/usr/share/pkg-config-crosswrapper is in pkg-config 0.26-1ubuntu4.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | #! /bin/sh
# pkg-config wrapper for cross-building
# Sets pkg-config search path to target arch path only.
triplet=`basename $0 | sed -e 's:-pkg-config::'`
PKG_CONFIG_PATH=/usr/lib/${triplet}/pkgconfig:/usr/${triplet}/lib/pkgconfig pkg-config $@
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