Here is the error:

C:\Programas\magnifierv3\libraries\c_overlays>dllwrap.exe --output-def c_overlay
s.def --driver-name c++ --implib c_overlays.a c_overlays.o -L"c:/Programas/dev-c
pp/lib;c:/Programas/DXSDK/Lib" --no-export-all-symbols --add-stdcall-alias -o c_
overlays.dll
dllwrap.exe: no export definition file provided.
Creating one, but that may not be what you want
c_overlays.o(.text+0x29):c_overlays.cpp: undefined reference to `DirectDrawCreat
eEx@16'
collect2: ld returned 1 exit status
dllwrap.exe: c++ exited with status 1

I installed DirectX SDK on C:\Programas\DXSDK
and dev-cpp on: C:\Programas\Dev-Cpp

Here is my build script:

PATH=C:\Programas\Dev-Cpp\bin
g++ -c c_overlays.cpp -IC:\Programas\DXSDK\Include
-IC:\Programas\Dev-Cpp\include -o c_overlays.o
dllwrap.exe --output-def c_overlays.def --driver-name c++ --implib
c_overlays.a c_overlays.o
-L"c:/Programas/dev-cpp/lib;c:/Programas/DXSDK/Lib"
--no-export-all-symbols --add-stdcall-alias -o c_overlays.dll