Building a client for an old Centos distribution

[Catwoolfii]

I used scripts from this repository and built a client v1.0.11 in a Centos 6 environment with the glibc 2.12 library.
The resulting client is successfully installed on the Centos 6.10 system, but when trying to perform a backup, the following error occurs:

awk ELOOP: Too many symbolic links encountered (find -L / -xtype l)

The error occurs when there are indeed many symbolic links in the directory (for example, /etc).
Can anyone suggest: why does this error occur with symlinks?

Here is a list of used libraries and client dependencies:

$ ldd /usr/local/sbin/proxmox-backup-client
linux-vdso.so.1 => (0x00007fff39317000)
libacl.so.1 => /lib64/libacl.so.1 (0x00007f29f906e000)
libsgutils2.so.2 => /usr/lib64/libsgutils2.so.2 (0x00007f29f8e46000)
libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007f29f8c0e000)
libpam.so.0 => /lib64/libpam.so.0 (0x00007f29f8a00000)
libudev.so.0 => /lib64/libudev.so.0 (0x00007f29f87f2000)
libfuse3.so.3 => /usr/lib64/libfuse3.so.3 (0x00007f29f85b2000)
librt.so.1 => /lib64/librt.so.1 (0x00007f29f83aa000)
libc.so.6 => /lib64/libc.so.6 (0x00007f29f8016000)
/lib64/ld-linux-x86-64.so.2 (0x000055bf06df5000)
libuuid.so.1 => /lib64/libuuid.so.1 (0x00007f29f7e11000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f29f7bfb000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f29f79de000)
libm.so.6 => /lib64/libm.so.6 (0x00007f29f7759000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f29f7555000)
libattr.so.1 => /lib64/libattr.so.1 (0x00007f29f7350000)
libfreebl3.so => /lib64/libfreebl3.so (0x00007f29f714c000)
libaudit.so.1 => /lib64/libaudit.so.1 (0x00007f29f6f28000)

$ rpm -qR proxmox-backup-1.0.11-1
rpmlib(VersionedDependencies) <= 3.0.3-1
ld-linux-x86-64.so.2()(64bit)
ld-linux-x86-64.so.2(GLIBC_2.3)(64bit)
libacl.so.1()(64bit)
libcrypt.so.1()(64bit)
libcrypt.so.1(GLIBC_2.2.5)(64bit)
libc.so.6()(64bit)
libc.so.6(GLIBC_2.10)(64bit)
libc.so.6(GLIBC_2.2.5)(64bit)
libc.so.6(GLIBC_2.3.2)(64bit)
libc.so.6(GLIBC_2.3.4)(64bit)
libc.so.6(GLIBC_2.3)(64bit)
libc.so.6(GLIBC_2.4)(64bit)
libc.so.6(GLIBC_2.5)(64bit)
libc.so.6(GLIBC_2.6)(64bit)
libc.so.6(GLIBC_2.7)(64bit)
libc.so.6(GLIBC_2.8)(64bit)
libc.so.6(GLIBC_2.9)(64bit)
libdl.so.2()(64bit)
libdl.so.2(GLIBC_2.2.5)(64bit)
libfuse3.so.3()(64bit)
libgcc_s.so.1()(64bit)
libgcc_s.so.1(GCC_3.0)(64bit)
libgcc_s.so.1(GCC_3.3)(64bit)
libgcc_s.so.1(GCC_4.2.0)(64bit)
libm.so.6()(64bit)
libm.so.6(GLIBC_2.2.5)(64bit)
libpam.so.0()(64bit)
libpthread.so.0()(64bit)
libpthread.so.0(GLIBC_2.2.5)(64bit)
libpthread.so.0(GLIBC_2.3.3)(64bit)
librt.so.1()(64bit)
librt.so.1(GLIBC_2.2.5)(64bit)
librt.so.1(GLIBC_2.3.3)(64bit)
librt.so.1(GLIBC_2.3.4)(64bit)
librt.so.1(GLIBC_2.4)(64bit)
libsgutils2.so.2()(64bit)
libssl.so.10()(64bit)
libudev.so.0()(64bit)
libuuid.so.1()(64bit)
libzstd.so.1()(64bit)
/bin/sh
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(PayloadIsXz) <= 5.2-1

Package is available at this link:
https://cloud.mail.ru/public/QDCQ/sNXPvtaAN