Build problem for geany-1.31.5

I've been using ```geanypy``` as the interface for my https://github.com/mdda/geany-project-tree for some time now : Your plugin has been super-useful.

Fedora 27 recently arrived, and geany-plugins-geanypy doesn't appear to have been successfully brought along in RPM form. So I'm now attempting an install from source.

RPMs installed :
```
geany-1.31-5.fc27.x86_64
geany-plugins-common-1.31-5.fc27.x86_64
geany-devel-1.31-5.fc27.x86_64
geany-libgeany-1.31-5.fc27.x86_64
```
The configure / make / make install process appears to complete successfully, but (when loading geany's plugin manager), the following appears in the status window :
```
13:49:42: The plugin "geanypy.so" is not binary compatible with this release of Geany - please recompile it.
```
Which would be a useful, if I had not just recompiled ```geanypy.so```.

Has there been a change in the geany plugin interface that's causing this? Next steps?