There is the problem: For whatever reason, the nsd you are using is linked against /usr/local/aolserver/lib/
libnsd.so => /usr/local/aolserver/lib/libnsd.so (0x00007ff16d735000)
libnsthread.so => /usr/local/aolserver/lib/libnsthread.so (0x00007ff16d0db000)
A correct output looks like:
gentoo # ldd /usr/local/ns/bin/nsd
linux-vdso.so.1 (0x00007ffdb4f49000)
libnsd.so => /usr/local/ns/lib/libnsd.so (0x00007fda05726000)
libz.so.1 => /lib64/libz.so.1 (0x00007fda0550f000)
libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007fda052d7000)
libnsthread.so => /usr/local/ns/lib/libnsthread.so (0x00007fda050ce000)
libtcl8.6.so => /usr/local/ns/lib/libtcl8.6.so (0x00007fda04d15000)
libgcc_s.so.1 => /usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/libgcc_s.so.1 (0x00007fda04afe000)
libm.so.6 => /lib64/libm.so.6 (0x00007fda047ac000)
libssl.so.1.0.0 => /usr/lib64/libssl.so.1.0.0 (0x00007fda0453f000)
libcrypto.so.1.0.0 => /usr/lib64/libcrypto.so.1.0.0 (0x00007fda0410c000)
libc.so.6 => /lib64/libc.so.6 (0x00007fda03d4a000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007fda03b46000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fda03926000)
/lib64/ld-linux-x86-64.so.2 (0x00007fda05bf4000)
