# Cannot find library header files when cross compiling

**URL:** https://discourse.cmake.org/t/cannot-find-library-header-files-when-cross-compiling/5926
**Category:** Usage
**Tags:** os:linux
**Created:** [June 24, 2022, 3:03pm UTC](https://discourse.cmake.org/t/cannot-find-library-header-files-when-cross-compiling/5926 "2022-06-24T15:03:46Z")
**Posts on this page:** 4
**Page:** 1

<div class="post-metadata">

### Author: ![william](https://discourse.cmake.org/user_avatar/discourse.cmake.org/william/32/2535_2.png) [@william](https://discourse.cmake.org/u/william)
#### Post date: [June 24, 2022, 3:03pm UTC](https://discourse.cmake.org/t/cannot-find-library-header-files-when-cross-compiling/5926/1 "2022-06-24T15:03:46Z")

</div>

I’m cross compiling for arm on Arch Linux host, but the cross compiler cannot find any library headers.  
**CMakeLists.txt**

```auto
cmake_minimum_required(VERSION 3.13)
project(cross-compile-demo C)

find_package(LibArchive REQUIRED)

add_executable(demo main.c)
target_link_libraries(demo ${LibArchive_LIBRARIES})

```

**main.c**

```auto
#include <stdio.h>
#include <archive.h>

int main(int argc, char const *argv[])
{
	return 0;
}

```

**rpi4-toolchain.cmake**

```auto
set(CMAKE_SYSTEM_NAME Linux)

set(CMAKE_C_COMPILER aarch64-linux-gnu-gcc)

set(CMAKE_CXX_COMPILER aarch64-linux-gnu-g++)
set(CMAKE_FIND_ROOT_PATH /usr/aarch64-linux-gnu /tmp/rpi-root)

set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

```

**Output**

```auto
-- The C compiler identification is GNU 12.1.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/aarch64-linux-gnu-gcc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Found LibArchive: /tmp/rpi-root/usr/lib/libarchive.so (found version "3.6.1") 
-- Configuring done
-- Generating done
-- Build files have been written to: /home/william/Downloads/cross-compile/build
[1/2] Building C object CMakeFiles/demo.dir/main.c.o
FAILED: CMakeFiles/demo.dir/main.c.o 
/usr/bin/aarch64-linux-gnu-gcc -O3 -DNDEBUG -MD -MT CMakeFiles/demo.dir/main.c.o -MF CMakeFiles/demo.dir/main.c.o.d -o CMakeFiles/demo.dir/main.c.o -c /home/william/Downloads/cross-compile/main.c
/home/william/Downloads/cross-compile/main.c:2:10: fatal error: archive.h: No such file or directory
    2 | #include <archive.h>
      | ^ ~~~~~~~~~~
compilation terminated.
ninja: build stopped: subcommand failed.

```

What might be the issue?

---

<div class="post-metadata">

### Author: ![fenrir](https://discourse.cmake.org/user_avatar/discourse.cmake.org/fenrir/32/734_2.png) [@fenrir](https://discourse.cmake.org/u/fenrir)
#### Post date: [June 24, 2022, 3:17pm UTC](https://discourse.cmake.org/t/cannot-find-library-header-files-when-cross-compiling/5926/2 "2022-06-24T15:17:22Z")

</div>

TL;DR; use `target_link_libraries(demo PRIVATE LibArchive::LibArchive)`

Currently you’re linking using pure file paths, which do not carry any information about the include directories. While you could add `target_link_libraries(demo PRIVATE ${LibArchive_INCLUDE_DIRS})` in modern CMake you should use imported targets that carry all the needed properties with them.

---

<div class="post-metadata">

### Author: ![william](https://discourse.cmake.org/user_avatar/discourse.cmake.org/william/32/2535_2.png) [@william](https://discourse.cmake.org/u/william)
#### Post date: [June 24, 2022, 4:04pm UTC](https://discourse.cmake.org/t/cannot-find-library-header-files-when-cross-compiling/5926/3 "2022-06-24T16:04:29Z")

