diff --git a/build.mk b/build.mk
index 4c9c71b..3246f12 100644
--- a/build.mk
+++ b/build.mk
@@ -1,10 +1,10 @@
-ifndef BINDIR
-$(error BINDIR is not defined in the Makefile)
+ifndef OUTDIR
+OUTDIR = bin
 endif
 
 
 ifndef OBJDIR
-OBJDIR = $(BINDIR)/obj
+OBJDIR = $(OUTDIR)/obj
 endif
 
 
@@ -41,7 +41,7 @@
 #update CFLAGS and LDFLAGS
 CFLAGS += $(PLATFORM_CFLAGS) $(ARCH_CFLAGS) $(OPT_CFLAGS) -O$(OPTLEVEL) -g$(DBGLEVEL) $(addprefix -I, $(INCDIRS)) $(addprefix -D, $(CPPDEFS))
 CXXFLAGS += $(PLATFORM_CXXFLAGS) $(ARCH_CFLAGS) $(OPT_CFLAGS) -O$(OPTLEVEL) -g$(DBGLEVEL) $(addprefix -I, $(INCDIRS)) $(addprefix -D, $(CPPDEFS))
-LDFLAGS += $(PLATFORM_LDFLAGS) $(ARCH_CFLAGS) $(OPT_CFLAGS) -O$(OPTLEVEL) -g$(DBGLEVEL) -Wl,-Map=$(BINDIR)/$(TARGET).map,--gc-sections,--cref
+LDFLAGS += $(PLATFORM_LDFLAGS) $(ARCH_CFLAGS) $(OPT_CFLAGS) -O$(OPTLEVEL) -g$(DBGLEVEL) -Wl,-Map=$(OUTDIR)/$(TARGET).map,--gc-sections,--cref
 
 #create list of all objects
 ALLOBJS = $(addprefix $(OBJDIR)/, $(patsubst %.s, %.o, $(notdir $(ASRCS)))) $(addprefix $(OBJDIR)/, $(patsubst %.c, %.o, $(notdir $(CSRCS)))) $(addprefix $(OBJDIR)/, $(patsubst %.cpp, %.o, $(notdir $(CXXSRCS))))
@@ -130,67 +130,67 @@
 
 clean: user_clean_target
 	@$(ECHO) Cleaning application files ...
-	-$(RM) -rf $(BINDIR) $(OBJDIR)
+	-$(RM) -rf $(OUTDIR) $(OBJDIR)
 
 
-$(BINDIR)/$(TARGET_VER).elf: $(MAKEFILE_LIST) $(ALLOBJS) $(COMPONENT_LIBS) $(LIBS) $(LINKER_SCRIPT) | $(BINDIR)/
+$(OUTDIR)/$(TARGET_VER).elf: $(MAKEFILE_LIST) $(ALLOBJS) $(COMPONENT_LIBS) $(LIBS) $(LINKER_SCRIPT) | $(OUTDIR)/
 	@$(ECHO) "Linking ..."
 ifdef LINKER_SCRIPT
-	$(CC) -o $(BINDIR)/$(TARGET_VER).elf -T$(LINKER_SCRIPT) $(ALLOBJS) $(COMPONENT_LIBS) $(LIBS) $(LDFLAGS)
+	$(CC) -o $(OUTDIR)/$(TARGET_VER).elf -T$(LINKER_SCRIPT) $(ALLOBJS) $(COMPONENT_LIBS) $(LIBS) $(LDFLAGS)
 else
-	$(CC) -o $(BINDIR)/$(TARGET_VER).elf $(ALLOBJS) $(LIBS) $(LDFLAGS)
+	$(CC) -o $(OUTDIR)/$(TARGET_VER).elf $(ALLOBJS) $(LIBS) $(LDFLAGS)
 endif
 ifndef NO_SYM
-	$(NM) -t d -S --size-sort $(BINDIR)/$(TARGET_VER).elf > $(BINDIR)/$(TARGET_VER).sym
+	$(NM) -t d -S --size-sort $(OUTDIR)/$(TARGET_VER).elf > $(OUTDIR)/$(TARGET_VER).sym
 endif
 ifndef NO_LST
-	$(OBJDUMP) -xds -S -l $(BINDIR)/$(TARGET_VER).elf > $(BINDIR)/$(TARGET_VER).lst
+	$(OBJDUMP) -xds -S -l $(OUTDIR)/$(TARGET_VER).elf > $(OUTDIR)/$(TARGET_VER).lst
 endif
 ifeq ($(RELEASE), yes)
-	$(STRIP) --strip-debug --strip-unneeded $(BINDIR)/$(TARGET_VER).elf
+	$(STRIP) --strip-debug --strip-unneeded $(OUTDIR)/$(TARGET_VER).elf
 endif
 ifndef NO_SIZE
-	@$(SIZE) -A -d $(BINDIR)/$(TARGET_VER).elf
+	@$(SIZE) -A -d $(OUTDIR)/$(TARGET_VER).elf
 endif
 	$(EMPTY_LINE)
 
