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/usr/lib/x86_64-linux-gnu/pkgconfig/cairo.pc is in libcairo2-dev 1.10.2-6.1ubuntu2.

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prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include

Name: cairo
Description: Multi-platform 2D graphics library
Version: 1.10.2

Requires.private:    gobject-2.0 glib-2.0    pixman-1 >= 0.18.4    fontconfig >= 2.2.95 freetype2 >= 9.7.3  libpng xcb-shm xcb >= 1.1.92 xcb-render >= 0.9.92 xrender >= 0.6 x11 
Libs: -L${libdir} -lcairo
Libs.private:          -lz -lz        
Cflags: -I${includedir}/cairo