libgsl-0.dll is missing

[belat]

Hi all, i am using certain optimization functions of the GNU Scientific Library (GSL) 1.15, 64-bit Windows and i currently have an issue with some missing dll apparently.
I am using Dev c++ and the code is compiling without error. the issue arises when i execute. I get a system error: "The program can't start because libgsl-0.dll is missing from your computer. try reinstalling the program to fix the problem."

I downloaded the library from here: https://code.google.com/p/oscats/downloads/detail?name=gsl-1.15-dev-win64.zip&can=2&q=

I noticed in the lib file the .dll.a and .a files have a different name from their corresponding .def files. i tried changing the names but that wasn't the answer.
Does anyone know what the issue is ?
Many thanks

[kbw]

Does it exist on your computer at all? Have you done a search?

[belat]

It does exist, i can see a file with the same name in the binaries folder:C:\Program Files (x86)\Dev-Cpp\GSL\bin\libgsl-0.dll
I included the path to the binaries folder in the compiler options on Dev c++, but it still gives the same error message.
any ideas?

Thanks