 
-$(BINDIR)/$(TARGET_VER).a: $(MAKEFILE_LIST) $(ALLOBJS) | $(BINDIR)/
+$(OUTDIR)/$(TARGET_VER).a: $(MAKEFILE_LIST) $(ALLOBJS) | $(OUTDIR)/
 	@$(ECHO) "Creating static library ..."
-	$(AR) rcs $(BINDIR)/$(TARGET_VER).a $(ALLOBJS)
+	$(AR) rcs $(OUTDIR)/$(TARGET_VER).a $(ALLOBJS)
 ifndef NO_SYM
-	$(NM) -t d -S --size-sort $(BINDIR)/$(TARGET_VER).a > $(BINDIR)/$(TARGET_VER)_a.sym
+	$(NM) -t d -S --size-sort $(OUTDIR)/$(TARGET_VER).a > $(OUTDIR)/$(TARGET_VER)_a.sym
 endif
 ifndef NO_LST
-	$(OBJDUMP) -xds -S -l $(BINDIR)/$(TARGET_VER).a > $(BINDIR)/$(TARGET_VER)_a.lst
+	$(OBJDUMP) -xds -S -l $(OUTDIR)/$(TARGET_VER).a > $(OUTDIR)/$(TARGET_VER)_a.lst
 endif
 ifeq ($(RELEASE), yes)
-	$(STRIP) --strip-debug --strip-unneeded $(BINDIR)/$(TARGET_VER).a
+	$(STRIP) --strip-debug --strip-unneeded $(OUTDIR)/$(TARGET_VER).a
 endif
 	@$(ECHO)
 
 
-$(BINDIR)/$(TARGET_VER).so: $(MAKEFILE_LIST) $(ALLOBJS) | $(BINDIR)/
+$(OUTDIR)/$(TARGET_VER).so: $(MAKEFILE_LIST) $(ALLOBJS) | $(OUTDIR)/
 	@$(ECHO) "Creating shared library ..."
 ifdef LINKER_SCRIPT
-	$(CC) -o $(BINDIR)/$(TARGET_VER).so -T$(LINKER_SCRIPT) $(ALLOBJS) $(COMPONENT_LIBS) $(LIBS) $(LDFLAGS) -rdynamic -shared -Wl,-soname,$(TARGET).so
+	$(CC) -o $(OUTDIR)/$(TARGET_VER).so -T$(LINKER_SCRIPT) $(ALLOBJS) $(COMPONENT_LIBS) $(LIBS) $(LDFLAGS) -rdynamic -shared -Wl,-soname,$(TARGET).so
 else
-	$(CC) -o $(BINDIR)/$(TARGET_VER).so $(ALLOBJS) $(LIBS) $(LDFLAGS) -rdynamic -shared -Wl,-soname,$(TARGET).so
+	$(CC) -o $(OUTDIR)/$(TARGET_VER).so $(ALLOBJS) $(LIBS) $(LDFLAGS) -rdynamic -shared -Wl,-soname,$(TARGET).so
 endif
 ifndef NO_SYM
-	$(NM) -t d -S --size-sort $(BINDIR)/$(TARGET_VER).so > $(BINDIR)/$(TARGET_VER)_so.sym
+	$(NM) -t d -S --size-sort $(OUTDIR)/$(TARGET_VER).so > $(OUTDIR)/$(TARGET_VER)_so.sym
 endif
 ifndef NO_LST
-	$(OBJDUMP) -xds -S -l $(BINDIR)/$(TARGET_VER).so > $(BINDIR)/$(TARGET_VER)_so.lst
+	$(OBJDUMP) -xds -S -l $(OUTDIR)/$(TARGET_VER).so > $(OUTDIR)/$(TARGET_VER)_so.lst
 endif
 ifeq ($(RELEASE), yes)
-	$(STRIP) --strip-debug --strip-unneeded $(BINDIR)/$(TARGET_VER).so
+	$(STRIP) --strip-debug --strip-unneeded $(OUTDIR)/$(TARGET_VER).so
 endif
 	@$(ECHO)
 
