These are the packages that would be merged, in order:

Calculating dependencies ...

!!! Problem resolving dependencies for =media-libs/vips-8.18.7
 done!
Dependency resolution took 0.83 s (backtrack: 0/20).


!!! The ebuild selected to satisfy "=media-libs/vips-8.18.7" has unmet requirements.
- media-libs/vips-8.18.7::gentoo USE="fontconfig highway jpeg jpeg2k png tiff -archive -deprecated -doc -exif -fftw -fits -graphicsmagick -heif -imagemagick -imagequant -introspection -jpegxl -lcms -matio -openexr -orc -pango -pdf -raw -svg -test -vala -webp"

  The following REQUIRED_USE flag constraints are unsatisfied:
    fontconfig? ( pango )

  The above constraints are a subset of the following complete expression:
    doc? ( introspection ) fontconfig? ( pango ) graphicsmagick? ( imagemagick ) test? ( jpeg png webp ) vala? ( introspection )