Hi, 

The Jamoma library [1] fails to build since 035844b2 [2] with :
multiple definition of "glist_reloadingabstraction".
If I add "EXTERN" before glist_reloadingabstraction declaration in g_canvas.h and forward the declaration to g_canvas.c then the library builds fine (see [3]).
But I'm not sure if this the right way to fix my issue.
Please help me to figure out if I should open a PR or find another way to fix the issue.

Cheers 

Antoine

[1] : https://github.com/jamoma/JamomaPureData
[2] : https://sourceforge.net/p/pure-data/pure-data/ci/035844b25c066685ec9c21569f05ea464a468776/
[3] : https://github.com/avilleret/pure-data/commit/1ecc6aae381039fafc641b5b3d2f0656cf4d97b9
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