Dependencies to be checked by configure are declared within the <deps> section.

The <deps> tag itself has two attributes: lang for the programming language you want to have code generated for and platform for the operating systems to be supported.

Set lang to "c" for plain C code or "c++" for C++ code generation. By default C code is generated. C++ code generation should be selected for extensions making use of C++ libraries.

Possible values for platform are unix for all Unix-like platforms supporting configure scripts, win32 for Microsoft Windows with Microsoft VisualStudio as developement platform or all for both supported platforms.

Within the <deps> section it is possible to define configure parameters, to specify needed header files and libraries and to add existing files to the extension.