diff --git a/linux.cmake b/linux.cmake
new file mode 100644
index 0000000000..77a58dfa83
--- /dev/null
+++ b/linux.cmake
@@ -0,0 +1,10 @@
+# These are various overrides for dependencies built using CMake.
+
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_C_COMPILER gcc)
+set(CMAKE_C_FLAGS -m32)
+set(CMAKE_CXX_COMPILER g++)
+set(CMAKE_CXX_FLAGS -m32)
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
diff --git a/linux.mk b/linux.mk
new file mode 100644
index 0000000000..3da07dc844
--- /dev/null
+++ b/linux.mk
@@ -0,0 +1,340 @@
+include version.mk
+
+BUILD_NUMBER ?= $(VER_BUILD)
+VER_STRING := $(VER_MAJOR).$(VER_MINOR).$(VER_RELEASE).$(BUILD_NUMBER) $(PACKAGE_SUFFIX)
+
+ROOTDIR := $(dir $(abspath $(lastword $(MAKEFILE_LIST))))
+
+RM       = rm -f
+MV       = mv -f
+CP       = cp -f
+MKDIR    = mkdir -p
+ECHO     = echo
+CD       = cd
+CMAKE    := cmake -DCMAKE_TOOLCHAIN_FILE=$(ROOTDIR)/linux.cmake
+
+SOURCES = \
+	src/actionpt.c \
+	src/api.c \
+	src/ariadne.c \
+	src/ariadne_edge.c \
+	src/ariadne_findcache.c \
+	src/ariadne_naviheap.c \
+	src/ariadne_navitree.c \
+	src/ariadne_points.c \
+	src/ariadne_regions.c \
+	src/ariadne_tringls.c \
+	src/ariadne_wallhug.c \
+	src/bflib_base_tcp.c \
+	src/bflib_basics.c \
+	src/bflib_bufrw.c \
+	src/bflib_coroutine.c \
+	src/bflib_client_tcp.c \
+	src/bflib_cpu.c \
+	src/bflib_datetm.c \
+	src/bflib_dernc.c \
+	src/bflib_enet.c \
+	src/bflib_fileio.c \
+	src/bflib_filelst.c \
+	src/bflib_guibtns.c \
+	src/bflib_inputctrl.c \
+	src/bflib_keybrd.c \
+	src/bflib_main.c \
+	src/bflib_math.c \
+	src/bflib_memory.c \
+	src/bflib_mouse.c \
+	src/bflib_mshandler.c \
+	src/bflib_mspointer.c \
+	src/bflib_netsession.c \
+	src/bflib_netsp.c \
+	src/bflib_netsp_ipx.c \
+	src/bflib_netsync.c \
+	src/bflib_network.c \
+	src/bflib_planar.c \
+	src/bflib_render.c \
+	src/bflib_render_gpoly.c \
+	src/bflib_render_trig.c \
+	src/bflib_server_tcp.c \
+	src/bflib_sound.c \
+	src/bflib_sprfnt.c \
+	src/bflib_sprite.c \
+	src/bflib_string.c \
+	src/bflib_tcpsp.c \
+	src/bflib_threadcond.c \
+	src/bflib_video.c \
+	src/bflib_vidraw.c \
+	src/bflib_vidraw_spr_norm.c \
+	src/bflib_vidraw_spr_onec.c \
+	src/bflib_vidraw_spr_remp.c \
+	src/bflib_vidsurface.c \
+	src/config.c \
+	src/config_campaigns.c \
+	src/config_creature.c \
+	src/config_crtrmodel.c \
+	src/config_crtrstates.c \
+	src/config_lenses.c \
+	src/config_magic.c \
+	src/config_objects.c \
+	src/config_players.c \
+	src/config_powerhands.c \
+	src/config_rules.c \
+	src/config_settings.c \
+	src/config_slabsets.c \
+	src/config_strings.c \
+	src/config_terrain.c \
+	src/config_cubes.c \
+	src/config_textures.c \
+	src/config_trapdoor.c \
+	src/config_spritecolors.c \
+	src/console_cmd.c \
+	src/custom_sprites.c \
+	src/creature_battle.c \
+	src/creature_control.c \
+	src/creature_graphics.c \
+	src/creature_groups.c \
+	src/creature_instances.c \
+	src/creature_jobs.c \
+	src/creature_senses.c \
