diff --git a/test_programs/GNUmakefile.os4 b/test_programs/GNUmakefile.os4
index 955164a..b02e340 100644
--- a/test_programs/GNUmakefile.os4
+++ b/test_programs/GNUmakefile.os4
@@ -21,104 +21,120 @@ WARNINGS = \
 	-Wall -W -Wshadow -Wpointer-arith -Wsign-compare -Wmissing-prototypes \
 	-Wundef -Wbad-function-cast -Wmissing-declarations -Wconversion
 
+V = /V
 INCLUDE = -I$(V)/include -I../library/include
-LIB = -L../library/lib
-#OPTIONS = -DNDEBUG -fno-builtin -DNO_INLINE_STDARG -DIEEE_FLOATING_POINT_SUPPORT
-#OPTIONS = -D__MEM_DEBUG -fno-builtin
- OPTIONS = -DDEBUG -DNO_INLINE_STDARG -fno-builtin
-#OPTIMIZE = -O
-#OPTIMIZE = -O2 -fomit-frame-pointer
-DEBUG = -ggdb
+#OPTIONS = -D__MEM_DEBUG
+#OPTIONS = -DDEBUG
+ OPTIONS = -DNDEBUG
+#OPTIMIZE = -O3
+#DEBUG = -ggdb
 
-CFLAGS = $(WARNINGS) $(OPTIMIZE) $(DEBUG) $(OPTIONS) $(CODE_TYPE) $(INCLUDE) $(LIB)
+# Note: Because the matching startup code needs to be used for
+#       correctly linking the test programs, you need to make sure
+#       that the current development version of clib2 is visible
+#       where the linker expects it (soft link). Some more tuning would be
+#       required here because you really should not need to tinker
+#       with the location of library and the options "-L. -L../library/lib"
+#       should be sufficient.
+
+CFLAGS = -mcrt=clib2 -fno-builtin $(WARNINGS) $(OPTIMIZE) $(DEBUG) $(OPTIONS) $(INCLUDE)
+LFLAGS = -Wl,-d
 
 ##############################################################################
 
-LIBS = -lm -lc -ldebug -lgcc
+LIBS = -ldebug -lm -lc
 
 ##############################################################################
 
 all: test fgets_test iotest sscanf_test printf_test sprintf_test \
 	stack_size_test translate_test strtok_test uname simple \
 	fstat_stdout_test simple_sprintf date_test sscanf_64 \
-	factorial setlocale
+	factorial setlocale rand malloc-test slab-test
 
 clean:
 	$(DELETE) *.o *.map test fgets_test iotest sscanf_test printf_test \
 		sprintf_test stack_size_test translate_test strtok_test \
 		uname simple fstat_stdout_test simple_sprintf date_test \
-		sscanf_64 factorial setlocale rand
+		sscanf_64 factorial setlocale rand malloc-test slab-test
 
 ##############################################################################
 
 setlocale : setlocale.o
 	@echo "Linking $@"
-	$(CC) $(CFLAGS) -o $@ setlocale.o $(LIBS) -Wl,--cref,-M,-Map=$@.map
+	$(CC) $(CFLAGS) -o $@ setlocale.o $(LIBS) $(LFLAGS) -Wl,--cref,-M,-Map=$@.map
 
 test : test.o
 	@echo "Linking $@"
-	$(CC) $(CFLAGS) -o $@ test.o $(LIBS) -Wl,--cref,-M,-Map=$@.map
+	$(CC) $(CFLAGS) -o $@ test.o $(LIBS) $(LFLAGS) -Wl,--cref,-M,-Map=$@.map
 
 date_test : date_test.o
 	@echo "Linking $@"
-	$(CC) $(CFLAGS) -o $@ test.o $(LIBS) -Wl,--cref,-M,-Map=$@.map
+	$(CC) $(CFLAGS) -o $@ test.o $(LIBS) $(LFLAGS) -Wl,--cref,-M,-Map=$@.map
 
 fgets_test : fgets_test.o
 	@echo "Linking $@"
-	$(CC) $(CFLAGS) -o $@ fgets_test.o $(LIBS) -Wl,--cref,-M,-Map=$@.map
+	$(CC) $(CFLAGS) -o $@ fgets_test.o $(LIBS) $(LFLAGS) -Wl,--cref,-M,-Map=$@.map
 
 strtok_test : strtok_test.o
 	@echo "Linking $@"
-	$(CC) $(CFLAGS) -o $@ strtok_test.o $(LIBS) -Wl,--cref,-M,-Map=$@.map
+	$(CC) $(CFLAGS) -o $@ strtok_test.o $(LIBS) $(LFLAGS) -Wl,--cref,-M,-Map=$@.map
 
 iotest : iotest.o
 	@echo "Linking $@"
-	$(CC) $(CFLAGS) -o $@ iotest.o $(LIBS) -Wl,--cref,-M,-Map=$@.map
+	$(CC) $(CFLAGS) -o $@ iotest.o $(LIBS) $(LFLAGS) -Wl,--cref,-M,-Map=$@.map
 
