exit() prototype is in stdlib.h, include it
this is needed to support Apple's clang 12, the compiler in Xcode 12 on macOS 10.15 and upcoming macOS 11.
configure was regenerated by running autoreconf -ivf with autoconf version 2.69
this is needed to support Apple's clang 12, the compiler in Xcode 12 on macOS 10.15 and upcoming macOS 11.
configure was regenerated by running autoreconf -ivf with autoconf version 2.69