missing C++ header

[John4650-hub]

I am building a new package which uses nlohmann's json but can't get past this error.
I installed the header from the workflow file
using the following command

sudo apt-get install nlohmann-json3-dev

Also iam using docker and have been developing from github actions. I don't know what to do .
Here's how i includer the header

#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <sstream>
#include <filesystem>
#include <unordered_map>
#include <nlohmann/json.hpp>

using namespace std;
namespace fs = filesystem;
using json = nlohmann::json;

fatal error: 'nlohmann/json.hpp' file not found

[TomJo2000]

Termux does not split out headers into separate *-dev packages.
This header should be part of the standard nlohmann-json package.

In fact it's right where it should be in the package.

[John4650-hub]

@TomJo2000 could you tell me why am getting the error

[Biswa96]

apt exists.

$ apt search nlohmann
Sorting... Done
Full Text Search... Done
nlohmann-json/stable 3.11.3 aarch64
  JSON for Modern C++

[TomJo2000]

You'll need to ensure that the necessary dependencies are available inside your docker environment.
I do not know what sort of setup you are using here, but this is not an issue with the Termux package of nlohmann-json.