# Nested header file can not be found

**URL:** https://discourse.cmake.org/t/nested-header-file-can-not-be-found/7375
**Category:** Code
**Tags:** gen:makefiles
**Created:** [February 1, 2023, 12:56pm UTC](https://discourse.cmake.org/t/nested-header-file-can-not-be-found/7375 "2023-02-01T12:56:51Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![BenEngbers](https://discourse.cmake.org/letter_avatar_proxy/v4/letter/b/59ef9b/32.png) [@BenEngbers](https://discourse.cmake.org/u/BenEngbers)
#### Post date: [February 1, 2023, 12:56pm UTC](https://discourse.cmake.org/t/nested-header-file-can-not-be-found/7375/1 "2023-02-01T12:56:52Z")

</div>

Hi,  
This is the first project in which I use cmAKE AND c++.  
In Eclipse CDT I have created a project which uses 2 shared objects, libBasexCpp and libBasexSocket:

```auto
root |-- libBasexTest - libBasexTest.cpp
     |-- libBasexCpp 
     |-- libBasexSocket |-- BasexSocket.cpp
                        |-- BasexSocket.h
                        |-- StringUtils.cpp
                        |-- StringUtils.h

```

BasexSocket.cpp uses a function that is defined in StringUtils.h.  
Basexsocket.h begins with:

```auto
#pragma once

#ifndef BASEXSOCKET_H_
#define BASEXSOCKET_H_
   #include "StringUtils.h"
...
#endif

```

When building libBasexSocket, there are no errors and the .so-files are created.  
But when building libBasexTest, I receive this error:

```auto
[57%] Built target libBasexSocket
In file included from <root>/C_CPP_Werkbank/libBasexCpp/src/BasexClient.h:13,
                 from <root>/C_CPP_Werkbank/libBasexCpp/src/BasexClient.cpp:8:
<root>/C_CPP_Werkbank/libBasexCpp/src/BasexSocket.h:45:10: fatale fout: StringUtils.h: Bestand of map bestaat niet
   45 | #include "StringUtils.h"
      | ^ ~~~~~~~~~~~~~~

```

This the CMakeLists.txt from the main project:

```auto
cmake_minimum_required (VERSION 3.25.1)

project (libBasexTest VERSION 1.0)

set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

file (GLOB_RECURSE SOURCES src/*.cpp)
add_executable(libBasexTest ${SOURCES})

target_include_directories(libBasexTest PUBLIC
	"${PROJECT_BINARY_DIR}"
	)

target_link_libraries(${PROJECT_NAME} PUBLIC libBasexCpp libBasexSocket) subproject/libBasexSocket")

add_subdirectory("<root>/C_CPP_Werkbank/libBasexCpp" subproject/libBasexCpp)
add_subdirectory("<root>/C_CPP_Werkbank/libBasexSocket" subproject/libBasexSocket)

add_library(BasexCpp SHARED IMPORTED)						
add_library(BasexSocket SHARED IMPORTED)						

target_include_directories(${PROJECT_NAME} PUBLIC ${PROJECT_BINARY_DIR}/../libBasexCpp/src)
target_include_directories(${PROJECT_NAME} PUBLIC ${PROJECT_BINARY_DIR}/../libBasexSocket/src)

```

Is this an error in my C++ -code or did I make an error in CMakeListst.txt