I tried to build a source file with following command:
g++ main.cpp `wx-config --cxxflags --libs std`
/usr/bin/ld: cannot find -lgthread-2.0
/usr/bin/ld: cannot find -lX11
/usr/bin/ld: cannot find -lXxf86vm
/usr/bin/ld: cannot find -lSM
/usr/bin/ld: cannot find -lgtk-3
/usr/bin/ld: cannot find -lgdk-3
/usr/bin/ld: cannot find -latk-1.0
/usr/bin/ld: cannot find -lgio-2.0
/usr/bin/ld: cannot find -lpangocairo-1.0
/usr/bin/ld: cannot find -lgdk_pixbuf-2.0
/usr/bin/ld: cannot find -lcairo-gobject
/usr/bin/ld: cannot find -lpango-1.0
/usr/bin/ld: cannot find -lcairo
/usr/bin/ld: cannot find -lgobject-2.0
/usr/bin/ld: cannot find -lglib-2.0
/usr/bin/ld: cannot find -lpng
/usr/bin/ld: cannot find -lexpat
/usr/bin/ld: cannot find -lz
collect2: error: ld returned 1 exit status
I guess I didn't install wxWidgets correctly (I installed libwxgtk3.0-dev as described in multiple install tutorials)
EDIT
wx-config --libs std
-L/usr/local/lib -pthread /usr/local/lib/libwx_gtk3u_xrc-3.1.a /usr/local/lib/libwx_gtk3u_qa-3.1.a /usr/local/lib/libwx_baseu_net-3.1.a /usr/local/lib/libwx_gtk3u_html-3.1.a /usr/local/lib/libwx_gtk3u_adv-3.1.a /usr/local/lib/libwx_gtk3u_core-3.1.a /usr/local/lib/libwx_baseu_xml-3.1.a /usr/local/lib/libwx_baseu-3.1.a -pthread -lgthread-2.0 -lX11 -lXxf86vm -lSM -lgtk-3 -lgdk-3 -latk-1.0 -lgio-2.0 -lpangocairo-1.0 -lgdk_pixbuf-2.0 -lcairo-gobject -lpango-1.0 -lcairo -lgobject-2.0 -lglib-2.0 -lpng -lexpat -lwxregexu-3.1 -lwxtiff-3.1 -lwxjpeg-3.1 -lz -ldl -lm
If you use Ubuntu, you really shouldn't have any problems if you just installed the distribution package.
It looks like you had tried to install wxWidgets from sources before and your wx-config comes from /usr/local/bin and is not the one installed by the package. You can check it using which wx-config and/or using full path to /usr/bin/wx-config when compiling. Just get rid of this one, and all the other traces of wxWidgets under /usr/local, if you're using the system packages.