For the record, I also needed to install libpango1.0-dev to fix that.
No idea why it work in previous sage versions, but no longer from 8.9.beta2 

Am 16.07.19 um 12:48 schrieb Clemens Heuberger:
On one of my machines (Linux Mint 18.2 Sonya), I get the following reproducible doctest failure:

sage -t --long --warn-long 48.6 src/sage/interfaces/
File "src/sage/interfaces/", line 613, in sage.interfaces.r.R.png
Failed example:
     s = r.eval('capabilities("png")') # Should be on Linux and Solaris
Expected nothing
     No protocol specified

I used this machine with a patchbot until recently (8.9.beta1); had to recompile from scratch due to a strange error ( then had some issues compiling (python2 and python3 compiled about readline; after installing all kind of recommended ubuntu packages, compilation went through), and now I only have this problem here left.

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