# nix-env -i vips
PKG1=$(find /nix/store/*/lib/pkgconfig/* -name 'vips.pc' | sed 's/vips\.pc$//')
PKG2=$(find /nix/store/*/lib/pkgconfig/* -name 'gobject-2.0.pc' | sed 's/gobject-2.0\.pc$//')

export PKG_CONFIG_PATH=$PKG1:$PKG2