0);
 
@@ -2407,9 +2406,12 @@ void CL_UpdateServerList(boolean internetsearch, INT32 room)
 	if (netgame)
 		SendAskInfo(BROADCASTADDR);
 
+#ifdef MASTERSERVER
 	if (internetsearch)
 	{
 #ifdef HAVE_THREADS
+		struct Fetch_servers_ctx *ctx;
+
 		ctx = malloc(sizeof *ctx);
 
 		/* This called from M_Refresh so I don't use a mutex */
@@ -2436,6 +2438,7 @@ void CL_UpdateServerList(boolean internetsearch, INT32 room)
 		}
 #endif
 	}
+#endif/*MASTERSERVER*/
 }
 
 #endif // ifndef NONET
@@ -2563,7 +2566,6 @@ static boolean CL_ServerConnectionSearchTicker(tic_t *asksent)
 		*asksent = I_GetTime();
 	}
 #else
-	(void)viams;
 	(void)asksent;
 	// No netgames, so we skip this state.
 	cl_mode = CL_ASKJOIN;
@@ -3840,8 +3842,10 @@ void D_QuitNetGame(void)
 		for (i = 0; i < MAXNETNODES; i++)
 			if (nodeingame[i])
 				HSendPacket(i, true, 0, 0);
+#ifdef MASTERSERVER
 		if (serverrunning && ms_RoomId > 0)
 			UnregisterServer();
+#endif
 	}
 	else if (servernode > 0 && servernode < MAXNETNODES && nodeingame[(UINT8)servernode])
 	{
@@ -4105,8 +4109,10 @@ boolean SV_SpawnServer(void)
 		if (netgame && I_NetOpenSocket)
 		{
 			I_NetOpenSocket();
+#ifdef MASTERSERVER
 			if (ms_RoomId > 0)
 				RegisterServer();
+#endif
 		}
 
 		// non dedicated server just connect to itself
@@ -5568,7 +5574,9 @@ void NetUpdate(void)
 	// client send the command after a receive of the server
 	// the server send before because in single player is beter
 
+#ifdef MASTERSERVER
 	MasterClient_Ticker(); // Acking the Master Server
+#endif
 
 	if (client)
 	{
diff --git a/src/d_main.c b/src/d_main.c
index 77c33e7ba..4a93c852d 100644
--- a/src/d_main.c
+++ b/src/d_main.c
@@ -648,6 +648,7 @@ static void D_Display(void)
 			V_DrawThinString(80, 40, V_MONOSPACE | V_BLUEMAP, s);
 			if (rendermode == render_opengl) // OpenGL specific stats
 			{
+#ifdef HWRENDER
 				snprintf(s, sizeof s - 1, "nsrt %d", rs_hw_nodesorttime / divisor);
 				V_DrawThinString(30, 40, V_MONOSPACE | V_YELLOWMAP, s);
 				snprintf(s, sizeof s - 1, "ndrw %d", rs_hw_nodedrawtime / divisor);
@@ -680,6 +681,7 @@ static void D_Display(void)
 					snprintf(s, sizeof s - 1, "ncol %d", rs_hw_numcolors);
 					V_DrawThinString(185, 30, V_MONOSPACE | V_PURPLEMAP, s);
 				}
+#endif
 			}
 			else // software specific stats
 			{
diff --git a/src/doomdef.h b/src/doomdef.h
index 31dd2bcda..24898bdf6 100644
--- a/src/doomdef.h
+++ b/src/doomdef.h
@@ -29,7 +29,6 @@
 // Use Mixer interface?
 #ifdef HAVE_MIXER
     #define SOUND SOUND_MIXER
-    #define NOHS // No HW3SOUND
     #ifdef HW3SOUND
     #undef HW3SOUND
     #endif
@@ -45,7 +44,6 @@
 // Use FMOD?
 #ifdef HAVE_FMOD
     #define SOUND SOUND_FMOD
-    #define NOHS // No HW3SOUND
     #ifdef HW3SOUND
     #undef HW3SOUND
     #endif
@@ -62,10 +60,6 @@
 #if !defined (HWRENDER) && !defined (NOHW)
 #define HWRENDER
 #endif
-// judgecutor: 3D sound support
-#if !defined(HW3SOUND) && !defined (NOHS)
-#define HW3SOUND
-#endif
 #endif
 
