Autoconf-based projects avoid installing `config.h` by default on purpose. [It's a thorny issue, solvable, but not without effort.](https://www.sourceware.org/autobook/autobook/autobook_66.html).
Autoconf-based projects avoid installing `config.h` by default on purpose. [It's a thorny issue, solvable, but not without effort.](https://www.sourceware.org/autobook/autobook/autobook_66.html).