Merge pull request #193 from glwagner/glw/powerpc-safe

Check if NetCDF_jll `is_available` before loading code

src/NCDatasets.jl

@@ -30,7 +30,7 @@ using Printf
 function __init__()
     # https://github.com/JuliaPackaging/Yggdrasil/pull/5319#issuecomment-1221042734
     if VERSION < v"1.9"
-        init_certificate_authority()
+        NetCDF_jll.is_available() && init_certificate_authority()
     end
 end