 #ifdef _WIN32
@@ -644,4 +638,10 @@ extern const char *compdate, *comptime, *comprevision, *compbranch;
 /// Maintain compatibility with older 2.2 demos
 #define OLD22DEMOCOMPAT
 
+#if defined (HAVE_CURL) && ! defined (NONET)
+#define MASTERSERVER
+#else
+#undef UPDATE_ALERT
+#endif
+
 #endif // __DOOMDEF__
diff --git a/src/http-mserv.c b/src/http-mserv.c
index 47c2b5b0f..1e8d35648 100644
--- a/src/http-mserv.c
+++ b/src/http-mserv.c
@@ -14,7 +14,9 @@ Documentation available here.
                      <http://mb.srb2.org/MS/tools/api/v1/>
 */
 
+#ifdef HAVE_CURL
 #include <curl/curl.h>
+#endif
 
 #include "doomdef.h"
 #include "d_clisrv.h"
@@ -49,6 +51,8 @@ consvar_t cv_masterserver_token = {
 	NULL, 0, NULL, NULL, 0, 0, NULL/* C90 moment */
 };
 
+#ifdef MASTERSERVER
+
 static int hms_started;
 
 static char *hms_api;
@@ -664,10 +668,14 @@ HMS_set_api (char *api)
 #endif
 }
 
+#endif/*MASTERSERVER*/
+
 static void
 MasterServer_Debug_OnChange (void)
 {
+#ifdef MASTERSERVER
 	/* TODO: change to 'latest-log.txt' for log files revision. */
 	if (cv_masterserver_debug.value)
 		CONS_Printf("Master server debug messages will appear in log.txt\n");
+#endif
 }
diff --git a/src/m_menu.c b/src/m_menu.c
index b80ace3cb..d09ce6087 100644
--- a/src/m_menu.c
+++ b/src/m_menu.c
@@ -3842,7 +3842,7 @@ void M_SetupNextMenu(menu_t *menudef)
 {
 	INT16 i;
 
-#ifdef HAVE_THREADS
+#if defined (MASTERSERVER) && defined (HAVE_THREADS)
 	if (currentMenu == &MP_RoomDef || currentMenu == &MP_ConnectDef)
 	{
 		I_lock_mutex(&ms_QueryId_mutex);
@@ -3930,7 +3930,7 @@ void M_Ticker(void)
 	if (currentMenu == &OP_ScreenshotOptionsDef)
 		M_SetupScreenshotMenu();
 
-#ifdef HAVE_THREADS
+#if defined (MASTERSERVER) && defined (HAVE_THREADS)
 	I_lock_mutex(&ms_ServerList_mutex);
 	{
 		if (ms_ServerList)
@@ -11194,8 +11194,9 @@ static boolean M_CheckMODVersion(int id)
 	} else
 		return true;
 }
+#endif/*UPDATE_ALERT*/
 
-#ifdef HAVE_THREADS
+#if defined (MASTERSERVER) && defined (HAVE_THREADS)
 static void
 Check_new_version_thread (int *id)
 {
@@ -11204,7 +11205,9 @@ Check_new_version_thread (int *id)
 
 	okay = 0;
 
+#ifdef UPDATE_ALERT
 	if (M_CheckMODVersion(*id))
+#endif
 	{
 		I_lock_mutex(&ms_QueryId_mutex);
 		{
@@ -11248,8 +11251,7 @@ Check_new_version_thread (int *id)
 
 	free(id);
 }
-#endif/*HAVE_THREADS*/
-#endif/*UPDATE_ALERT*/
+#endif/*defined (MASTERSERVER) && defined (HAVE_THREADS)*/
 
 static void M_ConnectMenu(INT32 choice)
 {
@@ -11290,7 +11292,7 @@ UINT32 roomIds[NUM_LIST_ROOMS];
 static void M_RoomMenu(INT32 choice)
 {
 	INT32 i;
-#ifdef HAVE_THREADS
+#if defined (MASTERSERVER) && defined (HAVE_THREADS)
 	int *id;
 #endif
 
@@ -11312,9 +11314,14 @@ static void M_RoomMenu(INT32 choice)
 	MP_RoomDef.prevMenu = currentMenu;
 	M_SetupNextMenu(&MP_RoomDef);
 