+	src/creature_states.c \
+	src/creature_states_barck.c \
+	src/creature_states_combt.c \
+	src/creature_states_gardn.c \
+	src/creature_states_guard.c \
+	src/creature_states_hero.c \
+	src/creature_states_lair.c \
+	src/creature_states_mood.c \
+	src/creature_states_pray.c \
+	src/creature_states_prisn.c \
+	src/creature_states_rsrch.c \
+	src/creature_states_scavn.c \
+	src/creature_states_spdig.c \
+	src/creature_states_tortr.c \
+	src/creature_states_train.c \
+	src/creature_states_tresr.c \
+	src/creature_states_wrshp.c \
+	src/cursor_tag.c \
+	src/dungeon_data.c \
+	src/dungeon_stats.c \
+	src/engine_arrays.c \
+	src/engine_camera.c \
+	src/engine_lenses.c \
+	src/engine_redraw.c \
+	src/engine_render.c \
+	src/engine_render_data.c \
+	src/engine_textures.c \
+	src/front_credits.c \
+	src/front_credits_data.c \
+	src/front_easter.c \
+	src/front_fmvids.c \
+	src/front_highscore.c \
+	src/front_input.c \
+	src/front_landview.c \
+	src/front_lvlstats.c \
+	src/front_lvlstats_data.c \
+	src/front_network.c \
+	src/front_simple.c \
+	src/front_torture.c \
+	src/front_torture_data.c \
+	src/frontend.c \
+	src/frontmenu_options_data.c \
+	src/frontmenu_saves_data.c \
+	src/frontmenu_select.c \
+	src/frontmenu_select_data.c \
+	src/frontmenu_ingame_evnt.c \
+	src/frontmenu_ingame_evnt_data.c \
+	src/frontmenu_ingame_map.c \
+	src/frontmenu_ingame_opts.c \
+	src/frontmenu_ingame_opts_data.c \
+	src/frontmenu_ingame_tabs.c \
+	src/frontmenu_ingame_tabs_data.c \
+	src/frontmenu_net.c \
+	src/frontmenu_net_data.c \
+	src/frontmenu_options.c \
+	src/frontmenu_saves.c \
+	src/frontmenu_specials.c \
+	src/game_heap.c \
+	src/game_legacy.c \
+	src/game_loop.c \
+	src/game_lghtshdw.c \
+	src/game_merge.c \
+	src/game_saves.c \
+	src/gui_boxmenu.c \
+	src/gui_draw.c \
+	src/gui_frontbtns.c \
+	src/gui_frontmenu.c \
+	src/gui_msgs.c \
+	src/gui_parchment.c \
+	src/gui_soundmsgs.c \
+	src/gui_tooltips.c \
+	src/gui_topmsg.c \
+	src/kjm_input.c \
+	src/lens_api.c \
+	src/config_effects.c \
+	src/lens_flyeye.c \
+	src/lens_mist.c \
+	src/light_data.c \
+	src/lvl_filesdk1.c \
+	src/lvl_script.c \
+	src/lvl_script_commands.c \
+	src/lvl_script_commands_old.c \
+	src/lvl_script_lib.c \
+	src/lvl_script_conditions.c \
+	src/lvl_script_value.c \
+	src/magic.c \
+	src/main.cpp \
+	src/main_game.c \
+	src/map_blocks.c \
+	src/map_columns.c \
+	src/map_ceiling.c \
+	src/map_data.c \
+	src/map_events.c \
+	src/map_locations.c \
+	src/map_utils.c \
+	src/moonphase.c \
+	src/music_player.c \
+	src/net_game.c \
+	src/net_sync.c \
+	src/packets.c \
+	src/packets_cheats.c \
+	src/packets_input.c \
+	src/packets_misc.c \
+	src/player_compchecks.c \
+	src/player_compevents.c \
+	src/player_complookup.c \
+	src/config_compp.c \
+	src/player_compprocs.c \
+	src/player_comptask.c \
+	src/player_computer.c \
+	src/player_computer_data.c \
+	src/player_data.c \
+	src/player_instances.c \
+	src/player_utils.c \
+	src/power_hand.c \
