Hi, On core-updates, librsvg-2.40 fails to compile due to a single failing test (I've confirmed the failure on x86_64 and i686, though the package is only used/needed on non-x86_64 systems for gtk+ and others; it also affects wine and wine-staging on x86_64 as they are 32-bit packages). I was able to track down the test failure to a text rendering difference between Pango 1.48 and 1.50, which led to the text being one pixel line higher between the reference and output images. On Monday I submitted https://issues.guix.gnu.org/62646 which adds a phase to librsvg-2.40 to adjust the output Y coordinate of the SVG transformation matrix by one for the failing test so that it passes with Pango 1.50.
Cheers, Kaelyn