FRAMECPP_VERSION_NUMBER is not defined with a value in the release builds (SL & Debian)

framecpp/Common/FrameSpec.hh.in contains:

/* clang-format off */ #define FRAMECPP_VERSION_NUMBER @FRAMECPP_VERSION_NUMBER@ /* clang-format on */

Which should expand at build time to the proper build number, but on both SL 7 and Debian, this is not expanding properly and the resulting FrameSpec.hh contains:

/* clang-format off */ #define FRAMECPP_VERSION_NUMBER /* clang-format on */

Making the version detection broken.