 
 $(foreach dir, $(OBJDIR), $(eval $(call CREATE_DIRECTORY, $(dir))))
-$(eval $(call CREATE_DIRECTORY, $(BINDIR)))
+$(eval $(call CREATE_DIRECTORY, $(OUTDIR)))
 
 $(foreach source, $(ASRCS), $(eval $(call COMPILE_ASM_SOURCE, $(OBJDIR)/$(notdir $(source:%.s=%.o)), $(source), $(CFLAGS))))
 $(foreach source, $(CSRCS), $(eval $(call COMPILE_C_SOURCE, $(OBJDIR)/$(notdir $(source:%.c=%.o)), $(source), $(CFLAGS))))
diff --git a/config_cortex_m0.mk b/config_cortex_m0.mk
index 3ef0ecb..5bb47ca 100644
--- a/config_cortex_m0.mk
+++ b/config_cortex_m0.mk
@@ -24,8 +24,8 @@
 
 define CONFIG_TARGETS
 
-$(BINDIR)/$(TARGET_VER).hex: $(BINDIR)/$(TARGET_VER).elf | $(BINDIR)/
-	$(OBJCOPY) -O ihex $(BINDIR)/$(TARGET_VER).elf $(BINDIR)/$(TARGET_VER).hex
+$(OUTDIR)/$(TARGET_VER).hex: $(OUTDIR)/$(TARGET_VER).elf | $(OUTDIR)/
+	$(OBJCOPY) -O ihex $(OUTDIR)/$(TARGET_VER).elf $(OUTDIR)/$(TARGET_VER).hex
 	@echo
 	
 endef
diff --git a/config_cortex_m3.mk b/config_cortex_m3.mk
index 7ae4d2b..029dcf8 100644
--- a/config_cortex_m3.mk
+++ b/config_cortex_m3.mk
@@ -24,8 +24,8 @@
 
 define CONFIG_TARGETS
 
-$(BINDIR)/$(TARGET_VER).hex: $(BINDIR)/$(TARGET_VER).elf | $(BINDIR)/
-	$(OBJCOPY) -O ihex $(BINDIR)/$(TARGET_VER).elf $(BINDIR)/$(TARGET_VER).hex
+$(OUTDIR)/$(TARGET_VER).hex: $(OUTDIR)/$(TARGET_VER).elf | $(OUTDIR)/
+	$(OBJCOPY) -O ihex $(OUTDIR)/$(TARGET_VER).elf $(OUTDIR)/$(TARGET_VER).hex
 	@echo
 
 endef
diff --git a/config_cortex_m4.mk b/config_cortex_m4.mk
index c56d3d8..9e10343 100644
--- a/config_cortex_m4.mk
+++ b/config_cortex_m4.mk
@@ -23,8 +23,8 @@
 