+	src/power_process.c \
+	src/power_specials.c \
+	src/room_data.c \
+	src/room_entrance.c \
+	src/room_garden.c \
+	src/room_graveyard.c \
+	src/room_jobs.c \
+	src/room_lair.c \
+	src/room_library.c \
+	src/room_list.c \
+	src/room_scavenge.c \
+	src/room_util.c \
+	src/room_workshop.c \
+	src/roomspace.c \
+	src/roomspace_detection.c \
+	src/scrcapt.c \
+	src/slab_data.c \
+	src/sounds.c \
+	src/spdigger_stack.c \
+	src/tasks_list.c \
+	src/thing_corpses.c \
+	src/thing_creature.c \
+	src/thing_creature_data.c \
+	src/thing_data.c \
+	src/thing_doors.c \
+	src/thing_effects.c \
+	src/thing_factory.c \
+	src/thing_list.c \
+	src/thing_navigate.c \
+	src/thing_objects.c \
+	src/thing_physics.c \
+	src/thing_shots.c \
+	src/thing_stats.c \
+	src/thing_traps.c \
+	src/value_util.c \
+	src/vidfade.c \
+	src/vidmode_data.c \
+	src/vidmode.c \
+	src/KeeperSpeechImp.c \
+	src/stubs.cpp \
+	src/linux.cpp
+
+WIN_SOURCES = \
+	src/bflib_crash.c \
+	src/bflib_fmvids.c \
+	src/bflib_sndlib.c \
+	src/steam_api.c
+
+INCLUDES = \
+	deps/centitoml \
+	deps/centijson/src \
+	deps/libspng/spng \
+	deps/enet/include
+
+DEPS = \
+	deps/astronomy/astronomy.o \
+	deps/centijson/build/libjson.a \
+	deps/centitoml/toml_api.o \
+	deps/libspng/build/libspng_static.a \
+	deps/zlib/contrib/minizip/unzip.o \
+	deps/zlib/contrib/minizip/ioapi.o \
+	deps/enet/build/libenet.a
+
+CFLAGS = -c -g -m32 --std=gnu17 -Wall -Wextra -Werror -Wno-sign-compare -Wno-unused-parameter -Wno-unknown-pragmas -Wno-format-truncation
+CXXFLAGS = -c -g -m32 --std=c++23 -Wall -Wextra -Werror -Wno-sign-compare -Wno-unused-parameter -Wno-unknown-pragmas -Wno-format-truncation
+
+all: bin/keeperfx
+
+clean:
+	$(RM) -r obj src/ver_defs.h
+
+bin/keeperfx: obj/archive.a $(DEPS) | bin
+	$(CXX) -g -m32 -o $@ $^ -lSDL2 -lSDL2_mixer -lSDL2_net -lSDL2_image -lz -lm
+
+obj/%.o: src/%.c | obj src/ver_defs.h
+	$(CC) $(CFLAGS) -o $@ $(addprefix -I,$(INCLUDES)) $^
+
+obj/%.o: src/%.cpp | obj src/ver_defs.h
+	$(CXX) $(CXXFLAGS) -o $@ $(addprefix -I,$(INCLUDES)) $^
+
+obj/archive.a: $(patsubst src/%.c,obj/%.o,$(patsubst src/%.cpp,obj/%.o,$(SOURCES))) | obj
+	$(AR) r $@ $^
+
+bin obj:
+	$(MKDIR) -p $@
+
+src/ver_defs.h: version.mk
+	$(ECHO) \#define VER_MAJOR   $(VER_MAJOR) > "$@.swp"
+	$(ECHO) \#define VER_MINOR   $(VER_MINOR) >> "$@.swp"
+	$(ECHO) \#define VER_RELEASE $(VER_RELEASE) >> "$@.swp"
+	$(ECHO) \#define VER_BUILD   $(BUILD_NUMBER) >> "$@.swp"
+	$(ECHO) \#define VER_STRING  \"$(VER_STRING)\" >> "$@.swp"
+	$(ECHO) \#define PACKAGE_SUFFIX  \"$(PACKAGE_SUFFIX)\" >> "$@.swp"
+	$(ECHO) \#define GIT_REVISION  \"`git describe  --always`\" >> "$@.swp"
+	$(MV) "$@.swp" "$@"
+
+deps/astronomy/astronomy.o: deps/astronomy/astronomy.c
+	$(CC) $(CFLAGS) -o $@ $^
+
+deps/centijson/build/libjson.a: deps/centijson/build/Makefile
+	$(CD) deps/centijson/build && $(MAKE)
+
+deps/centijson/build/Makefile:
+	$(MKDIR) -p deps/centijson/build
+	$(CD) deps/centijson/build && $(CMAKE) ..
