Error compiling openexr

Hi,

I'm trying to complie Fractorium but I'm encountering multiple issues with the provided cmd scripts. I was able to "fix" most of them by compiling them by hand using different tricks, but I have no clue how to compile successfully OpenEXR.

My system: Windows 10 Pro N version 1803 Visual Studio Community 2017 version 15.8.1 CMake version 3.12.1 (please ask for additional information if needed)

Please, note that I have little to zero background working with Visual Studio, CMake or most of the tools used for this project. I've worked mostly with Java and little of C at university. But I really love Fractorium and want to try some stuff with it!

Here's the output after executing openexer.cmd from "Developer Command Prompt for VS 2017":

G:\Users\David\Documents\code\fractorium\fractorium>openexr.cmd

G:\Users\David\Documents\code\fractorium\fractorium>ECHO building OpenEXR
building OpenEXR

G:\Users\David\Documents\code\fractorium\fractorium>cd..

G:\Users\David\Documents\code\fractorium>if not exist ".\openexr"       mkdir openexr
"       mkdir" no se reconoce como un comando interno o externo,
programa o archivo por lotes ejecutable.

G:\Users\David\Documents\code\fractorium>git clone git://github.com/meshula/openexr.git
Cloning into 'openexr'...
remote: Counting objects: 13897, done.
remote: Total 13897 (delta 0), reused 0 (delta 0), pack-reused 13897
Receiving objects: 100% (13897/13897), 46.43 MiB | 11.94 MiB/s, done.
Resolving deltas: 100% (9870/9870), done.

G:\Users\David\Documents\code\fractorium>cd openexr

G:\Users\David\Documents\code\fractorium\openexr>git pull
Already up-to-date.

G:\Users\David\Documents\code\fractorium\openexr>SET current=G:\Users\David\Documents\code\fractorium\openexr

G:\Users\David\Documents\code\fractorium\openexr>if not exist ".\output" mkdir .\output

G:\Users\David\Documents\code\fractorium\openexr>cd IlmBase

G:\Users\David\Documents\code\fractorium\openexr\IlmBase>cmake -G "Visual Studio 15 2017 Win64"      -DCMAKE_PREFIX_PATH="G:\Users\David\Documents\code\fractorium\openexr\output"      -DCMAKE_INSTALL_PREFIX="G:\Users\David\Documents\code\fractorium\openexr\output"      .\
-- The C compiler identification is MSVC 19.15.26726.0
-- The CXX compiler identification is MSVC 19.15.26726.0
-- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.15.26726/bin/Hostx86/x64/cl.exe
-- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.15.26726/bin/Hostx86/x64/cl.exe -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.15.26726/bin/Hostx86/x64/cl.exe
-- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.15.26726/bin/Hostx86/x64/cl.exe -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Error at Half/CMakeLists.txt:97 (add_library):
  add_library cannot create ALIAS target "IlmBase::Half" because target
  "Half_static" does not already exist.


CMake Error at Iex/CMakeLists.txt:68 (add_library):
  add_library cannot create ALIAS target "IlmBase::Iex" because target
  "Iex_static" does not already exist.


CMake Error at IexMath/CMakeLists.txt:64 (add_library):
  add_library cannot create ALIAS target "IlmBase::IexMath" because target
  "IexMath_static" does not already exist.


CMake Error at Imath/CMakeLists.txt:97 (add_library):
  add_library cannot create ALIAS target "IlmBase::Imath" because target
  "Imath_static" does not already exist.


CMake Error at IlmThread/CMakeLists.txt:81 (add_library):
  add_library cannot create ALIAS target "IlmBase::IlmThread" because target
  "IlmThread_static" does not already exist.


-- Configuring incomplete, errors occurred!
See also "G:/Users/David/Documents/code/fractorium/openexr/IlmBase/CMakeFiles/CMakeOutput.log".

Attached CMakeOutput.log if needed (my system is in spanish, so some messages are in spanish, sorry for any inconvenience)

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