diff --git a/lab1/Makefile b/lab1/Makefile
index 12a7431..9385d8e 100644
--- a/lab1/Makefile
+++ b/lab1/Makefile
@@ -3,9 +3,14 @@ CC = arm-none-eabi-gcc
 # The location of the C compiler
 # ARMGCC_ROOT is used by some makefiles that need to know where the compiler
 # is installed.
-ARMGCC_ROOT := ${shell dirname ${shell readlink ${shell which ${CC}}}}/..
+ARMGCC_BIN := ${shell which ${CC}}
+ifeq (${shell test -h ${ARMGCC_BIN} && echo "true" || echo "false"}, true)
+    ARMGCC_ROOT := ${shell dirname ${shell readlink ${ARMGCC_BIN}}}/..
+else
+    ARMGCC_ROOT := ${shell dirname ${ARMGCC_BIN}}/..
+endif
 
-OBJECTS = main.o system.o startup.o
+OBJECTS = main.o system.o startup.o syscalls.o
 
 NAME = lab
 
@@ -40,6 +45,7 @@ LFLAGS = -Wl,-T,../config.lds \
     --specs=nano.specs
 
 all: $(NAME).out
+	@echo "SUCCESS: Compilation completed successfully."
 
 main.o: main.c
 	@$(CC) $(CFLAGS) -g $< -c -o $@
@@ -50,6 +56,9 @@ system.o: ../system.c
 startup.o: ../startup.c
 	@$(CC) $(CFLAGS) $< -c -o $@
 
+syscalls.o: ../syscalls.c
+	@$(CC) $(CFLAGS) $< -c -o $@
+
 $(NAME).out: $(OBJECTS)
 	@$(CC) $(OBJECTS) $(LFLAGS) -o $(NAME).out
 
diff --git a/lab2/Makefile b/lab2/Makefile
index 06c5834..1a68222 100644
--- a/lab2/Makefile
+++ b/lab2/Makefile
@@ -3,9 +3,14 @@ CC = arm-none-eabi-gcc
 # The location of the C compiler
 # ARMGCC_ROOT is used by some makefiles that need to know where the compiler
 # is installed.
-ARMGCC_ROOT := ${shell dirname ${shell readlink ${shell which ${CC}}}}/..
+ARMGCC_BIN := ${shell which ${CC}}
+ifeq (${shell test -h ${ARMGCC_BIN} && echo "true" || echo "false"}, true)
+    ARMGCC_ROOT := ${shell dirname ${shell readlink ${ARMGCC_BIN}}}/..
+else
+    ARMGCC_ROOT := ${shell dirname ${ARMGCC_BIN}}/..
+endif
 
-OBJECTS = main.o bump.o delay.o clock.o system.o startup.o
+OBJECTS = main.o bump.o delay.o clock.o system.o startup.o syscalls.o
 
 NAME = lab
 
@@ -40,6 +45,7 @@ LFLAGS = -Wl,-T,../config.lds \
     --specs=nano.specs
 
 all: $(NAME).out
+	@echo "SUCCESS: Compilation completed successfully."
 
 main.o: main.c
 	@$(CC) $(CFLAGS) -g $< -c -o $@
@@ -59,6 +65,9 @@ system.o: ../system.c
 startup.o: ../startup.c
 	@$(CC) $(CFLAGS) $< -c -o $@
 
+syscalls.o: ../syscalls.c
+	@$(CC) $(CFLAGS) $< -c -o $@
+
 $(NAME).out: $(OBJECTS)
 	@$(CC) $(OBJECTS) $(LFLAGS) -o $(NAME).out
 
diff --git a/lab3/Makefile b/lab3/Makefile
index 8cd1e5a..7920501 100644
--- a/lab3/Makefile
+++ b/lab3/Makefile
@@ -3,9 +3,14 @@ CC = arm-none-eabi-gcc
 # The location of the C compiler
 # ARMGCC_ROOT is used by some makefiles that need to know where the compiler
 # is installed.
-ARMGCC_ROOT := ${shell dirname ${shell readlink ${shell which ${CC}}}}/..
+ARMGCC_BIN := ${shell which ${CC}}
+ifeq (${shell test -h ${ARMGCC_BIN} && echo "true" || echo "false"}, true)
+    ARMGCC_ROOT := ${shell dirname ${shell readlink ${ARMGCC_BIN}}}/..
+else
+    ARMGCC_ROOT := ${shell dirname ${ARMGCC_BIN}}/..
+endif
 
-OBJECTS = main.o bump.o delay.o clock.o reflectance.o cpu.o system.o startup.o
+OBJECTS = main.o bump.o delay.o clock.o reflectance.o cpu.o system.o startup.o syscalls.o
 
 NAME = lab
 
@@ -40,6 +45,7 @@ LFLAGS = -Wl,-T,../config.lds \
     --specs=nano.specs
 
 all: $(NAME).out
+	@echo "SUCCESS: Compilation completed successfully."
 
 main.o: main.c
 	@$(CC) $(CFLAGS) -g $< -c -o $@
@@ -65,6 +71,9 @@ system.o: ../system.c
 startup.o: ../startup.c
 	@$(CC) $(CFLAGS) $< -c -o $@
 
+syscalls.o: ../syscalls.c
+	@$(CC) $(CFLAGS) $< -c -o $@
+
 $(NAME).out: $(OBJECTS)
 	@$(CC) $(OBJECTS) $(LFLAGS) -o $(NAME).out
 
diff --git a/syscalls.c b/syscalls.c
new file mode 100644
index 0000000..34c0d46
--- /dev/null
+++ b/syscalls.c
@@ -0,0 +1,17 @@
+// Minimal implementations to supress the warnings
+
+int _close(int file) { 
+    return -1; 
+}
+
+int _lseek(int file, int ptr, int dir) {
+    return 0;
+}
+
+int _read(int file, char *ptr, int len) {
+    return 0;
+}
+
+int _write(int file, char *ptr, int len) {
+    return len;
+}