OK. Thank you for this answer, but my confusion is as follows:
I'm using Android 5.1, and on it I compile directly through the terminal commands.
Here is an example of my configuration for nginx:

./configure --prefix=/data/data/com.termux/files/usr/src/nginx
--with-cc=arm-linux-androideabi-clang
--with-cpp=arm-linux-androideabi-cpp
--with-ld-opt='-march=armv7-a -Wl,-z,relro,-z,now'
--with-cc-opt='-I/data/data/com.termux/files/usr/include -DIOV_MAX=1024 -march=armv7-a -mfpu=neon -mfloat-abi=softfp -mthumb -Oz -fstack-protector-strong'
--with-openssl=/data/data/com.termux/files/usr/src/openssl-1.1.1v
--with-zlib=/data/data/com.termux/files/usr/src/zlib-1.3
--with-pcre=/data/data/com.termux/files/usr/src/pcre2-10.42
--with-pcre-jit
--with-threads
--with-stream
--with-stream_ssl_module
--with-stream_realip_module
--with-stream_ssl_preread_module
--with-mail
--with-mail_ssl_module
--with-http_ssl_module
--with-http_v2_module
--with-http_realip_module
--with-http_addition_module
--with-http_sub_module
--with-http_dav_module
--with-http_flv_module
--with-http_mp4_module
--with-http_gunzip_module
--with-http_gzip_static_module
--with-http_auth_request_module
--with-http_random_index_module
--with-http_secure_link_module
--with-http_degradation_module
--with-http_slice_module
--with-http_stub_status_module

As you can see, everything is included for compilation in one program, this time the latest nginx. In the compilation I directly include: "glob.c", "crypt.c", as well as the latest openssl-1.1.1v, zlib-1.3 and pcre2-10.42 from the configuration. So I don't use Termux's libraries, like: "libandroid-glob.so" (I have glob.h and glob.c), "libcrypt.so" (I have crypt.h and crypt.c), "libssl.so.1.1" and "libcrypto.so.1.1" (I have openssl-1.1.1v source code) , "libz.so.1" (I have zlib-1.3 source code) and "libpcre.so" (I have pcre2-10.42 source code). So I only use Termux's compilers "arm-linux-androideabi-clang" and "arm-linux-androideabi-cpp" from "https://packages.termux.dev/termux-main-21/", and everything runs on a device running Android 5.1. Compiled ELF always starts with "WARNING: linker: unused DT entry...".
Could it be because these compilers are older than Android 5.1, or vice versa?

Thank you very much.

Why does the unused DT entry appear? #26

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