-#ifdef UPDATE_ALERT
+#ifdef MASTERSERVER
 #ifdef HAVE_THREADS
+#ifdef UPDATE_ALERT
 	m_waiting_mode = M_WAITING_VERSION;
+#else/*UPDATE_ALERT*/
+	m_waiting_mode = M_WAITING_ROOMS;
+#endif/*UPDATE_ALERT*/
+
 	MP_RoomMenu[0].text = "";
 
 	id = malloc(sizeof *id);
@@ -11328,17 +11335,19 @@ static void M_RoomMenu(INT32 choice)
 	I_spawn_thread("check-new-version",
 			(I_thread_fn)Check_new_version_thread, id);
 #else/*HAVE_THREADS*/
+#ifdef UPDATE_ALERT
 	if (M_CheckMODVersion(0))
+#endif/*UPDATE_ALERT*/
 	{
 		GetRoomsList(currentMenu->prevMenu == &MP_ServerDef, 0);
 	}
 #endif/*HAVE_THREADS*/
-#endif/*UPDATE_ALERT*/
+#endif/*MASTERSERVER*/
 }
 
 static void M_ChooseRoom(INT32 choice)
 {
-#ifdef HAVE_THREADS
+#if defined (MASTERSERVER) && defined (HAVE_THREADS)
 	I_lock_mutex(&ms_QueryId_mutex);
 	{
 		ms_QueryId++;
diff --git a/src/mserv.c b/src/mserv.c
index fcce1ab4d..27d479797 100644
--- a/src/mserv.c
+++ b/src/mserv.c
@@ -23,6 +23,8 @@
 #include "m_menu.h"
 #include "z_zone.h"
 
+#ifdef MASTERSERVER
+
 static int     MSId;
 static int     MSRegisteredId = -1;
 
@@ -43,17 +45,20 @@ static I_cond  MSCond;
 #  define Unlock_state()
 #endif/*HAVE_THREADS*/
 
-static void Update_parameters (void);
-
 #ifndef NONET
 static void Command_Listserv_f(void);
 #endif
+
+#endif/*MASTERSERVER*/
+
+static void Update_parameters (void);
+
 static void MasterServer_OnChange(void);
 
 static CV_PossibleValue_t masterserver_update_rate_cons_t[] = {
 	{2,  "MIN"},
 	{60, "MAX"},
-	{0}
+	{0,NULL}
 };
 
 consvar_t cv_masterserver = {"masterserver", "https://mb.srb2.org/MS/0", CV_SAVE|CV_CALL, NULL, MasterServer_OnChange, 0, NULL, NULL, 0, 0, NULL};
@@ -63,7 +68,7 @@ consvar_t cv_masterserver_update_rate = {"masterserver_update_rate", "15", CV_SA
 
 INT16 ms_RoomId = -1;
 
-#ifdef HAVE_THREADS
+#if defined (MASTERSERVER) && defined (HAVE_THREADS)
 int           ms_QueryId;
 I_mutex       ms_QueryId_mutex;
 
@@ -91,10 +96,14 @@ void AddMServCommands(void)
 	CV_RegisterVar(&cv_masterserver_debug);
 	CV_RegisterVar(&cv_masterserver_token);
 	CV_RegisterVar(&cv_servername);
+#ifdef MASTERSERVER
 	COM_AddCommand("listserv", Command_Listserv_f);
 #endif
+#endif
 }
 
+#ifdef MASTERSERVER
+
 static void WarnGUI (void)
 {
 #ifdef HAVE_THREADS
@@ -395,6 +404,7 @@ Change_masterserver_thread (char *api)
 
 void RegisterServer(void)
 {
+#ifdef MASTERSERVER
 #ifdef HAVE_THREADS
 	I_spawn_thread(
 			"register-server",
@@ -404,6 +414,7 @@ void RegisterServer(void)
 #else
 	Finish_registration();
 #endif
+#endif/*MASTERSERVER*/
 }
 
 static void UpdateServer(void)
@@ -421,6 +432,7 @@ static void UpdateServer(void)
 
 void UnregisterServer(void)
 {
+#ifdef MASTERSERVER
 #ifdef HAVE_THREADS
 	I_spawn_thread(
 			"unlist-server",
@@ -430,6 +442,7 @@ void UnregisterServer(void)
 #else
 	Finish_unlist();
 #endif
+#endif/*MASTERSERVER*/
 }
 
 static boolean
@@ -465,9 +478,33 @@ static inline void SendPingToMasterServer(void)
 	}
 }
 
