iOS Prerequisites

1. The following packages are required by the build scripts.

autoconf automake libtool pkg-config curl git

2. These optional packages should be installed only if you want to build corresponding external libraries.

cmake gcc gperf texinfo yasm nasm bison autogen wget autopoint meson ninja ragel

• autogen required for libsndfile
• bison > 2.4, wget, autopoint required for gnutls
• cmake > 3.9 required by libwebp and x265
• gcc required by freetype and fribidi
• gperf required by fontconfig
• meson > 0.56, ninja for dav1d
• nasm required for x264 and dav1d on x86/x86-64 platforms
• ragel required by harfbuzz
• texinfo required by gmp on some platforms
• yasm required for libvpx and x265 on some platforms

3. iOS builds require these additional packages.

• Xcode 8.0 or later
• iOS SDK 10 or later
• Command Line Tools