[root@ML-01 bin]# ldconfig -p | grep libpng

libpng15.so.15 (libc6,x86-64) => /lib64/libpng15.so.15

libpng15.so (libc6,x86-64) => /lib64/libpng15.so

libpng12.so.0 (libc6) => /lib/libpng12.so.0

libpng.so.3 (libc6) => /lib/libpng.so.3

[root@ML-01 bin]# ldd ./wkhtmltopdf 

./wkhtmltopdf: /lib64/libstdc++.so.6: version `CXXABI_1.3.8' not found (required by ./wkhtmltopdf)

./wkhtmltopdf: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by ./wkhtmltopdf)

./wkhtmltopdf: /lib64/libstdc++.so.6: version `CXXABI_1.3.9' not found (required by ./wkhtmltopdf)

./wkhtmltopdf: /lib64/libm.so.6: version `GLIBC_2.27' not found (required by ./wkhtmltopdf)

./wkhtmltopdf: /lib64/libc.so.6: version `GLIBC_2.28' not found (required by ./wkhtmltopdf)

linux-vdso.so.1 =>  (0x00007ffd0f5b6000)

libjpeg.so.62 => /lib64/libjpeg.so.62 (0x00007f0a47d2e000)

libpng16.so.16 => not found

libXrender.so.1 => /lib64/libXrender.so.1 (0x00007f0a47b23000)

libfontconfig.so.1 => /lib64/libfontconfig.so.1 (0x00007f0a478e1000)

libfreetype.so.6 => /lib64/libfreetype.so.6 (0x00007f0a47622000)

libXext.so.6 => /lib64/libXext.so.6 (0x00007f0a47410000)

libX11.so.6 => /lib64/libX11.so.6 (0x00007f0a470d2000)

libssl.so.1.1 => /lib64/libssl.so.1.1 (0x00007f0a46e42000)

libcrypto.so.1.1 => /lib64/libcrypto.so.1.1 (0x00007f0a4695f000)

libz.so.1 => /lib64/libz.so.1 (0x00007f0a46749000)

libdl.so.2 => /lib64/libdl.so.2 (0x00007f0a46545000)

librt.so.1 => /lib64/librt.so.1 (0x00007f0a4633d000)

libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f0a46121000)

libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007f0a45e1a000)

libm.so.6 => /lib64/libm.so.6 (0x00007f0a45b18000)

libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f0a45902000)

libc.so.6 => /lib64/libc.so.6 (0x00007f0a45535000)

/lib64/ld-linux-x86-64.so.2 (0x00007f0a47f83000)

libexpat.so.1 => /lib64/libexpat.so.1 (0x00007f0a4530b000)

libuuid.so.1 => /lib64/libuuid.so.1 (0x00007f0a45106000)

libbz2.so.1 => /lib64/libbz2.so.1 (0x00007f0a44ef6000)

libpng15.so.15 => /lib64/libpng15.so.15 (0x00007f0a44ccb000)

libxcb.so.1 => /lib64/libxcb.so.1 (0x00007f0a44aa3000)

휴.... 에러가 안없어지넹... ㅠ.ㅠ.