 sscanf_test : sscanf_test.o
 	@echo "Linking $@"
-	$(CC) $(CFLAGS) -o $@ sscanf_test.o $(LIBS) -Wl,--cref,-M,-Map=$@.map
+	$(CC) $(CFLAGS) -o $@ sscanf_test.o $(LIBS) $(LFLAGS) -Wl,--cref,-M,-Map=$@.map
 
 printf_test : printf_test.o
 	@echo "Linking $@"
-	$(CC) $(CFLAGS) -o $@ printf_test.o $(LIBS) -Wl,--cref,-M,-Map=$@.map
+	$(CC) $(CFLAGS) -o $@ printf_test.o $(LIBS) $(LFLAGS) -Wl,--cref,-M,-Map=$@.map
 
 sprintf_test : sprintf_test.o
 	@echo "Linking $@"
-	$(CC) $(CFLAGS) -o $@ sprintf_test.o $(LIBS) -Wl,--cref,-M,-Map=$@.map
+	$(CC) $(CFLAGS) -o $@ sprintf_test.o $(LIBS) $(LFLAGS) -Wl,--cref,-M,-Map=$@.map
 
 stack_size_test : stack_size_test.o
 	@echo "Linking $@"
-	$(CC) $(CFLAGS) -o $@ stack_size_test.o $(LIBS) -Wl,--cref,-M,-Map=$@.map
+	$(CC) $(CFLAGS) -o $@ stack_size_test.o $(LIBS) $(LFLAGS) -Wl,--cref,-M,-Map=$@.map
 
 translate_test : translate_test.o
 	@echo "Linking $@"
-	$(CC) $(CFLAGS) -o $@ translate_test.o -lunix $(LIBS) -Wl,--cref,-M,-Map=$@.map
+	$(CC) $(CFLAGS) -o $@ translate_test.o -lunix $(LIBS) $(LFLAGS) -Wl,--cref,-M,-Map=$@.map
 
 uname : uname.o
 	@echo "Linking $@"
-	$(CC) $(CFLAGS) -o $@ uname.o -lunix $(LIBS) -Wl,--cref,-M,-Map=$@.map
+	$(CC) $(CFLAGS) -o $@ uname.o -lunix $(LIBS) $(LFLAGS) -Wl,--cref,-M,-Map=$@.map
 
 simple : simple.o
 	@echo "Linking $@"
-	$(CC) $(CFLAGS) -o $@ simple.o $(LIBS) -Wl,--cref,-M,-Map=$@.map
+	$(CC) $(CFLAGS) -o $@ simple.o $(LIBS) $(LFLAGS) -Wl,--cref,-M,-Map=$@.map
 
 fstat_stdout_test : fstat_stdout_test.o
 	@echo "Linking $@"
-	$(CC) $(CFLAGS) -o $@ fstat_stdout_test.o $(LIBS) -Wl,--cref,-M,-Map=$@.map
+	$(CC) $(CFLAGS) -o $@ fstat_stdout_test.o $(LIBS) $(LFLAGS) -Wl,--cref,-M,-Map=$@.map
 
 simple_sprintf : simple_sprintf.o
 	@echo "Linking $@"
-	$(CC) -nostdlib $(CFLAGS) -o $@ simple_sprintf.o -lc -lgcc -Wl,--cref,-M,-Map=$@.map
+	$(CC) $(CFLAGS) -nostdlib -o $@ simple_sprintf.o -lc -lgcc $(LFLAGS) -Wl,--cref,-M,-Map=$@.map
 
 sscanf_64 : sscanf_64.o
 	@echo "Linking $@"
-	$(CC) -nostdlib $(CFLAGS) -o $@ sscanf_64.o -lc -lgcc -Wl,--cref,-M,-Map=$@.map
+	$(CC) $(CFLAGS) -o $@ sscanf_64.o $(LIBS) $(LFLAGS) -Wl,--cref,-M,-Map=$@.map
 
 factorial : factorial.o
 	@echo "Linking $@"
-	$(CC) -nostdlib $(CFLAGS) -o $@ factorial.o -lc -lgcc -Wl,--cref,-M,-Map=$@.map
+	$(CC) $(CFLAGS) -o $@ factorial.o $(LIBS) $(LFLAGS) -Wl,--cref,-M,-Map=$@.map
 
 rand : rand.o
 	@echo "Linking $@"
-	$(CC) -nostdlib $(CFLAGS) -o $@ rand.o -lc -lgcc -Wl,--cref,-M,-Map=$@.map
+	$(CC) $(CFLAGS) -o $@ rand.o $(LIBS) $(LFLAGS) -Wl,--cref,-M,-Map=$@.map
+
+malloc-test : malloc-test.o
+	@echo "Linking $@"
+	$(CC) $(CFLAGS) -o $@ malloc-test.o $(LIBS) $(LFLAGS) -Wl,--cref,-M,-Map=$@.map
+
+slab-test : slab-test.o
+	@echo "Linking $@"
+	$(CC) $(CFLAGS) -o $@ slab-test.o $(LIBS) $(LFLAGS) -Wl,--cref,-M,-Map=$@.map