# Build Instructions

## Requirements

* Boost (1.63 or newer)
* libiconv
* libpEpAdapter
* pEpEngine – see next section
* GoogleTest (GTest) – not to use library, but to run the unittests. :-)
  (for Windows you might follow these instructions:
  <https://docs.microsoft.com/en-us/visualstudio/test/how-to-use-google-test-for-cpp?view=vs-2019>)

## Solve the cyclic dependency to pEpEngine
To build p≡p MIME it's necessary that header files of p≡p engine are already
installed. Because of the dependency loop of p≡p MIME needing these headers and
p≡p engine depending on p≡p MIME you best do things in this sequence:

 1. cd pEpEngine && make -C src install_headers
 1. cd pEpMIME/src && make install
 1. cd pEpEngine && make install

The build of p≡p MIME can be customized. Makefile variable PREFIX is the
install directory. The environment variables CXXFLAGS and LDFLAGS are being
used. So a typical build on macOS i.e. looks like this:

CXXFLAGS=-I/opt/local/include LDFLAGS=-L/opt/local/lib make PREFIX=$HOME -j4 all install