I've created thin wrapper under MuPDF for WP8 and Windows 8 RT as WinRT component - https://github.com/MishaUliutin/MuPDF.WinRT. But there are some problems with build under ARM configuration 1. asm extension is disabled on this architecture and there is asm in OpenJpeg library and OpenJpeg guys have already done change - https://code.google.com/p/openjpeg/source/detail?r=2299. Could you pull it to your repository? 2. there is no struct timeval in Windows 8 RT and you use it in mupdf/fitz/base_time.c file. Could you add conditional compilation for this?