diff --git a/src/sdhlt/Makefile b/src/sdhlt/Makefile
new file mode 100644
index 00000000..42d93336
--- /dev/null
+++ b/src/sdhlt/Makefile
@@ -0,0 +1,322 @@
+
+#
+# Makefile for Linux GNU compiler
+#
+# Usage:
+#   make            - Build all tools. They will be copied into 'bin' directory.
+#   make clean      - Clean.
+#   make sdHLCSG      - Build sdHLCSG.
+#   make sdHLBSP      - Build sdHLBSP.
+#   make sdHLVIS      - Build sdHLVIS.
+#   make sdHLRAD      - Build sdHLRAD.
+#   make sdRIPENT     - Build sdRIPENT.
+#
+# Before running the tools, please make sure the default maximum stack size on your computer
+#   is more than 4MB.
+#
+# When compiling with g++:
+#   Flag '-fno-strict-aliasing' is a must.
+#   All macro definitions should not be changed, because all code were written and checked under this assumption.
+#   The following warnings should be ignored:
+#     warning: no newline at end of file
+#     warning: '???' may be used uninitialized in this function
+#     warning: suggest parentheses around assignment used as truth value
+#     warning: passing ‘float’ for argument 1 to ‘void seconds_to_hhmm(unsigned int, unsigned int&, unsigned int&, unsigned int&, unsigned int&)’
+#     warning: ignoring #pragma warning
+#     warning: comparison between signed and unsigned integer expressions
+#     warning: enumeration value ‘???’ not handled in switch
+#     warning: unused variable ‘???’
+#     warning: converting to ‘int’ from ‘vec_t’
+#
+
+
+
+
+
+
+
+
+#
+# Common .cpp and .h files for all projects
+#
+
+COMMON_CPPFILES = \
+			common/blockmem.cpp \
+			common/bspfile.cpp \
+			common/cmdlib.cpp \
+			common/cmdlinecfg.cpp \
+			common/filelib.cpp \
+			common/log.cpp \
+			common/mathlib.cpp \
+			common/messages.cpp \
+			common/scriplib.cpp \
+			common/threads.cpp \
+			common/winding.cpp \
+
+COMMON_INCLUDEDIRS = \
+			template \
+			common \
+
+COMMON_INCLUDEFILES = \
+			template/basictypes.h \
+			common/blockmem.h \
+			common/boundingbox.h \
+			common/bspfile.h \
+			common/cmdlib.h \
+			common/cmdlinecfg.h \
+			common/filelib.h \
+			common/hlassert.h \
+			common/log.h \
+			common/mathlib.h \
+			common/mathtypes.h \
+			common/messages.h \
+			common/scriplib.h \
+			common/threads.h \
+			common/win32fix.h \
+			common/winding.h \
+
+COMMON_DEFINITIONS = \
+			VERSION_LINUX \
+			SYSTEM_POSIX \
+			NDEBUG \
+			STDC_HEADERS \
+			HAVE_FCNTL_H \
+			HAVE_PTHREAD_H \
+			HAVE_SYS_RESOURCE_H \
+			HAVE_SYS_STAT_H \
+			HAVE_SYS_TIME_H \
+			HAVE_UNISTD_H \
+
+COMMON_FLAGS = -Wall -O2 -fno-strict-aliasing -pthread -pipe
+
+#
+# Specific .cpp and .h files for hlcsg, hlbsp, hlvis, hlrad and ripent
+#
+
+HLCSG_CPPFILES = \
+			$(COMMON_CPPFILES) \
+			sdHLCSG/ansitoutf8.cpp \
+			sdHLCSG/autowad.cpp \
+			sdHLCSG/brush.cpp \
+			sdHLCSG/brushunion.cpp \
+			sdHLCSG/hullfile.cpp \
+			sdHLCSG/map.cpp \
+			sdHLCSG/properties.cpp \
+			sdHLCSG/qcsg.cpp \
+			sdHLCSG/textures.cpp \
+			sdHLCSG/wadcfg.cpp \
+			sdHLCSG/wadinclude.cpp \
+			sdHLCSG/wadpath.cpp \
+
+HLCSG_INCLUDEDIRS = \
+			$(COMMON_INCLUDEDIRS) \
+			sdHLCSG \
+
