diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 000000000..0cffa367e
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,173 @@
+#
+# Simple CMakeLists for Sonic Robo Blast 2
+#
+PROJECT(SRB2)
+
+CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
+
+#
+# Dependencies
+#
+FIND_PACKAGE(SDL)
+FIND_PACKAGE(SDL_mixer)
+FIND_PACKAGE(PNG)
+
+#
+# Common stuff
+#
+
+# not added defines:
+# -DHAVE_PNG - does not build (incorrect use of PNG_EXPORT etc.)
+ADD_DEFINITIONS(-DDIRECTFULLSCREEN -DSDL -DHAVE_MIXER -DNOHW -DHW3SOUND -DHAVE_BLUA -DNOASM)
+
+SET(SDL_DIR sdl) # may be set to SDL2 optionally
+
+SET(COMMON_SRCS
+	src/${SDL_DIR}/dosstr.c
+	src/${SDL_DIR}/endtxt.c
+	src/${SDL_DIR}/hwsym_sdl.c
+	src/${SDL_DIR}/i_cdmus.c
+	src/${SDL_DIR}/i_main.c
+	src/${SDL_DIR}/i_net.c
+	src/${SDL_DIR}/i_system.c
+	src/${SDL_DIR}/i_video.c
+	src/${SDL_DIR}/mixer_sound.c
+	src/am_map.c
+	src/b_bot.c
+	src/blua/lapi.c
+	src/blua/lauxlib.c
+	src/blua/lbaselib.c
+	src/blua/lcode.c
+	src/blua/ldebug.c
+	src/blua/ldo.c
+	src/blua/ldump.c
+	src/blua/lfunc.c
+	src/blua/lgc.c
+	src/blua/linit.c
+	src/blua/llex.c
+	src/blua/lmem.c
+	src/blua/lobject.c
+	src/blua/lopcodes.c
+	src/blua/lparser.c
+	src/blua/lstate.c
+	src/blua/lstring.c
+	src/blua/lstrlib.c
+	src/blua/ltable.c
+	src/blua/ltablib.c
+	src/blua/ltm.c
+	src/blua/lundump.c
+	src/blua/lvm.c
+	src/blua/lzio.c
+	src/command.c
+	src/comptime.c
+	src/console.c
+	src/d_clisrv.c
+	src/d_main.c
+	src/d_net.c
+	src/d_netcmd.c
+	src/d_netfil.c
+	src/dehacked.c
+	src/f_finale.c
+	src/f_wipe.c
+	src/filesrch.c
+	src/g_game.c
+	src/g_input.c
+	src/hardware/hw3sound.c
+	src/hu_stuff.c
+	src/i_tcp.c
+	src/info.c
+	src/lua_baselib.c
+	src/lua_consolelib.c
+	src/lua_hooklib.c
+	src/lua_hudlib.c
+	src/lua_infolib.c
+	src/lua_maplib.c
+	src/lua_mathlib.c
+	src/lua_mobjlib.c
+	src/lua_playerlib.c
+	src/lua_script.c
+	src/lua_skinlib.c
+	src/lua_thinkerlib.c
+	src/lzf.c
+	src/m_anigif.c
+	src/m_argv.c
+	src/m_bbox.c
+	src/m_cheat.c
+	src/m_cond.c
+	src/m_fixed.c
+	src/m_menu.c
+	src/m_misc.c
+	src/m_queue.c
+	src/m_random.c
+	src/md5.c
+	src/mserv.c
+	src/p_ceilng.c
+	src/p_enemy.c
+	src/p_fab.c
+	src/p_floor.c
+	src/p_inter.c
+	src/p_lights.c
+	src/p_map.c
+	src/p_maputl.c
+	src/p_mobj.c
+	src/p_polyobj.c
+	src/p_saveg.c
+	src/p_setup.c
+	src/p_sight.c
+	src/p_spec.c
+	src/p_telept.c
+	src/p_tick.c
+	src/p_user.c
+	src/r_bsp.c
+	src/r_data.c
+	src/r_draw.c
+	src/r_main.c
+	src/r_plane.c
+	src/r_segs.c
+	src/r_sky.c
+	src/r_splats.c
+	src/r_things.c
+	src/s_sound.c
+	src/screen.c
+	src/sounds.c
+	src/st_stuff.c
+	src/string.c
+	src/tables.c
+	src/v_video.c
+	src/w_wad.c
+	src/y_inter.c
+	src/z_zone.c
+)
+
+#
+# Platform-specific stuff
+#
+
+MACRO(EXTRALIB NAME)
+	FIND_LIBRARY(${NAME}_LIBRARY NAMES ${NAME})
+	IF(${NAME}_LIBRARY)
+		MESSAGE(STATUS "Found lib${NAME}: ${${NAME}_LIBRARY}")
+		SET(EXTRA_LIBRARIES ${EXTRA_LIBRARIES} ${${NAME}_LIBRARY})
+	ELSE(${NAME}_LIBRARY)
+		MESSAGE(FATAL_ERROR "Could not find lib${NAME}!")
+	ENDIF(${NAME}_LIBRARY)
