This set of compilers and tools using following licenses: Software Version License ------------------------------------------------------- GNU gcc 7.1.0 GPLv2,GPLv3 GNU binutils 2.28 GPLv2,GPLv3 GNU GMP 6.1.2 GPLv2,GPLv3 GNU MPFR 3.1.5 GPLv2,GPLv3 isl 0.16.1 MIT (MIT License) gdb 7.12 GPLv2,GPLv3 bzip2 1.0.6 BSD-style license zlib 1.2.11 zlib license (https://www.zlib.net/zlib_license.html) mingw64 5.0.2 ZPL v2.1 (Zope Public License Version 2.1)