+
+deps/centitoml/toml_api.o: deps/centitoml/toml_api.c
+	$(CC) $(CFLAGS) -o $@ $^ -Ideps/centijson/src
+
+deps/zlib/contrib/minizip/unzip.o: deps/zlib/contrib/minizip/unzip.c
+	$(CC) $(CFLAGS) -o $@ $^
+
+deps/zlib/contrib/minizip/ioapi.o: deps/zlib/contrib/minizip/ioapi.c
+	$(CC) $(CFLAGS) -o $@ $^
+
+deps/libspng/build/libspng_static.a: deps/libspng/build/Makefile
+	$(CD) deps/libspng/build && $(MAKE)
+
+deps/libspng/build/Makefile:
+	$(MKDIR) -p deps/libspng/build
+	$(CD) deps/libspng/build && $(CMAKE) ..
+
+deps/enet/build/libenet.a: deps/enet/build/Makefile
+	$(CD) deps/enet/build && $(MAKE)
+
+deps/enet/build/Makefile:
+	$(MKDIR) -p deps/enet/build
+	$(CD) deps/enet/build && $(CMAKE) ..
diff --git a/src/bflib_fileio.c b/src/bflib_fileio.c
index 7af1396fb3..d3ebfd5cb9 100644
--- a/src/bflib_fileio.c
+++ b/src/bflib_fileio.c
@@ -26,20 +26,14 @@
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <io.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <limits.h>
 #include <time.h>
-#include <share.h>
 
 #include "bflib_basics.h"
 #include "bflib_datetm.h"
 
-#if defined(_WIN32)||defined(DOS)||defined(GO32)
-#include <dos.h>
-#include <direct.h>
-#endif
 #include "post_inc.h"
 
 short LbFileExists(const char *fname)
@@ -62,7 +56,11 @@ int create_directory_for_file(const char * fname)
   while (separator != NULL) {
     memcpy(tmp, fname, separator - fname);
     tmp[separator - fname] = 0;
+#if defined(_WIN32)
     if (mkdir(tmp) != 0) {
+#else
+    if (mkdir(tmp, 0755) != 0) {
+#endif
       if (errno != EEXIST) {
         free(tmp);
         return 0;
diff --git a/src/linux.cpp b/src/linux.cpp
new file mode 100644
index 0000000000..db6c84901f
--- /dev/null
+++ b/src/linux.cpp
@@ -0,0 +1,132 @@
+
+#include "bflib_fileio.h"
+#include "bflib_cpu.h"
+#include "bflib_crash.h"
+#include "bflib_datetm.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <fnmatch.h>
+#include <string>
+#include <cstring>
+#include <memory>
+#include <ctime>
+
+struct TbFileFind {
+	std::string filespec;
+	std::string path;
+	std::string namebuf;
+	DIR * handle = nullptr;
+	bool is_pattern = false;
+};
+
+bool filespec_is_pattern(const char * filespec) {
+	return strchr(filespec, '*') != nullptr;
+}
+
+std::string directory_from_filespec(const char * filespec) {
+	const auto sep = strrchr(filespec, '/');
+	if (sep && sep != filespec) {
+		return std::string(filespec, sep - filespec);
+	} else {
+		return ".";
+	}
+}
+
+bool find_file(TbFileFind * ff, TbFileEntry * fe) {
+	while (true) {
+		auto de = readdir(ff->handle);
+		if (!de) {
+			return false;
+		} else if (strcmp(de->d_name, ".") == 0) {
+			continue;
+		} else if (strcmp(de->d_name, "..") == 0) {
+			continue;
+		}
+		const std::string path = ff->path + "/" + de->d_name;
+		ff->namebuf = de->d_name;
+		fe->Filename = ff->namebuf.c_str();
+		if (ff->is_pattern) {
+			if (fnmatch(ff->filespec.c_str(), path.c_str(), FNM_FILE_NAME | FNM_CASEFOLD) != 0) {
+				continue;
+			}
+		}
+		struct stat sb;
+		if (stat(path.c_str(), &sb) < 0) {
+			continue;
+		} else if (!S_ISREG(sb.st_mode)) {
+			continue;
+		}
+		return true;
+	}
+	return false;
+}
+
+extern "C" TbFileFind * LbFileFindFirst(const char * filespec, TbFileEntry * fe)
+{
+	try {
+		auto ff = std::make_unique<TbFileFind>();
+		ff->is_pattern = filespec_is_pattern(filespec);
+		ff->filespec = filespec;
+		if (ff->is_pattern) {
+			ff->path = directory_from_filespec(filespec);
+			ff->handle = opendir(ff->path.c_str());
+		} else {
+			ff->path = filespec;
+			ff->handle = opendir(filespec);
+		}