+ENDMACRO(EXTRALIB)
+
+IF(${CMAKE_SYSTEM} MATCHES "FreeBSD")
+	ADD_DEFINITIONS(-DUNIXCOMMON -DLINUX -DFREEBSD)
+	EXTRALIB(kvm)
+ELSEIF(${CMAKE_SYSTEM} MATCHES "Linux")
+	ADD_DEFINITIONS(-DUNIXCOMMON -DLINUX)
+	EXTRALIB(m)
+	EXTRALIB(rt)
+ELSE(${CMAKE_SYSTEM} MATCHES "FreeBSD")
+	ADD_DEFINITIONS(-DUNIXCOMMON -DLINUX)
+	MESSAGE(WARNING "No specific settings for you system, it may be not supported!")
+ENDIF(${CMAKE_SYSTEM} MATCHES "FreeBSD")
+
+#
+# Targets
+#
+INCLUDE_DIRECTORIES(${PNG_INCLUDE_DIRS} ${SDL_INCLUDE_DIR} ${SDL_MIXER_INCLUDE_DIRS})
+ADD_EXECUTABLE(SRB2 ${COMMON_SRCS})
+TARGET_LINK_LIBRARIES(SRB2 ${SDL_LIBRARY} ${SDL_MIXER_LIBRARIES} ${EXTRA_LIBRARIES})
diff --git a/src/endian.h b/src/endian.h
new file mode 100644
index 000000000..268c08023
--- /dev/null
+++ b/src/endian.h
@@ -0,0 +1,45 @@
+// SONIC ROBO BLAST 2
+//-----------------------------------------------------------------------------
+// Copyright (C) 2014 by Sonic Team Junior.
+//
+// This program is free software distributed under the
+// terms of the GNU General Public License, version 2.
+// See the 'LICENSE' file for more details.
+//-----------------------------------------------------------------------------
+/// \file  endian.h
+/// \brief Endian detection
+
+#ifndef __ENDIAN__
+#define __ENDIAN__
+
+#if defined(SRB2_BIG_ENDIAN) || defined(SRB2_LITTLE_ENDIAN)
+  // defined externally
+#else
+  #if defined(__FreeBSD__)
+    // on FreeBSD, _BIG_ENDIAN is a constant to compare
+	// _BYTE_ORDER to, not a big-endianess flag
+    #include <sys/endian.h>
+    #if _BYTE_ORDER == _BIG_ENDIAN
+      #define SRB2_BIG_ENDIAN
+    #else
+      #define SRB2_LITTLE_ENDIAN
+    #endif
+  #elif defined(__BYTE_ORDER__)
+    // defined by at least gcc and clang
+    #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+      #define SRB2_BIG_ENDIAN
+    #else
+      #define SRB2_LITTLE_ENDIAN
+    #endif
+  #else
+    // check used in vanilla SRB2 (may work incorrectly if
+	// _BIG_ENDIAN is used as on FreeBSD)
+    #if defined(_BIG_ENDIAN)
+      #define SRB2_BIG_ENDIAN
+    #else
+      #define SRB2_LITTLE_ENDIAN
+    #endif
+  #endif
+#endif
+
+#endif //__ENDIAN__
diff --git a/src/hardware/hw_main.c b/src/hardware/hw_main.c
index adaee1a1a..4f5acca86 100644
--- a/src/hardware/hw_main.c
+++ b/src/hardware/hw_main.c
@@ -2854,9 +2854,10 @@ static void HWR_Subsector(size_t num)
 #ifdef DOPLANES
 	// -------------------- WATER IN DEV. TEST ------------------------
 	//dck hack : use abs(tag) for waterheight
-	if (gr_frontsector->tag < 0)
+	//ilag : Since we changed to UINT16 for sector tags, simulate INT16
+	if (gr_frontsector->tag > 32767)
 	{
-		wh = ((-gr_frontsector->tag) <<FRACBITS) + (FRACUNIT/2);
+		wh = ((65535-gr_frontsector->tag) <<FRACBITS) + (FRACUNIT/2);
 		if (wh > gr_frontsector->floorheight &&
 			wh < gr_frontsector->ceilingheight)
 		{
diff --git a/src/m_swap.h b/src/m_swap.h
index ed723dff8..74e6d119e 100644
--- a/src/m_swap.h
+++ b/src/m_swap.h
@@ -14,9 +14,11 @@
 #ifndef __M_SWAP__
 #define __M_SWAP__
 
