dune_build_error.txt

[ /data/data/com.termux/files/usr/tmp/3mZRdb5YyY/dune | main ] $ ./dune.exe build dune.install --verbose  
Warning: Unable to read directory /data/data. Will not look for root in
parent directories.
Reason: /data/data: Permission denied
To remove this warning, set your root explicitly using --root.
Shared cache: disabled
Workspace root: /data/data/com.termux/files/usr/tmp/3mZRdb5YyY/dune
Auto-detected concurrency: 8
Dune context:                   
 { name = "default"
 ; kind = "default"
 ; profile = Dev
 ; merlin = true
 ; for_host = None
 ; fdo_target_exe = None
 ; build_dir = In_build_dir "default"
 ; ocaml_bin = External "/data/data/com.termux/files/home/.opam/5.0.0/bin"
 ; ocaml =
     Ok External "/data/data/com.termux/files/home/.opam/5.0.0/bin/ocaml"
 ; ocamlc =
     External "/data/data/com.termux/files/home/.opam/5.0.0/bin/ocamlc.opt"
 ; ocamlopt =
     Ok
       External
         "/data/data/com.termux/files/home/.opam/5.0.0/bin/ocamlopt.opt"
 ; ocamldep =
     Ok
       External
         "/data/data/com.termux/files/home/.opam/5.0.0/bin/ocamldep.opt"
 ; ocamlmklib =
     Ok
       External
         "/data/data/com.termux/files/home/.opam/5.0.0/bin/ocamlmklib.opt"
 ; installed_env =
     map
       { "INSIDE_DUNE" :
           "/data/data/com.termux/files/usr/tmp/3mZRdb5YyY/dune/_build/default"
       ; "OCAML_COLOR" : "always"
       ; "OPAMCOLOR" : "always"
       }
 ; findlib_paths =
     [ External "/data/data/com.termux/files/home/.opam/5.0.0/lib/ocaml"
     ; External "/data/data/com.termux/files/home/.opam/5.0.0/lib"
     ]
 ; ocaml_config =
     { version = "5.0.0"
     ; standard_library_default =
         "/data/data/com.termux/files/home/.opam/5.0.0/lib/ocaml"
     ; standard_library =
         "/data/data/com.termux/files/home/.opam/5.0.0/lib/ocaml"
     ; standard_runtime = "the_standard_runtime_variable_was_deleted"
     ; ccomp_type = "cc"
     ; c_compiler = "gcc"
     ; ocamlc_cflags =
         [ "-O2"; "-fno-strict-aliasing"; "-fwrapv"; "-pthread"; "-fPIC" ]
     ; ocamlc_cppflags = [ "-D_FILE_OFFSET_BITS=64" ]
     ; ocamlopt_cflags =
         [ "-O2"; "-fno-strict-aliasing"; "-fwrapv"; "-pthread"; "-fPIC" ]
     ; ocamlopt_cppflags = [ "-D_FILE_OFFSET_BITS=64" ]
     ; bytecomp_c_compiler =
         [ "gcc"
         ; "-O2"
         ; "-fno-strict-aliasing"
         ; "-fwrapv"
         ; "-pthread"
         ; "-fPIC"
         ; "-D_FILE_OFFSET_BITS=64"
         ]
     ; bytecomp_c_libraries = [ "-lm"; "-lpthread" ]
     ; native_c_compiler =
         [ "gcc"
         ; "-O2"
         ; "-fno-strict-aliasing"
         ; "-fwrapv"
         ; "-pthread"
         ; "-fPIC"
         ; "-D_FILE_OFFSET_BITS=64"
         ]
     ; native_c_libraries = [ "-lm"; "-lpthread" ]
     ; native_pack_linker = [ "ld"; "-r"; "-o" ]
     ; cc_profile = []
     ; architecture = "arm64"
     ; model = "default"
     ; int_size = 63
     ; word_size = 64
     ; system = "linux"
     ; asm = [ "gcc"; "-c" ]
     ; asm_cfi_supported = true
     ; with_frame_pointers = false
     ; ext_exe = ""
     ; ext_obj = ".o"
     ; ext_asm = ".s"
     ; ext_lib = ".a"
     ; ext_dll = ".so"
     ; os_type = "Unix"
     ; default_executable_name = "a.out"
     ; systhread_supported = true
     ; host = "aarch64-unknown-linux-gnu"
     ; target = "aarch64-unknown-linux-gnu"
     ; profiling = false
     ; flambda = false
     ; spacetime = false
     ; safe_string = true
     ; exec_magic_number = "Caml1999X032"
     ; cmi_magic_number = "Caml1999I032"
     ; cmo_magic_number = "Caml1999O032"
     ; cma_magic_number = "Caml1999A032"
     ; cmx_magic_number = "Caml1999Y032"
     ; cmxa_magic_number = "Caml1999Z032"
     ; ast_impl_magic_number = "Caml1999M032"
     ; ast_intf_magic_number = "Caml1999N032"
     ; cmxs_magic_number = "Caml1999D032"
     ; cmt_magic_number = "Caml1999T032"
     ; natdynlink_supported = true
     ; supports_shared_libraries = true
     ; windows_unicode = false
     }
 ; instrument_with = []
 }
Actual targets:                   
- _build/default/dune.install
Error: /data/data: Permission denied 
-> required by
   _build/default/bin/.main.eobjs/build_info__Build_info_data.ml-gen
-> required by
   _build/default/bin/.main.eobjs/native/build_info__Build_info_data.cmx
-> required by _build/default/bin/main.exe
-> required by _build/install/default/bin/dune
-> required by _build/default/dune.install