I installed each dev pak and tried the initial demo that is available when starting a new wxWidgets project. I compiled it and this is what I got in my Compile Log:
Compiler: Default compiler Building Makefile: "C:\Documents and Settings\JAMIE BERNIER\Desktop\Makefile.win" Executing make... make.exe -f "C:\Documents and Settings\JAMIE BERNIER\Desktop\Makefile.win" all g++.exe -c main.cpp -o main.o -I"C:/Dev-Cpp/include/c++" -I"C:/Dev-Cpp/include/c++/mingw32" -I"C:/Dev-Cpp/include/c++/backward" -I"C:/Dev-Cpp/include" -DWINVER=0x0400 -D__WIN95__ -D__GNUWIN32__ -D__WIN32__ -DHAVE_W32API_H -D__WXMSW__ -D__WINDOWS__ -Wall -fno-pcc-struct-return -O2 -Os -fno-rtti -fno-exceptions
C:/Dev-Cpp/lib/libwxmsw.a(frame.o)(.rdata$_ZTV7wxFrame+0x0):frame.cpp: multiple definition of `vtable for wxFrame' main.o(.data$_ZTV7wxFrame+0x0):main.cpp: first defined here C:/Dev-Cpp/lib/libwxmsw.a(object.o)(.rdata$_ZTV15wxObjectRefData+0x0):object.cpp: multiple definition of `vtable for wxObjectRefData' main.o(.data$_ZTV15wxObjectRefData+0x0):main.cpp: first defined here C:/Dev-Cpp/lib/libwxmsw.a(menu.o)(.rdata$_ZTV14wxMenuItemList+0x0):menu.cpp: multiple definition of `vtable for wxMenuItemList' main.o(.data$_ZTV14wxMenuItemList+0x0):main.cpp: first defined here C:/Dev-Cpp/lib/libwxmsw.a(menu.o)(.rdata$_ZTV6wxMenu+0x0):menu.cpp: multiple definition of `vtable for wxMenu' main.o(.data$_ZTV6wxMenu+0x0):main.cpp: first defined here
C:/Dev-Cpp/lib/libwxmsw.a(icon.o)(.rdata$_ZTV6wxIcon+0x0):icon.cpp: multiple definition of `vtable for wxIcon'
main.o(.data$_ZTV6wxIcon+0x0):main.cpp: first defined here C:/Dev-Cpp/lib/libwxmsw.a(icon.o)(.rdata$_ZTV13wxIconRefData+0x0):icon.cpp: multiple definition of `vtable for wxIconRefData' main.o(.data$_ZTV13wxIconRefData+0x0):main.cpp: first defined here C:/Dev-Cpp/lib/libwxmsw.a(menucmn.o)(.rdata$_ZTV10wxMenuBase+0x0):menucmn.cpp: multiple definition of `vtable for wxMenuBase' main.o(.data$_ZTV10wxMenuBase+0x0):main.cpp: first defined here C:/Dev-Cpp/lib/libwxmsw.a(menucmn.o)(.rdata$_ZTV20wxwxMenuItemListNode+0x0):menucmn.cpp: multiple definition of `vtable for wxwxMenuItemListNode' main.o(.data$_ZTV20wxwxMenuItemListNode+0x0):main.cpp: first defined here C:/Dev-Cpp/lib/libwxmsw.a(list.o)(.rdata$_ZTV10wxListBase+0x0):list.cpp: multiple definition of `vtable for wxListBase' main.o(.data$_ZTV10wxListBase+0x0):main.cpp: first defined here