+		if (ff->handle) {
+			if (find_file(ff.get(), fe)) {
+				return ff.release();
+			}
+		}
+	} catch (...) {}
+	return nullptr;
+}
+
+extern "C" int LbFileFindNext(TbFileFind * ff, TbFileEntry * fe)
+{
+	try {
+		if (find_file(ff, fe)) {
+			return 1;
+		}
+	} catch (...) {}
+	return -1;
+}
+
+extern "C" void LbFileFindEnd(TbFileFind * ff)
+{
+	if (ff) {
+		closedir(ff->handle);
+	}
+	delete ff;
+}
+
+extern "C" void log_system_info(const CPU_INFO *) {
+	// TODO
+}
+
+extern "C" void get_cmdln_args(unsigned short &argc, char *argv[]) {
+	// Nothing to do here
+}
+
+extern "C" void platform_init() {
+	// Nothing to do here
+}
+
+extern "C" void LbErrorParachuteInstall() {
+	// Nothing to do here
+}
+
+extern "C" void LbErrorParachuteUpdate() {
+	// Nothing to do here
+}
+
+extern "C" void LbDoMultitasking()
+{
+	timespec ts;
+	ts.tv_sec = 0;
+	ts.tv_nsec = (LARGE_DELAY_TIME>>1) * 1000;
+	nanosleep(&ts, nullptr);
+}
diff --git a/src/stubs.cpp b/src/stubs.cpp
new file mode 100644
index 0000000000..232671cb6c
--- /dev/null
+++ b/src/stubs.cpp
@@ -0,0 +1,40 @@
+#include "bflib_sound.h"
+
+extern "C" int init_miles_sound_system() { return 0; }
+extern "C" void unload_miles_sound_system() {}
+extern "C" int FreeAudio() { return 0; }
+extern "C" int SetRedbookVolume(int) { return 0; }
+extern "C" int SetSoundMasterVolume(int) { return 0; }
+extern "C" int SetMusicMasterVolume(int) { return 0; }
+extern "C" int GetSoundInstalled(void) { return 0; }
+extern "C" int PlayRedbookTrack(int) { return 0; }
+extern "C" int PauseRedbookTrack(void) { return 0; }
+extern "C" int ResumeRedbookTrack(void) { return 0; }
+extern "C" int MonitorStreamedSoundTrack(void) { return 0; }
+extern "C" int StopRedbookTrack(void) { return 0; }
+extern "C" void * GetSoundDriver(void) { return nullptr; }
+extern "C" int StopAllSamples(void) { return 0; }
+extern "C" struct SampleInfo * GetFirstSampleInfoStructure(void) { return nullptr; }
+extern "C" int InitAudio(void *) { return 0; }
+extern "C" int SetupAudioOptionDefaults(void *) { return 0; }
+extern "C" int IsSamplePlaying(int a1, int a2, int a3) { return 0; }
+extern "C" struct SampleInfo * GetLastSampleInfoStructure(void) { return nullptr; }
+extern "C" int GetCurrentSoundMasterVolume(void) { return 0; }
+extern "C" int StopSample(SoundEmitterID emit_id, long smptbl_id) { return 0; }
+extern "C" int SetSampleVolume(SoundEmitterID emit_id, long smptbl_id,long volume,long d) { return 0; }
+extern "C" int SetSamplePan(SoundEmitterID emit_id, long smptbl_id,long pan,int d) { return 0; }
+extern "C" int SetSamplePitch(SoundEmitterID emit_id, long smptbl_id,long pitch,int d) { return 0; }
+extern "C" struct SampleInfo * PlaySampleFromAddress(SoundEmitterID emit_id, int smpl_idx, int a3, int a4, int a5, unsigned char a6, unsigned char a7, void * buf, int sfxid) { return 0; }
+
+extern "C" short play_smk_(char *fname, int smkflags, int plyflags) { return 0; }
+extern "C" short play_smk_direct(char *fname, int smkflags, int plyflags) { return 0; }
+extern "C" short play_smk_via_buffer(char *fname, int smkflags, int plyflags) { return 0; }
+
+// Exported functions - FLI related
+extern "C" short anim_open(char *fname, int arg1, short arg2, int width, int height, int arg5, unsigned int flags) { return 0; }
+extern "C" short anim_stop(void) { return 0; }
+extern "C" short anim_record(void) { return 0; }
+extern "C" TbBool anim_record_frame(unsigned char *screenbuf, unsigned char *palette) { return 0; }
+
+extern "C" int steam_api_init() { return 0; }
+extern "C" void steam_api_shutdown() {}