+#include "endian.h"
+
 // Endianess handling.
 // WAD files are stored little endian.
-#ifdef _BIG_ENDIAN
+#ifdef SRB2_BIG_ENDIAN
 
 #define SHORT(x) ((INT16)(\
 (((UINT16)(x) & (UINT16)0x00ffU) << 8) \
diff --git a/src/md5.c b/src/md5.c
index 73b767d65..aeaac2cde 100644
--- a/src/md5.c
+++ b/src/md5.c
@@ -44,14 +44,9 @@
 
 #include "md5.h"
 
-#ifdef _LIBC
- #include <endian.h>
- #if __BYTE_ORDER == __BIG_ENDIAN
-  #define WORDS_BIGENDIAN 1
- #endif
-#endif
+#include "endian.h"
 
-#if defined (WORDS_BIGENDIAN) || defined (_BIG_ENDIAN)
+#if defined (SRB2_BIG_ENDIAN)
  #define SWAP(n)							\
     (((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24))
 #else
diff --git a/src/p_mobj.c b/src/p_mobj.c
index 81ad1a5ee..29ba5d043 100644
--- a/src/p_mobj.c
+++ b/src/p_mobj.c
@@ -3670,7 +3670,7 @@ static void P_Boss3Thinker(mobj_t *mobj)
 // Move Boss4's sectors by delta.
 static boolean P_Boss4MoveCage(fixed_t delta)
 {
-	const INT16 tag = -2;
+	const UINT16 tag = 65534;
 	INT32 snum;
 	sector_t *sector;
 	for (snum = sectors[tag%numsectors].firsttag; snum != -1; snum = sector->nexttag)
@@ -3719,7 +3719,7 @@ static void P_Boss4PinchSpikeballs(mobj_t *mobj, angle_t angle, fixed_t fz)
 // Destroy cage FOFs.
 static void P_Boss4DestroyCage(void)
 {
-	const INT16 tag = -2;
+	const UINT16 tag = 65534;
 	INT32 snum, next;
 	size_t a;
 	sector_t *sector, *rsec;
diff --git a/src/r_defs.h b/src/r_defs.h
index dd096c3eb..f818ed65c 100644
--- a/src/r_defs.h
+++ b/src/r_defs.h
@@ -242,7 +242,7 @@ typedef struct sector_s
 	INT32 ceilingpic;
 	INT16 lightlevel;
 	INT16 special;
-	INT16 tag;
+	UINT16 tag;
 	INT32 nexttag, firsttag; // for fast tag searches
 
 	// origin for any sounds played by the sector
diff --git a/src/sdl/mixer_sound.c b/src/sdl/mixer_sound.c
index 6888331de..98159b473 100644
--- a/src/sdl/mixer_sound.c
+++ b/src/sdl/mixer_sound.c
@@ -152,7 +152,7 @@ static Mix_Chunk *ds2chunk(void *stream)
 		if (!(frac & 0xFFFF)) // other solid multiples (change if FRACBITS != 16)
 			newsamples = samples * (frac >> FRACBITS);
 		else // strange and unusual fractional frequency steps, plus anything higher than 44100hz.
-			newsamples = FixedMul(frac, samples) + 1; // add 1 sample for security! the code below rounds up.
+			newsamples = FixedMul(FixedDiv(samples, freq), 44100) + 1; // add 1 to counter truncation.
 		if (newsamples >= UINT32_MAX>>2)
 			return NULL; // would and/or did wrap, can't store.
 		break;