Class based on wxObject fails to link

First, this is being built on Linux.

We have an API that is based on wxObjects (we do not use the GUI objects). Our classes are defined as follows:

#include <wx/wx.h>

class apibaseclass : public wxObject
{
    apibaseclass();
    ~apibaseclass();
}

About five years ago this compiled and linked just fine. 开发者_如何学GoI've been asked to make changes and now I get the following error:

undefined reference to wxObject::wxObject()'/home/lloyd/Projects/wxtestprogram/main.cpp:7: undefined reference towxObject::wxObject()'

This is the program I was using as a sanity test:

#include <iostream>
#include <wx/wx.h>

class blah : public wxObject
{
public:
int x;

blah();
virtual ~blah();

void setvalue(int value);
int getvalue();
};

blah::blah()
{
}


blah::~blah()
{
}

void blah::setvalue(int value)
{
    x = value;
}

int blah::getvalue()
{
    return x;
}


using namespace std;

int main()
{
    class blah *testvalue = new blah();

    testvalue->setvalue(15);

    wxPrintf(wxT("Hello World 2 %d\r\n"), testvalue->getvalue());

    wxString str1 = wxT("Linux");

    wxString str2 = wxT("Operating");

    wxString str3 = wxT("System");

    wxString str;
    str = str1 + wxT(" ") + str2 + wxT(" ") + str3;

    wxPuts(str);
    wxPrintf(wxGetHomeDir());


    long int mem = wxGetFreeMemory();

    wxPrintf(wxT("Memory: %ld\n"), mem);
    return 0;
}

What is bothersome is that if I replace "public wxObject" with "public wxString" then it links just fine. Why am I unable to access wxObject?!?

NOTE: I've never linked against anything other than libwx_baseu-2.6.so in the past. And in fact when I build without the GUI it only builds libwx_baseu-2.6, libwx_baseu_net-2.6 and libwx_baseu_xml-2.6.

What do I need to do to get things building and LINKING again with minimal muss and fuss?

Using

wx-config --cxxflags --libs base 

gave me the missing items that allowed me to build the project correctly. No doubt this is what I used five years ago.