embit PyPI artifacts do not include prebuilt libsecp256k1 binaries. If you want the optional ctypes backend, build and install libsecp256k1 locally.

Clone embit recursively

We are using the libsecp256k1 fork - secp256k1-zkp.

Start by cloning embit with the --recursive flag:

git clone --recursive https://github.com/diybitcoinhardware/embit.git

This will automatically pull in the libsecp256k1-zkp repo and checkout the correct commit within that repo.

Building the library

This directory (secp256k1/ in the embit root) already has a fully-configured Makefile to run the compilation for you.

On your target platform run:

make

Install the resulting library into a standard system library location so the dynamic loader can find it (for example /usr/local/lib on Unix-like systems), then refresh your linker environment as needed for your platform.

Note: runtime lookup prefers local secp256k1/secp256k1-zkp/.libs and system library paths. src/embit/util/prebuilt is still checked last for compatibility with older local setups, but binaries are not shipped by this project.

To clean build directory use:

make clean

Cross-compiling Windows DLL

Toolchain install

Linux

In the console type:

sudo apt-get install gcc-mingw-w64-x86-64 g++-mingw-w64-x86-64 wine64

Mac

Assuming that Homebrew package manager is installed, in the console type:

brew install mingw-w64
brew install --cask xquartz
brew install --cask wine-stable

Windows

Assuming that Chocolatey package manager is installed, in the Powershell type:

choco install mingw make

Building the library

To build the Windows DLL and the companion library from other platforms run:

make CROSS_DLL=1