casadi: build on darwin

pkgs/by-name/ca/casadi/package.nix

@@ -96,6 +96,17 @@ stdenv.mkDerivation (finalAttrs: {
       substituteInPlace swig/python/CMakeLists.txt --replace-fail \
         "if (SWIG_IMPORT)" \
         "if (NOT SWIG_IMPORT)"
+    ''
+    + lib.optionalString stdenv.isDarwin ''
+      # this is only printing stuff, and is not defined on all CPU
+      substituteInPlace casadi/interfaces/hpipm/hpipm_runtime.hpp --replace-fail \
+        "d_print_exp_tran_mat" \
+        "//d_print_exp_tran_mat"
+
+      # fix missing symbols
+      substituteInPlace cmake/FindCLANG.cmake --replace-fail \
+        "clangBasic)" \
+        "clangBasic clangASTMatchers clangSupport)"
     '';
 
   nativeBuildInputs = [
@@ -138,7 +149,8 @@ stdenv.mkDerivation (finalAttrs: {
     ++ lib.optionals pythonSupport [
       python3Packages.numpy
       python3Packages.python
-    ];
+    ]
+    ++ lib.optionals stdenv.isDarwin [ llvmPackages_17.openmp ];
 
   cmakeFlags = [
     (lib.cmakeBool "WITH_PYTHON" pythonSupport)