Building devilutionx as beginner - cmake doesn't find libsodium

Hello,

I’m trying to add devilutionx (reverse-engineered Diablo game) to my nixpgks : https://github.com/diasurgical/devilutionX

So far I’ve come up with this derivation:

{ stdenv, fetchgit, cmake, gcc, SDL2, SDL2_mixer, SDL2_ttf, libsodium}:
stdenv.mkDerivation rec {
  name = "devilutionx-${version}-${rev}";
  version = "0.4.0";
  rev = "1f20338";
  src = fetchgit {
    url = "https://github.com/diasurgical/devilutionX.git";
    inherit rev;
    sha256 = "12lkx4jqj1vinp9plka3xx4hxxbrszhjpvgv0m4x44p0vqzqrdir";
  };

  nativeBuildInputs = [ cmake gcc ];
  buildInputs = [ SDL2 SDL2_mixer SDL2_ttf libsodium sodium];

  meta = with stdenv.lib; {
    homepage = http://mars-game.sourceforge.net/;
    description = "DIABLO";
    license = licenses.gpl3Plus;
    maintainers = [ maintainers.astsmtl ];
    platforms = platforms.linux;
  };
}

Unfortunately when running nix-build -A devilutionx, I get this error message:

these derivations will be built:
  /nix/store/cxzwhklc3dhg1lzg9dd01kk65xi39vbn-devilutionx-0.4.0-1f20338.drv
building '/nix/store/cxzwhklc3dhg1lzg9dd01kk65xi39vbn-devilutionx-0.4.0-1f20338.drv'...
unpacking sources
unpacking source archive /nix/store/frnvjjks0p54giqlf7j3pkadd3z11gy5-devilutionX-1f20338
source root is devilutionX-1f20338
patching sources
configuring
fixing cmake files...
cmake flags: -DCMAKE_FIND_PACKAGE_NO_SYSTEM_PACKAGE_REGISTRY=ON -DCMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY=ON -DCMAKE_EXPORT_NO_PACKAGE_REGISTRY=ON -DCMAKE_BUILD_TYPE=Release -DCMAKE_SKIP_BUILD_RPATH=ON -DBUILD_TESTING=OFF -DCMAKE_INSTALL_INCLUDEDIR=/nix/store/mcg265d3x6kzbb01k8cpcpa5697ih9g0-devilutionx-0.4.0-1f20338/include -DCMAKE_INSTALL_LIBDIR=/nix/store/mcg265d3x6kzbb01k8cpcpa5697ih9g0-devilutionx-0.4.0-1f20338/lib -DCMAKE_INSTALL_NAME_DIR=/nix/store/mcg265d3x6kzbb01k8cpcpa5697ih9g0-devilutionx-0.4.0-1f20338/lib -DCMAKE_POLICY_DEFAULT_CMP0025=NEW -DCMAKE_OSX_DEPLOYMENT_TARGET= -DCMAKE_OSX_SYSROOT= -DCMAKE_FIND_FRAMEWORK=last -DCMAKE_STRIP=/nix/store/zizh5qzhcn4wzm06z99297ckalwrrpfk-binutils-2.31.1/bin/strip -DCMAKE_RANLIB=/nix/store/zizh5qzhcn4wzm06z99297ckalwrrpfk-binutils-2.31.1/bin/ranlib -DCMAKE_AR=/nix/store/zizh5qzhcn4wzm06z99297ckalwrrpfk-binutils-2.31.1/bin/ar -DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++ -DCMAKE_INSTALL_PREFIX=/nix/store/mcg265d3x6kzbb01k8cpcpa5697ih9g0-devilutionx-0.4.0-1f20338
-- The C compiler identification is GNU 7.4.0
-- The CXX compiler identification is GNU 7.4.0
-- Check for working C compiler: /nix/store/7nvy9l5jcp1c6z6n96l1a5x1bwbvamqn-gcc-wrapper-7.4.0/bin/gcc
-- Check for working C compiler: /nix/store/7nvy9l5jcp1c6z6n96l1a5x1bwbvamqn-gcc-wrapper-7.4.0/bin/gcc -- 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: /nix/store/7nvy9l5jcp1c6z6n96l1a5x1bwbvamqn-gcc-wrapper-7.4.0/bin/g++
-- Check for working CXX compiler: /nix/store/7nvy9l5jcp1c6z6n96l1a5x1bwbvamqn-gcc-wrapper-7.4.0/bin/g++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Warning at CMakeLists.txt:63 (message):
  sizeof(void*) == 8.


CMake Warning at CMakeLists.txt:64 (message):
  Not 32-bit, highly experimental!


-- Looking for pthread.h
-- Looking for pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - not found
-- Check if compiler accepts -pthread
-- Check if compiler accepts -pthread - yes
-- Found Threads: TRUE
-- Found SDL2: /nix/store/1dmh4k7vn6g4sd1vn25isc4svykxjkwj-SDL2-2.0.9/lib/libSDL2.so
-- Found SDL2_ttf: /nix/store/26lcmkgfc684fa4jvypgg9dsnf2hxxmx-SDL2_ttf-2.0.15/lib/libSDL2_ttf.so
-- Found SDL2_mixer: /nix/store/9w1f9ffr076g90d5vymiq24d193bibhq-SDL2_mixer-2.0.4/lib/libSDL2_mixer.so
CMake Error at /nix/store/m8asgav7lgbivj21pkpfjv7p6712kw9l-cmake-3.13.4/share/cmake-3.13/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
  Could NOT find sodium (missing: sodium_LIBRARY_RELEASE
  sodium_LIBRARY_DEBUG)
Call Stack (most recent call first):
  /nix/store/m8asgav7lgbivj21pkpfjv7p6712kw9l-cmake-3.13.4/share/cmake-3.13/Modules/FindPackageHandleStandardArgs.cmake:378 (_FPHSA_FAILURE_MESSAGE)
  CMake/Findsodium.cmake:227 (find_package_handle_standard_args)
  CMakeLists.txt:71 (find_package)


-- Configuring incomplete, errors occurred!
See also "/build/devilutionX-1f20338/build/CMakeFiles/CMakeOutput.log".
See also "/build/devilutionX-1f20338/build/CMakeFiles/CMakeError.log".
builder for '/nix/store/cxzwhklc3dhg1lzg9dd01kk65xi39vbn-devilutionx-0.4.0-1f20338.drv' failed with exit code 1
error: build of '/nix/store/cxzwhklc3dhg1lzg9dd01kk65xi39vbn-devilutionx-0.4.0-1f20338.drv' failed

I’m a bit lost why sodium is not found by cmake, though it is added in buildInput.

For what it helps the project’s cmakelist.txt requires it here:

Maybe libsodium should be renamed to sodium to make cmake find it?

Any help appreciated.

If it makes it easier, here it is on a branch : https://github.com/karolchmist/nixpkgs/commit/314223835a4caa1a1a4a14d7060c6b64b437893f