# Houdini Development Kit: compile geoisosurface.C

Hello, devs,

I have compiled geoisosurface.C, which is the very first step in HDK docs, but running geoisosurface.exe raise an error:

`Entry Point Not Found. The procedure entry point gzdirect could not be located in the dynamic link library C:\Program Files\Side Effects Software\Houdini 18.0.460\bin\libxml2.dll`

If I place geoisosurface.exe into the Houdini bin folder it is working and produce me sphere.bgeo.
If I copy libxml2.dll to the folder with exe file the error is:
`The procedure entry point gzdirect could not be located in the dynamic link library D:/path_to_geoisosurface/libxml2.dll`

I am pretty sure that exe file should work outside Houdini bin dir, but have no idea how to fix this.