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libs/lib2/CMakeLists.txt

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+# Defines a static library target named 'lib2' from its source file.
+add_library(lib2 STATIC src/lib2.c)
+
+# Specifies include directories that are part of lib2's public interface.
+# - PUBLIC: Means that targets linking to lib2 (like cmake_tutorialApp or lib1) will
+#           inherit this include path. This allows them to find lib2.h.
+target_include_directories(lib2 PUBLIC
+    ${CMAKE_CURRENT_SOURCE_DIR}/inc
+)
+

libs/lib2/inc/lib2.h

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+#pragma once
+
+void lib2_function(); // Function declaration for lib2

libs/lib2/src/lib2.c

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+#include "lib2.h"  // Include lib2's own header
+#include <stdio.h> // Include standard I/O here, as printf is used in this source file.
+
+void lib2_function()
+{
+  printf("This is a function from Library 2.\n");
+}