diff --git a/rbutil/libtools.make b/rbutil/libtools.make
index 2e3cc6f1e2..054a1c2c5a 100644
--- a/rbutil/libtools.make
+++ b/rbutil/libtools.make
@@ -21,6 +21,11 @@ endif
 
 # Get directory this Makefile is in for relative paths.
 TOP := $(dir $(lastword $(MAKEFILE_LIST)))
+ifeq ($(OS),Windows_NT)
+mkdir = if not exist $(subst /,\,$(1)) mkdir $(subst /,\,$(1))
+else
+mkdir = mkdir -p $(1)
+endif
 
 # overwrite for releases
 APPVERSION ?= $(shell $(TOP)/../tools/version.sh $(TOP)/..)
@@ -93,7 +98,7 @@ $(OBJDIR)$(LIBUCL):
 # building the standalone executable
 $(BINARY): $(OBJS) $(EXTRADEPS) $(addprefix $(OBJDIR),$(EXTRALIBOBJS))
 	@echo LD $@
-#	$(SILENT)mkdir -p $(dir $@)
+	$(SILENT)$(call mkdir,$(dir $@))
 # EXTRADEPS need to be built into OBJDIR.
 	$(SILENT)$(CROSS)$(CC) $(CFLAGS) $(LDOPTS) -o $(BINARY) \
 	    $(OBJS) $(addprefix $(OBJDIR),$(EXTRADEPS)) \
@@ -102,7 +107,7 @@ $(BINARY): $(OBJS) $(EXTRADEPS) $(addprefix $(OBJDIR),$(EXTRALIBOBJS))
 # common rules
 $(OBJDIR)%.o:
 	@echo CC $<
-	$(SILENT)mkdir -p $(dir $@)
+	$(SILENT)$(call mkdir,$(dir $@))
 	$(SILENT)$(CROSS)$(CC) $(CFLAGS) -c -o $@ $<
 
 # lib rules
@@ -116,14 +121,14 @@ dll: $(OUTPUT).dll
 $(OUTPUT).dll: $(TARGET_DIR)$(OUTPUT).dll
 $(TARGET_DIR)$(OUTPUT).dll: $(LIBOBJS) $(addprefix $(OBJDIR),$(EXTRALIBOBJS))
 	@echo DLL $(notdir $@)
-	$(SILENT)mkdir -p $(dir $@)
+	$(SILENT)$(call mkdir,$(dir $@))
 	$(SILENT)$(CROSS)$(CC) $(CFLAGS) -shared -o $@ $^ \
 		    -Wl,--output-def,$(TARGET_DIR)$(OUTPUT).def
 
 # create lib file from objects
 $(TARGET_DIR)lib$(OUTPUT)$(RBARCH).a: $(LIBOBJS) $(addprefix $(OBJDIR),$(EXTRALIBOBJS))
 	@echo AR $(notdir $@)
-	$(SILENT)mkdir -p $(dir $@)
+	$(SILENT)$(call mkdir,$(dir $@))
 	$(SILENT)$(AR) rcs $@ $^
 
 clean:
@@ -138,6 +143,6 @@ $(BIN2C):
 # OS X specifics
 $(OUTPUT).dmg: $(OUTPUT)
 	@echo DMG $@
-	$(SILENT)mkdir -p $(OUTPUT)-dmg
+	$(SILENT)$(call mkdir,$(OUTPUT)-dmg))
 	$(SILENT)cp -p $(OUTPUT) $(OUTPUT)-dmg
 	$(SILENT)hdiutil create -srcfolder $(OUTPUT)-dmg $@
diff --git a/tools/rbspeex/Makefile b/tools/rbspeex/Makefile
index f7f080847d..24a0cedd8c 100644
--- a/tools/rbspeex/Makefile
+++ b/tools/rbspeex/Makefile
@@ -11,6 +11,12 @@ ifndef V
 SILENT = @
 endif
 
+ifeq ($(OS),Windows_NT)
+mkdir = if not exist $(subst /,\,$(1)) mkdir $(subst /,\,$(1))
+else
+mkdir = mkdir -p $(1)
+endif
+
 SPEEXSRC = ../../lib/rbcodec/codecs/libspeex
 
 INCLUDES = -I $(SPEEXSRC)
@@ -124,5 +130,5 @@ clean:
 
 $(BUILD_DIR):
 	@echo MKDIR $(BUILD_DIR)
-	$(SILENT)mkdir $(BUILD_DIR)
+	$(SILENT)$(call mkdir, $(BUILD_DIR))
 
diff --git a/tools/ucl/src/Makefile b/tools/ucl/src/Makefile
index 8a73a53f5f..2d6f18f102 100644
--- a/tools/ucl/src/Makefile
+++ b/tools/ucl/src/Makefile
@@ -12,6 +12,12 @@ ifndef V
 SILENT = @
 endif
 
+ifeq ($(OS),Windows_NT)
+mkdir = if not exist $(subst /,\,$(1)) mkdir $(subst /,\,$(1))
+else
+mkdir = mkdir -p $(1)
+endif
+
 ifdef RBARCH
 CFLAGS += -arch $(RBARCH)
 endif
@@ -59,7 +65,7 @@ $(TARGET_DIR)libucl$(RBARCH).a: $(OBJS)
 
 $(OBJDIR)/%.o: %.c
 	@echo CC $<
-	$(SILENT)mkdir -p $(dir $@)
+	$(SILENT)$(call mkdir, $(dir $@))
 	$(SILENT)$(CROSS)$(CC) $(CFLAGS) -c $< -o $@
 
 clean: