Add gtk3 for mac
@@ -61,7 +61,7 @@ requirements:
# old version not available for windows
# https://github.com/conda-forge/conda-forge-pinning-feedstock/pull/627
- gdk-pixbuf # [unix]
- - gtk3 # [linux]
+ - gtk3 # [unix]
# libglu seems necessary for osx too
# https://github.com/conda-forge/libglu-feedstock/pull/17
- libglu # [linux]
