Drawpile is a drawing program with a twist: you can share your drawing live with other people.

Some feature highlights:

• Shared canvas using the built-in server or a dedicated server
• Record, play back and export drawing sessions
• Layers and blending modes
• Text layers
• Supports pressure sensitive Wacom tablets
• Built-in chat
• Supports OpenRaster file format
• Encrypted connections using SSL

Client dependencies:

• Qt 5.0 or newer
• KF5 KArchive
• QtColorPicker

Server dependencies:

• Qt 5.0 or newer (QtCore and QtNetwork only)
• KF5 KArchive
• libsystemd (optional)
• libmicrohttpd (optional)

It's a good idea to build in a separate directory to keep build files separate from the source tree.

Example:

$ mkdir build
$ cd build
$ cmake ..
$ make

The executables will be generated in the build/bin directory. You can run them from there, or install them with make install.

The configuration step supports some options:

• CLIENT=off: don't build the client (useful when building the stand-alone server only)
• SERVER=off: don't build the stand-alone server.
• CMAKE_BUILD_TYPE=debug: enable debugging features
• INITSYS="": select init system integration (currently only "systemd" is supported.) Set this to an empty string to disable all integration.
• BUILTIN_ICONS=off: don't include icons in the executable

Example: $ cmake .. -DDEBUG=on

When compiling on Windows, cmake may complain about missing zlib. Setting the zlib path explicitly on the command line will solve this. For example:

-DZLIB_LIBRARY:FILEPATH="C:\Qt\Tools\mingw48_32\lib\libz.a" -DZLIB_INCLUDE_DIR:PATH="C:\Qt\Tools\mingw48_32\include"

On MacOS, you may need to set CMAKE_PREFIX_PATH to point to your Qt installation. For example:

$ cmake .. -DCMAKE_PREFIX_PATH=~/Qt/5.3/clang_64

Running make will generate an app bundle in the bin subdirectory of your build directory. Run macdeployqt on it to package all dependencies inside for distribution.