Description of problem: avr-libc fails to build from source for Fedora EPEL7 on RHELSA-7.2. Version-Release number of selected component (if applicable): avr-libc-1.8.0-5.el7 How reproducible: consistently Steps to Reproduce: 1. On a RHELSA-7.2 host: mock rebuild avr-libc-1.8.0-5.el7.src.rpm 2. 3. Actual results: Fails to build with the following error: configure: error: cannot guess build type; you must specify one Expected results: builds without errors. Additional info: According to the spec file: #autoreconf -fiv # required for aarch64 support, not needed since autotools 2.69+ however RHELSA-7.2 provides autoconf-2.69-11.el7, and the build still fails. If I uncomment that line: autoreconf -fiv # required for aarch64 support, not needed since autotools 2.69+ the build completes successfully.