+HLCSG_INCLUDEFILES = \
+			$(COMMON_INCLUDEFILES) \
+			sdHLCSG/csg.h \
+			sdHLCSG/wadpath.h \
+
+HLCSG_DEFINITIONS = \
+			$(COMMON_DEFINITIONS) \
+			SDHLCSG \
+			DOUBLEVEC_T \
+			
+HLBSP_CPPFILES = \
+			$(COMMON_CPPFILES) \
+			sdHLBSP/brink.cpp \
+			sdHLBSP/merge.cpp \
+			sdHLBSP/outside.cpp \
+			sdHLBSP/portals.cpp \
+			sdHLBSP/qbsp.cpp \
+			sdHLBSP/solidbsp.cpp \
+			sdHLBSP/surfaces.cpp \
+			sdHLBSP/tjunc.cpp \
+			sdHLBSP/writebsp.cpp \
+
+HLBSP_INCLUDEDIRS = \
+			$(COMMON_INCLUDEDIRS) \
+			sdHLBSP \
+
+HLBSP_INCLUDEFILES = \
+			$(COMMON_INCLUDEFILES) \
+			sdHLBSP/bsp5.h \
+
+HLBSP_DEFINITIONS = \
+			$(COMMON_DEFINITIONS) \
+			SDHLBSP \
+			DOUBLEVEC_T \
+
+HLVIS_CPPFILES = \
+			$(COMMON_CPPFILES) \
+			sdHLVIS/flow.cpp \
+			sdHLVIS/vis.cpp \
+			sdHLVIS/zones.cpp \
+
+HLVIS_INCLUDEDIRS = \
+			$(COMMON_INCLUDEDIRS) \
+			sdHLVIS \
+
+HLVIS_INCLUDEFILES = \
+			$(COMMON_INCLUDEFILES) \
+			sdHLVIS/vis.h \
+			sdHLVIS/zones.h \
+
+HLVIS_DEFINITIONS = \
+			$(COMMON_DEFINITIONS) \
+			SDHLVIS \
+
+HLRAD_CPPFILES = \
+			$(COMMON_CPPFILES) \
+			sdHLRAD/compress.cpp \
+			sdHLRAD/lerp.cpp \
+			sdHLRAD/lightmap.cpp \
+			sdHLRAD/loadtextures.cpp \
+			sdHLRAD/mathutil.cpp \
+			sdHLRAD/nomatrix.cpp \
+			sdHLRAD/qrad.cpp \
+			sdHLRAD/qradutil.cpp \
+			sdHLRAD/sparse.cpp \
+			sdHLRAD/trace.cpp \
+			sdHLRAD/transfers.cpp \
+			sdHLRAD/transparency.cpp \
+			sdHLRAD/vismatrix.cpp \
+			sdHLRAD/vismatrixutil.cpp \
+
+HLRAD_INCLUDEDIRS = \
+			$(COMMON_INCLUDEDIRS) \
+			sdHLRAD \
+
+HLRAD_INCLUDEFILES = \
+			$(COMMON_INCLUDEFILES) \
+			common/anorms.h \
+			sdHLRAD/compress.h \
+			sdHLRAD/qrad.h \
+
+HLRAD_DEFINITIONS = \
+			$(COMMON_DEFINITIONS) \
+			SDHLRAD \
+
+RIPENT_CPPFILES = \
+			$(COMMON_CPPFILES) \
+			sdRIPENT/ripent.cpp \
+
+RIPENT_INCLUDEDIRS = \
+			$(COMMON_INCLUDEDIRS) \
+			sdRIPENT \
+
+RIPENT_INCLUDEFILES = \
+			$(COMMON_INCLUDEFILES) \
+			sdRIPENT/ripent.h \
+
+RIPENT_DEFINITIONS = \
+			$(COMMON_DEFINITIONS) \
+			SDRIPENT \
+
+#
+# Build commands
+#
+
+.PHONY : all
+all : bin/sdHLCSG bin/sdHLBSP bin/sdHLVIS bin/sdHLRAD bin/sdRIPENT printusage
+	@echo ======== OK ========
+
+.PHONY : sdHLCSG
+sdHLCSG : bin/sdHLCSG printusage
+	@echo ======== OK ========
+
+.PHONY : sdHLBSP
+sdHLBSP : bin/sdHLBSP printusage
+	@echo ======== OK ========
+
+.PHONY : sdHLVIS
+sdHLVIS : bin/sdHLVIS printusage
+	@echo ======== OK ========
+
+.PHONY : sdHLRAD
+sdHLRAD : bin/sdHLRAD printusage
+	@echo ======== OK ========
+
+.PHONY : sdRIPENT
+sdRIPENT : bin/sdRIPENT printusage
+	@echo ======== OK ========
+
+bin/sdHLCSG : $(HLCSG_CPPFILES:%.cpp=sdHLCSG/release/%.o) printusage
+	@echo ======== sdHLCSG : linking ========
+	mkdir -p sdHLCSG/release/bin
+	g++ $(COMMON_FLAGS) -o sdHLCSG/release/bin/sdHLCSG $(addprefix -I,$(HLCSG_INCLUDEDIRS)) $(addprefix -D,$(HLCSG_DEFINITIONS)) $(HLCSG_CPPFILES:%.cpp=sdHLCSG/release/%.o)
+	mkdir -p bin
+	cp sdHLCSG/release/bin/sdHLCSG bin/sdHLCSG
+
+$(HLCSG_CPPFILES:%.cpp=sdHLCSG/release/%.o) : sdHLCSG/release/%.o : %.cpp $(HLCSG_INCLUDEFILES) printusage
+	@echo ======== sdHLCSG : compiling $< ========