 define CONFIG_TARGETS
 
-$(BINDIR)/$(TARGET_VER).hex: $(BINDIR)/$(TARGET_VER).elf | $(BINDIR)/
-	$(OBJCOPY) -O ihex $(BINDIR)/$(TARGET_VER).elf $(BINDIR)/$(TARGET_VER).hex
+$(OUTDIR)/$(TARGET_VER).hex: $(OUTDIR)/$(TARGET_VER).elf | $(OUTDIR)/
+	$(OBJCOPY) -O ihex $(OUTDIR)/$(TARGET_VER).elf $(OUTDIR)/$(TARGET_VER).hex
 	@echo
 
 endef
diff --git a/config_cortex_m4f.mk b/config_cortex_m4f.mk
index 5048b3b..176b52b 100644
--- a/config_cortex_m4f.mk
+++ b/config_cortex_m4f.mk
@@ -24,8 +24,8 @@
 
 define CONFIG_TARGETS
 
-$(BINDIR)/$(TARGET_VER).hex: $(BINDIR)/$(TARGET_VER).elf | $(BINDIR)/
-	$(OBJCOPY) -O ihex $(BINDIR)/$(TARGET_VER).elf $(BINDIR)/$(TARGET_VER).hex
+$(OUTDIR)/$(TARGET_VER).hex: $(OUTDIR)/$(TARGET_VER).elf | $(OUTDIR)/
+	$(OBJCOPY) -O ihex $(OUTDIR)/$(TARGET_VER).elf $(OUTDIR)/$(TARGET_VER).hex
 	@echo
 
 endef
diff --git a/config_cortex_m7.mk b/config_cortex_m7.mk
index ee671bd..7b5401a 100644
--- a/config_cortex_m7.mk
+++ b/config_cortex_m7.mk
@@ -24,8 +24,8 @@
 
 define CONFIG_TARGETS
 
-$(BINDIR)/$(TARGET_VER).hex: $(BINDIR)/$(TARGET_VER).elf | $(BINDIR)/
-	$(OBJCOPY) -O ihex $(BINDIR)/$(TARGET_VER).elf $(BINDIR)/$(TARGET_VER).hex
+$(OUTDIR)/$(TARGET_VER).hex: $(OUTDIR)/$(TARGET_VER).elf | $(OUTDIR)/
+	$(OBJCOPY) -O ihex $(OUTDIR)/$(TARGET_VER).elf $(OUTDIR)/$(TARGET_VER).hex
 	@echo
 
 endef
diff --git a/config_linux.mk b/config_linux.mk
index ec78307..ed992f3 100644
--- a/config_linux.mk
+++ b/config_linux.mk
@@ -21,12 +21,12 @@
 PLATFORM_LDFLAGS = 
 
 define CONFIG_TARGETS
-$(BINDIR)/$(TARGET_VER): $(BINDIR)/$(TARGET_VER).elf | $(BINDIR)/
-	@$(CP) -av $(BINDIR)/$(TARGET_VER).elf $(BINDIR)/$(TARGET_VER)
+$(OUTDIR)/$(TARGET_VER): $(OUTDIR)/$(TARGET_VER).elf | $(OUTDIR)/
+	@$(CP) -av $(OUTDIR)/$(TARGET_VER).elf $(OUTDIR)/$(TARGET_VER)
 
 ifdef BUILD_VERSION
-$(BINDIR)/$(TARGET): $(BINDIR)/$(TARGET_VER).elf | $(BINDIR)/
-	@$(CP) -av $(BINDIR)/$(TARGET_VER).elf $(BINDIR)/$(TARGET)
+$(OUTDIR)/$(TARGET): $(OUTDIR)/$(TARGET_VER).elf | $(OUTDIR)/
+	@$(CP) -av $(OUTDIR)/$(TARGET_VER).elf $(OUTDIR)/$(TARGET)
 endif
 endef