Why doesn't my binary find libwx_gtk3u_html-3.2.so.0?

Question

I'm trying to build FileZilla on Linux and have my binary run without needing the hack of having LD_LIBRARY_PATH set in the terminal. I've got the current directory structure:

FileZilla3
├── bin
│   ├── filezilla
│   ├── fzputtygen
│   ├── fzsftp
│   └── fzstorj
└── lib
    ├── libfilezilla.so.45
    ├── libfzclient-commonui-private-3.67.1.so
    ├── libfzclient-private-3.67.1.so
    ├── libgmp.so.10
    ├── libgnutls.so.30
    ├── libhogweed.so.6
    ├── libnettle.so.8
    ├── libsqlite3.so.0
    ├── libwx_baseu-3.2.so.0
    ├── libwx_baseu_xml-3.2.so.0
    ├── libwx_gtk3u_aui-3.2.so.0
    ├── libwx_gtk3u_core-3.2.so.0
    ├── libwx_gtk3u_html-3.2.so.0
    └── libwx_gtk3u_xrc-3.2.so.0

I've been putting the appropriate libraries into lib one by one, based on what's listed here:

$ eu-readelf -d filezilla

Dynamic segment contains 47 entries:
 Addr: 0x00000000004ed2d0  Offset: 0x4ec2d0  Link to section: [36] '.dynstr'
  Type              Value
  NEEDED            Shared library: [libfzclient-commonui-private-3.67.1.so]
  NEEDED            Shared library: [libfzclient-private-3.67.1.so]
  NEEDED            Shared library: [libfilezilla.so.45]
  NEEDED            Shared library: [libpugixml.so.1]
  NEEDED            Shared library: [libdbus-1.so.3]
  NEEDED            Shared library: [libwx_gtk3u_aui-3.2.so.0]
  NEEDED            Shared library: [libwx_gtk3u_xrc-3.2.so.0]
  NEEDED            Shared library: [libwx_gtk3u_core-3.2.so.0]
  NEEDED            Shared library: [libwx_baseu-3.2.so.0]
  NEEDED            Shared library: [libsqlite3.so.0]
  NEEDED            Shared library: [libgtk-3.so.0]
  NEEDED            Shared library: [libgdk-3.so.0]
  NEEDED            Shared library: [libstdc++.so.6]
  NEEDED            Shared library: [libm.so.6]
  NEEDED            Shared library: [libgcc_s.so.1]
  NEEDED            Shared library: [libc.so.6]
  RUNPATH           Library runpath: [$ORIGIN/../lib]

However, when I now try to run the binary I get the following:

$ ./bin/filezilla
./bin/filezilla: error while loading shared libraries: libwx_gtk3u_html-3.2.so.0: cannot open shared object file: No such file or directory

Why can't it find libwx_gtk3u_html-3.2.so.0? It's in the lib directory. And why does it even require that file when it's not apparently required in the ELF? Can it be pulled in by another SO file?

Answer 1

Turns out my libraries weren't looking for their required libraries in the same directory because they had no RUNPATH set. I had to set it to look in the origin directory like so, and then they loaded properly:

patchelf --set-rpath "\$ORIGIN" ./libwx_gtk3u_xrc-3.2.so.0