diff --git a/config.mk b/config.mk
index db4d098..f16d87e 100644
--- a/config.mk
+++ b/config.mk
@@ -23,8 +23,13 @@ endif
 endif
 endif
 
-ifneq ($(firstword $(filter %-mingw32 %-cygwin,$(DUMPMACHINE))),)
+ifeq ($(firstword $(filter %-mingw32 %-cygwin,$(DUMPMACHINE))),)
+  DLL_LDFLAGS = -fPIC -shared
+  DLL_SUFFIX := .so
+else
+  DLL_LDFLAGS = -shared -Wl,--out-implib,$@.a
   EXE_SUFFIX := .exe
+  DLL_SUFFIX := .dll
 ifneq ($(firstword $(filter i686-%,$(DUMPMACHINE))),)
   XLDFLAGS += -Wl,--large-address-aware
 endif
diff --git a/libhashset/Makefile b/libhashset/Makefile
index 48f56d4..6106539 100644
--- a/libhashset/Makefile
+++ b/libhashset/Makefile
@@ -10,6 +10,7 @@ ALL_PATH := $(SRC_PATH) $(OBJ_PATH) $(LIB_PATH)
 SRC_FILE := $(wildcard $(SRC_PATH)/*.c)
 OBJ_FILE := $(addprefix $(OBJ_PATH)/,$(patsubst %.c,%.o,$(notdir $(SRC_FILE))))
 LIB_FILE := $(LIB_PATH)/libhashset-1.a
+DLL_FILE := $(LIB_PATH)/libhashset-1$(DLL_SUFFIX)
 
 .PHONY: all build clean test
 
@@ -17,10 +18,13 @@ all: clean build
 
 test: build
 
-build: $(ALL_PATH) $(LIB_FILE)
+build: $(ALL_PATH) $(LIB_FILE) $(DLL_FILE)
 
 $(LIB_FILE): $(OBJ_FILE)
-	$(AR) rcs $@ $(OBJ_FILE)
+	$(AR) rcs $@ $^
+
+$(DLL_FILE): $(SRC_FILE)
+	$(CC) $(CFLAGS) $(DLL_LDFLAGS) -o $@ $^
 
 $(OBJ_FILE):
 	$(CC) $(CFLAGS) -c $(SRC_PATH)/$(patsubst %.o,%.c,$(notdir $@)) -o $@
@@ -29,4 +33,4 @@ $(ALL_PATH):
 	mkdir -p $@
 
 clean:
-	rm -vf $(LIB_FILE) $(OBJ_PATH)/*.o
+	rm -vf $(LIB_FILE) $(DLL_FILE) $(DLL_FILE).a $(OBJ_PATH)/*.o