diff --git a/Makefile b/Makefile
index 7ff6614..a779750 100644
--- a/Makefile
+++ b/Makefile
@@ -24,6 +24,7 @@ endif
 #=======================
 
 CFLAGS += -Iinclude -Ilib
+CFLAGS += -Llib -lxy
 
 ifeq ($(On-Windows), 1)
 	CLANG_FLAGS = -target x86_64-pc-windows-gnu
@@ -71,6 +72,14 @@ all:
 CI: all
 	@mv $(Target-Name) $(CI_ARTIFACT_NAME)
 
+libxy: lib/libxy.a lib/libxy.so
+lib/libxy.a:
+	@cd lib; $(CC) -c $(_C_Warning_Flags) xy.c; $(AR) rcs libxy.a xy.o
+	@echo Compile done: libxy.a
+lib/libxy.so:
+	@cd lib; $(CC) -fPIC -shared -o libxy.so xy.c
+	@echo Compile done: libxy.so
+
 
 debug: CFLAGS += -g
 debug: all
@@ -78,7 +87,7 @@ debug: all
 
 test: test-xy test-fw
 
-test-xy:
+test-xy: libxy
 	@$(CC) test/xy.c $(CFLAGS) -o xy
 	@./xy
 
diff --git a/lib/xy.h b/lib/xy.h
index 6f40ca2..c7ed53a 100644
--- a/lib/xy.h
+++ b/lib/xy.h
@@ -107,7 +107,7 @@ void p (const char *s);
 /******************************************************
  *                      Memory
  ******************************************************/
-inline void * xy_malloc0 (size_t size);
+void * xy_malloc0 (size_t size);
 
 
 
diff --git a/test/xy.c b/test/xy.c
index d342e9b..28338c0 100644
--- a/test/xy.c
+++ b/test/xy.c
@@ -8,7 +8,7 @@
  * Created On    : <2023-08-30>
  * Last Modified : <2024-12-14>
  *
- * Test xy.h
+ * Test xy
  * ------------------------------------------------------------*/
 
 #include "xy.h"
@@ -89,8 +89,8 @@ main (int argc, char const *argv[])
   assert (xy_dir_exist ("~"));
   if (xy_on_windows)
     {
-      assert (xy_file_exist (xy_win_powershell_profile));
-      assert (true == xy_file_exist (xy_win_powershellv5_profile));
+      assert (xy_file_exist (xy_win_powershell_profile()));
+      assert (true == xy_file_exist (xy_win_powershellv5_profile()));
       assert (xy_dir_exist ("C:\\Users"));
     }
   else