diff --git a/.gitignore b/.gitignore
index 336fb8b..261d9bf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 build
 .zig-cache
-zig-out
\ No newline at end of file
+zig-out
+.cache
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
index c31ab1e..dc05700 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -39,11 +39,14 @@ add_executable(blink
     blink.c
     )
 
+add_library(zig_library STATIC IMPORTED)
+set_property(TARGET zig_library PROPERTY IMPORTED_LOCATION ../zig-out/lib/libpicow_zig.a)
+
 # pull in common dependencies
-target_link_libraries(blink pico_stdlib)
+target_link_libraries(blink zig_library pico_stdlib)
 
 if (PICO_CYW43_SUPPORTED)
-    target_link_libraries(blink pico_cyw43_arch_none)
+    target_link_libraries(blink zig_library pico_cyw43_arch_none)
 endif()
 
 # create map/bin/hex file etc.
diff --git a/blink.c b/blink.c
index e588b0e..0bc59d6 100644
--- a/blink.c
+++ b/blink.c
@@ -5,6 +5,8 @@
  */
 
 #include "pico/stdlib.h"
+#include <stdio.h>
+#include <stdint.h>
 
 // Pico W devices use a GPIO on the WIFI chip for the LED,
 // so when building for Pico W, CYW43_WL_GPIO_LED_PIN will be defined
@@ -41,13 +43,18 @@ void pico_set_led(bool led_on) {
 #endif
 }
 
+extern int32_t add(int32_t a, int32_t b);
+
 int main() {
-    int rc = pico_led_init();
-    hard_assert(rc == PICO_OK);
-    while (true) {
-        pico_set_led(true);
-        sleep_ms(LED_DELAY_MS);
-        pico_set_led(false);
-        sleep_ms(LED_DELAY_MS);
-    }
+    stdio_init_all();
+    printf("result from zig : %d\n", add(10, 31));
+    return 0;
+    // int rc = pico_led_init();
+    // hard_assert(rc == PICO_OK);
+    // while (true) {
+    //     pico_set_led(true);
+    //     sleep_ms(LED_DELAY_MS);
+    //     pico_set_led(false);
+    //     sleep_ms(LED_DELAY_MS);
+    // }
 }
diff --git a/build.zig b/build.zig
index f8530cb..ef21a73 100644
--- a/build.zig
+++ b/build.zig
@@ -40,7 +40,7 @@ pub fn build(b: *std.Build) void {
     // for actually invoking the compiler.
     const lib = b.addLibrary(.{
         .linkage = .static,
-        .name = "blink",
+        .name = "picow_zig",
         .root_module = lib_mod,
     });
 
@@ -49,6 +49,10 @@ pub fn build(b: *std.Build) void {
     // running `zig build`).
     b.installArtifact(lib);
 
+    const ninja_build = b.addSystemCommand(&.{"/home/arkitu/.pico-sdk/ninja/v1.12.1/ninja", "-C", "./build"});
+    ninja_build.setName("ninja : build c");
+
+    b.getInstallStep().dependOn(&ninja_build.step);
 
     // Creates a step for unit testing. This only builds the test executable
     // but does not run it.
diff --git a/build.zig.zon b/build.zig.zon
index 7113ed9..9823c06 100644
--- a/build.zig.zon
+++ b/build.zig.zon
@@ -6,7 +6,7 @@
     //
     // It is redundant to include "zig" in this name because it is already
     // within the Zig package namespace.
-    .name = "blink",
+    .name = "picow_zig",
 
     // This is a [Semantic Version](https://semver.org/).
     // In a future version of Zig it will be used for package deduplication.