No dynamic library is created

[ryandesign]

0.1.2 built and installed both static and dynamic libraries, and the programs arow_test and arow_learn were linked with the dynamic library.

In 0.1.3, only a static library is produced, and the programs presumably link with that static library, since the 0.1.3 programs are much larger than their 0.1.2 counterparts.

These observations are from macOS 10.13.6.