libappindicator3 library not found!

[stephengeorgewest]

error: failed to run custom build command for `libappindicator-sys v0.5.0 (/home/stephen/Documents/libappindicator-sys)`

Caused by:
  process didn't exit successfully: `/home/stephen/Documents/libappindicator-sys/target/debug/build/libappindicator-sys-27ebdcf284c18b94/build-script-build` (exit status: 101)
  --- stdout
  cargo:rustc-link-lib=appindicator3
  cargo:rerun-if-env-changed=APPINDICATOR3_NO_PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG
  cargo:rerun-if-env-changed=APPINDICATOR3_STATIC
  cargo:rerun-if-env-changed=APPINDICATOR3_DYNAMIC
  cargo:rerun-if-env-changed=PKG_CONFIG_ALL_STATIC
  cargo:rerun-if-env-changed=PKG_CONFIG_ALL_DYNAMIC
  cargo:rerun-if-env-changed=PKG_CONFIG_PATH_i686-unknown-linux-gnu
  cargo:rerun-if-env-changed=PKG_CONFIG_PATH_i686_unknown_linux_gnu
  cargo:rerun-if-env-changed=HOST_PKG_CONFIG_PATH
  cargo:rerun-if-env-changed=PKG_CONFIG_PATH
  cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR_i686-unknown-linux-gnu
  cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR_i686_unknown_linux_gnu
  cargo:rerun-if-env-changed=HOST_PKG_CONFIG_LIBDIR
  cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_i686-unknown-linux-gnu
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_i686_unknown_linux_gnu
  cargo:rerun-if-env-changed=HOST_PKG_CONFIG_SYSROOT_DIR
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR
  cargo:rerun-if-env-changed=APPINDICATOR3_1_NO_PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG
  cargo:rerun-if-env-changed=APPINDICATOR3_1_STATIC
  cargo:rerun-if-env-changed=APPINDICATOR3_1_DYNAMIC
  cargo:rerun-if-env-changed=PKG_CONFIG_ALL_STATIC
  cargo:rerun-if-env-changed=PKG_CONFIG_ALL_DYNAMIC
  cargo:rerun-if-env-changed=PKG_CONFIG_PATH_i686-unknown-linux-gnu
  cargo:rerun-if-env-changed=PKG_CONFIG_PATH_i686_unknown_linux_gnu
  cargo:rerun-if-env-changed=HOST_PKG_CONFIG_PATH
  cargo:rerun-if-env-changed=PKG_CONFIG_PATH
  cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR_i686-unknown-linux-gnu
  cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR_i686_unknown_linux_gnu
  cargo:rerun-if-env-changed=HOST_PKG_CONFIG_LIBDIR
  cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_i686-unknown-linux-gnu
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_i686_unknown_linux_gnu
  cargo:rerun-if-env-changed=HOST_PKG_CONFIG_SYSROOT_DIR
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR

  --- stderr
  thread 'main' panicked at 'libappindicator3 library not found!', build.rs:35:23
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

stephen@AO751h:~/Documents/libappindicator-sys$ apt search libappindicator3
p   libappindicator3-0.1-cil                          - CLI binding for appindicator3 using GObject introspection   
p   libappindicator3-0.1-cil-dev                      - CLI binding for libappindicator3 using GObject introspectioni   libappindicator3-1                                - Application Indicators
i   libappindicator3-dev                              - Application Indicators

stephen@AO751h:~/Documents/libappindicator-sys$ pkg-config --libs appindicator3-0.1
Package xapp was not found in the pkg-config search path.
Perhaps you should add the directory containing `xapp.pc'
to the PKG_CONFIG_PATH environment variable
Package 'xapp', required by 'appindicator3-0.1', not found

stephen@AO751h:~/Documents/libappindicator-sys$ sudo apt instal libxapp-dev
...

stephen@AO751h:~/Documents/libappindicator-sys$ pkg-config --libs appindicator3-0.1
-lappindicator3 -ldbusmenu-glib -lxapp -lgtk-3 -lgdk-3 -lpangocairo-1.0 -lpango-1.0 -latk-1.0 -lcairo-gobject -lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lgobject-2.0 -lglib-2.0

Still fails with the same error. Updating the packages as listed in the pull requests, brings up a libclang error.

I tried installing libclang, setting the export LLVM_CONFIG_PATH=/usr/bin/llvm-config-6.0 and the export LIBCLANG_PATH=/usr/lib/llvm-6.0/lib/libclang.so.1
none of it worked. I tried restarting and it still didn't work. Then I went back to my project that uses this one, and it worked?

stephen@AO751h:~/Documents/usbshare/Rust$ cargo build
   Compiling usbshare v0.1.1 (/home/stephen/Documents/usbshare/Rust)
   Compiling libappindicator-sys v0.5.0
   Compiling libappindicator v0.5.2
   Compiling tray-item v0.5.0-alpha
    Finished dev [unoptimized + debuginfo] target(s) in 3m 23s

I'm not sure which part fixed it for that project. I'm guessing maybe the restart? or the clang install. I geuss I will just leave this note here.