</div>

Thanks, the header files can be found now, however, it seems the ld program cannot find symbols now  
**log**

```auto
-- The C compiler identification is GNU 10.2.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/arm-linux-gnueabihf-gcc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Found LibArchive: /tmp/rpi-root/usr/lib/libarchive.so (found version "3.6.1") 
-- Configuring done
-- Generating done
-- Build files have been written to: /home/william/Downloads/cross-compile/build
[2/2] Linking C executable demo
FAILED: demo 
: && /usr/bin/arm-linux-gnueabihf-gcc -O3 -DNDEBUG CMakeFiles/demo.dir/main.c.o -o demo -Wl,-rpath,/tmp/rpi-root/usr/lib /tmp/rpi-root/usr/lib/libarchive.so && :
/usr/bin/arm-linux-gnueabihf-ld: warning: libcrypto.so.1.1, needed by /tmp/rpi-root/usr/lib/libarchive.so, not found (try using -rpath or -rpath-link)
/usr/bin/arm-linux-gnueabihf-ld: warning: libacl.so.1, needed by /tmp/rpi-root/usr/lib/libarchive.so, not found (try using -rpath or -rpath-link)
/usr/bin/arm-linux-gnueabihf-ld: warning: libexpat.so.1, needed by /tmp/rpi-root/usr/lib/libarchive.so, not found (try using -rpath or -rpath-link)
/usr/bin/arm-linux-gnueabihf-ld: warning: liblzma.so.5, needed by /tmp/rpi-root/usr/lib/libarchive.so, not found (try using -rpath or -rpath-link)
/usr/bin/arm-linux-gnueabihf-ld: warning: libzstd.so.1, needed by /tmp/rpi-root/usr/lib/libarchive.so, not found (try using -rpath or -rpath-link)
/usr/bin/arm-linux-gnueabihf-ld: warning: liblz4.so.1, needed by /tmp/rpi-root/usr/lib/libarchive.so, not found (try using -rpath or -rpath-link)
/usr/bin/arm-linux-gnueabihf-ld: warning: libbz2.so.1.0, needed by /tmp/rpi-root/usr/lib/libarchive.so, not found (try using -rpath or -rpath-link)
/usr/bin/arm-linux-gnueabihf-ld: warning: libz.so.1, needed by /tmp/rpi-root/usr/lib/libarchive.so, not found (try using -rpath or -rpath-link)
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `EVP_MD_CTX_free@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `LZ4_resetStreamHC'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `LZ4_compress_HC'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `ZSTD_compressStream'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `LZ4_freeStreamHC'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `lzma_alone_decoder@XZ_5.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `EVP_sha512@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `ZSTD_createDStream'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `EVP_sha256@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `lzma_raw_decoder@XZ_5.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `EVP_MD_CTX_new@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `EVP_aes_192_ecb@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `lzma_properties_encode@XZ_5.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `inflate'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `ZSTD_isError'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `ZSTD_minCLevel'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `XML_ParserCreate'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `lzma_stream_decoder@XZ_5.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `ZSTD_initCStream'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `ZSTD_CCtx_setParameter'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `BZ2_bzlibVersion'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `crc32'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `lstat64@GLIBC_2.33'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `HMAC_CTX_free@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `LZ4_saveDictHC'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `lzma_stream_encoder_mt@XZ_5.2'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `LZ4_saveDict'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `acl_get_permset@ACL_1.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `lzma_properties_size@XZ_5.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `LZ4_freeStream'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `ZSTD_versionNumber'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `BZ2_bzDecompressInit'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `deflateReset'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `lzma_raw_encoder@XZ_5.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `BZ2_bzDecompressEnd'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `deflate'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `XML_SetCharacterDataHandler'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `acl_get_fd@ACL_1.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `lzma_stream_encoder@XZ_5.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `acl_set_tag_type@ACL_1.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `XML_ParserFree'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `HMAC_Init_ex@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `XML_SetUserData'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `BZ2_bzCompressInit'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `acl_clear_perms@ACL_1.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `deflateInit2_'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `EVP_ripemd160@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `ZSTD_DStreamOutSize'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `ZSTD_freeCStream'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `XML_Parse'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `EVP_EncryptUpdate@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `EVP_sha384@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `BZ2_bzCompressEnd'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `fstatat64@GLIBC_2.33'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `deflateInit_'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `LZ4_compress_HC_continue'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `LZ4_decompress_safe_usingDict'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `lzma_crc32@XZ_5.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `ZSTD_getErrorName'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `acl_add_perm@ACL_1.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `inflateEnd'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `acl_set_file@ACL_1.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `HMAC_CTX_new@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `ZSTD_initDStream'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `BZ2_bzCompress'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `LZ4_loadDict'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `inflateSetDictionary'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `acl_get_entry@ACL_1.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `acl_get_perm@ACL_1.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `lzma_end@XZ_5.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `acl_free@ACL_1.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `acl_set_qualifier@ACL_1.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `lzma_code@XZ_5.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `lzma_memusage@XZ_5.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `ZSTD_CStreamOutSize'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `LZ4_compress_fast_continue'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `deflateEnd'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `lzma_cputhreads@XZ_5.2'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `LZ4_decompress_safe'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `EVP_CIPHER_CTX_free@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `BZ2_bzDecompress'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `fstat64@GLIBC_2.33'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `EVP_aes_128_ecb@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `acl_init@ACL_1.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `inflateInit_'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `acl_set_fd@ACL_1.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `ZSTD_decompressStream'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `lzma_properties_decode@XZ_5.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `EVP_sha1@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `lzma_lzma_preset@XZ_5.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `acl_get_file@ACL_1.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `XML_SetElementHandler'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `inflateInit2_'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `LZ4_createStreamHC'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `EVP_DigestInit@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `EVP_DigestUpdate@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `lzma_alone_encoder@XZ_5.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `ZSTD_endStream'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `inflateReset'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `EVP_md5@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `HMAC_Final@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `stat64@GLIBC_2.33'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `LZ4_createStream'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `LZ4_loadDictHC'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `PKCS5_PBKDF2_HMAC_SHA1@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `EVP_EncryptInit_ex@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `HMAC_Update@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `EVP_aes_256_ecb@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `acl_get_tag_type@ACL_1.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `acl_get_qualifier@ACL_1.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `ZSTD_createCStream'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `LZ4_compress_default'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `ZSTD_freeDStream'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `acl_create_entry@ACL_1.0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `EVP_CIPHER_CTX_new@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `mknod@GLIBC_2.33'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `EVP_DigestFinal@OPENSSL_1_1_0'
/usr/bin/arm-linux-gnueabihf-ld: /tmp/rpi-root/usr/lib/libarchive.so: undefined reference to `ZSTD_maxCLevel'
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.

```

---

<div class="post-metadata">

### Author: ![ben.boeckel](https://discourse.cmake.org/letter_avatar_proxy/v4/letter/b/ea5d25/32.png) [@ben.boeckel](https://discourse.cmake.org/u/ben.boeckel)
#### Post date: [June 27, 2022, 5:58pm UTC](https://discourse.cmake.org/t/cannot-find-library-header-files-when-cross-compiling/5926/4 "2022-06-27T17:58:42Z")

</div>

Your toolchain file may need to add `-rpath-link` flags to help the linker find the libraries it needs.