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To build WebkitFLTK (Fifth's main dependency) and Fifth, you need these dependencies:

• zlib, png, jpeg
• libxslt, libxml2
• sqlite3
• freetype, fontconfig, cairo
• openssl >= 0.9.8k
• curl
• icu and harfbuzz (with icu backend enabled)
• FLTK >= 1.3.3, preferably latest 1.3 svn

In addition to the common ones, Fifth requires:

• liburlmatch
• physfs

The required compiler is the same as for WebkitFLTK: a compliant C++11 one. GCC 4.7.3 minimum, 4.8.3 and 5.2.0 tested, clang may work but has not been tested.