+	mkdir -p $(dir $@)
+	g++ -c $(COMMON_FLAGS) -o $@ $(addprefix -I,$(HLCSG_INCLUDEDIRS)) $(addprefix -D,$(HLCSG_DEFINITIONS)) $<
+
+bin/sdHLBSP : $(HLBSP_CPPFILES:%.cpp=sdHLBSP/release/%.o) printusage
+	@echo ======== sdHLBSP : linking ========
+	mkdir -p sdHLBSP/release/bin
+	g++ $(COMMON_FLAGS) -o sdHLBSP/release/bin/sdHLBSP $(addprefix -I,$(HLBSP_INCLUDEDIRS)) $(addprefix -D,$(HLBSP_DEFINITIONS)) $(HLBSP_CPPFILES:%.cpp=sdHLBSP/release/%.o)
+	mkdir -p bin
+	cp sdHLBSP/release/bin/sdHLBSP bin/sdHLBSP
+
+$(HLBSP_CPPFILES:%.cpp=sdHLBSP/release/%.o) : sdHLBSP/release/%.o : %.cpp $(HLBSP_INCLUDEFILES) printusage
+	@echo ======== sdHLBSP : compiling $< ========
+	mkdir -p $(dir $@)
+	g++ -c $(COMMON_FLAGS) -o $@ $(addprefix -I,$(HLBSP_INCLUDEDIRS)) $(addprefix -D,$(HLBSP_DEFINITIONS)) $<
+
+bin/sdHLVIS : $(HLVIS_CPPFILES:%.cpp=sdHLVIS/release/%.o) printusage
+	@echo ======== sdHLVIS : linking ========
+	mkdir -p sdHLVIS/release/bin
+	g++ $(COMMON_FLAGS) -o sdHLVIS/release/bin/sdHLVIS $(addprefix -I,$(HLVIS_INCLUDEDIRS)) $(addprefix -D,$(HLVIS_DEFINITIONS)) $(HLVIS_CPPFILES:%.cpp=sdHLVIS/release/%.o)
+	mkdir -p bin
+	cp sdHLVIS/release/bin/sdHLVIS bin/sdHLVIS
+
+$(HLVIS_CPPFILES:%.cpp=sdHLVIS/release/%.o) : sdHLVIS/release/%.o : %.cpp $(HLVIS_INCLUDEFILES) printusage
+	@echo ======== sdHLVIS : compiling $< ========
+	mkdir -p $(dir $@)
+	g++ -c $(COMMON_FLAGS) -o $@ $(addprefix -I,$(HLVIS_INCLUDEDIRS)) $(addprefix -D,$(HLVIS_DEFINITIONS)) $<
+
+bin/sdHLRAD : $(HLRAD_CPPFILES:%.cpp=sdHLRAD/release/%.o) printusage
+	@echo ======== sdHLRAD : linking ========
+	mkdir -p sdHLRAD/release/bin
+	g++ $(COMMON_FLAGS) -o sdHLRAD/release/bin/sdHLRAD $(addprefix -I,$(HLRAD_INCLUDEDIRS)) $(addprefix -D,$(HLRAD_DEFINITIONS)) $(HLRAD_CPPFILES:%.cpp=sdHLRAD/release/%.o)
+	mkdir -p bin
+	cp sdHLRAD/release/bin/sdHLRAD bin/sdHLRAD
+
+$(HLRAD_CPPFILES:%.cpp=sdHLRAD/release/%.o) : sdHLRAD/release/%.o : %.cpp $(HLRAD_INCLUDEFILES) printusage
+	@echo ======== sdHLRAD : compiling $< ========
+	mkdir -p $(dir $@)
+	g++ -c $(COMMON_FLAGS) -o $@ $(addprefix -I,$(HLRAD_INCLUDEDIRS)) $(addprefix -D,$(HLRAD_DEFINITIONS)) $<
+
+bin/sdRIPENT : $(RIPENT_CPPFILES:%.cpp=sdRIPENT/release/%.o) printusage
+	@echo ======== sdRIPENT : linking ========
+	mkdir -p sdRIPENT/release/bin
+	g++ $(COMMON_FLAGS) -o sdRIPENT/release/bin/sdRIPENT $(addprefix -I,$(RIPENT_INCLUDEDIRS)) $(addprefix -D,$(RIPENT_DEFINITIONS)) $(RIPENT_CPPFILES:%.cpp=sdRIPENT/release/%.o)
+	mkdir -p bin
+	cp sdRIPENT/release/bin/sdRIPENT bin/sdRIPENT
+
+$(RIPENT_CPPFILES:%.cpp=sdRIPENT/release/%.o) : sdRIPENT/release/%.o : %.cpp $(RIPENT_INCLUDEFILES) printusage
+	@echo ======== sdRIPENT : compiling $< ========
+	mkdir -p $(dir $@)
+	g++ -c $(COMMON_FLAGS) -o $@ $(addprefix -I,$(RIPENT_INCLUDEDIRS)) $(addprefix -D,$(RIPENT_DEFINITIONS)) $<
+
+.PHONY : printusage
+printusage :
+	head -n 35 Makefile
+
+#
+# Clean
+#
+
+.PHONY : clean
+clean : printusage
+	rm -rf sdHLCSG/release
+	rm -rf sdHLBSP/release
+	rm -rf sdHLVIS/release
+	rm -rf sdHLRAD/release
+	rm -rf sdRIPENT/release
+	rm -rf bin
+	@echo ======== OK ========
+
+