user/xkeyboard-config: ERROR: xkeyboard-config: builddeps failed (cmd:xsltproc)

Why is this happening? libxslt definitely has xsltproc.

>>> xkeyboard-config: Building user/xkeyboard-config 2.30-r0 (using abuild 3.4.2-r0) started Fri, 14 Jan 2022 19:54:52 +0000
>>> xkeyboard-config: Checking sanity of /root/packages/user/xkeyboard-config/APKBUILD...
>>> xkeyboard-config: Analyzing dependencies...
ERROR: unable to select packages:
  cmd:xsltproc (virtual):
    provided by: libxslt
    required by: .makedepends-xkeyboard-config-20220114.195455[cmd:xsltproc]
>>> ERROR: xkeyboard-config: builddeps failed