+void MasterClient_Ticker(void)
+{
+#ifdef MASTERSERVER
+	SendPingToMasterServer();
+#endif
+}
+
+static void
+Set_api (const char *api)
+{
+#ifdef HAVE_THREADS
+	I_spawn_thread(
+			"change-masterserver",
+			(I_thread_fn)Change_masterserver_thread,
+			strdup(api)
+	);
+#else
+	HMS_set_api(strdup(api));
+#endif
+}
+
+#endif/*MASTERSERVER*/
+
 static void
 Update_parameters (void)
 {
+#ifdef MASTERSERVER
 	int registered;
 	int delayed;
 
@@ -487,29 +524,12 @@ Update_parameters (void)
 		if (! delayed && registered)
 			UpdateServer();
 	}
-}
-
-void MasterClient_Ticker(void)
-{
-	SendPingToMasterServer();
-}
-
-static void
-Set_api (const char *api)
-{
-#ifdef HAVE_THREADS
-	I_spawn_thread(
-			"change-masterserver",
-			(I_thread_fn)Change_masterserver_thread,
-			strdup(api)
-	);
-#else
-	HMS_set_api(strdup(api));
-#endif
+#endif/*MASTERSERVER*/
 }
 
 static void MasterServer_OnChange(void)
 {
+#ifdef MASTERSERVER
 	UnregisterServer();
 
 	/*
@@ -527,4 +547,5 @@ static void MasterServer_OnChange(void)
 
 	if (Online())
 		RegisterServer();
+#endif/*MASTERSERVER*/
 }
diff --git a/src/sdl/Makefile.cfg b/src/sdl/Makefile.cfg
index 68e616f01..45d0d6ba7 100644
--- a/src/sdl/Makefile.cfg
+++ b/src/sdl/Makefile.cfg
@@ -53,28 +53,6 @@ ifndef NOHW
 	OBJS+=$(OBJDIR)/r_opengl.o $(OBJDIR)/ogl_sdl.o
 endif
 
-ifndef NOHS
-ifdef OPENAL
-	OBJS+=$(OBJDIR)/s_openal.o
-	OPTS+=-DSTATIC3DS
-	STATICHS=1
-else
-ifdef FMOD
-	OBJS+=$(OBJDIR)/s_fmod.o
-	OPTS+=-DSTATIC3DS
-	STATICHS=1
-else
-ifdef MINGW
-ifdef DS3D
-	OBJS+=$(OBJDIR)/s_ds3d.o
-	OPTS+=-DSTATIC3DS
-	STATICHS=1
-endif
-endif
-endif
-endif
-endif
-
 ifdef NOMIXER
 	i_sound_o=$(OBJDIR)/sdl_sound.o
 else
diff --git a/src/sdl/i_video.c b/src/sdl/i_video.c
index 01194a02f..5c5b6119c 100644
--- a/src/sdl/i_video.c
+++ b/src/sdl/i_video.c
@@ -1478,6 +1478,7 @@ static SDL_bool Impl_CreateContext(void)
 
 void VID_CheckGLLoaded(rendermode_t oldrender)
 {
+	(void)oldrender;
 #ifdef HWRENDER
 	if (vid_opengl_state == -1) // Well, it didn't work the first time anyway.
 	{
diff --git a/src/sdl/mixer_sound.c b/src/sdl/mixer_sound.c
index ef34b266d..25e7fde89 100644
--- a/src/sdl/mixer_sound.c
+++ b/src/sdl/mixer_sound.c
@@ -220,6 +220,7 @@ static void var_cleanup(void)
 	internal_volume = 100;
 }
 
+#if defined (HAVE_LIBGME) && defined (HAVE_ZLIB)
 static const char* get_zlib_error(int zErr)
 {
 	switch (zErr)
@@ -240,6 +241,7 @@ static const char* get_zlib_error(int zErr)
 			return "unknown error";
 	}
 }
+#endif
 
 /// ------------------------
 /// Audio System