/usr/lib/x86_64-linux-gnu/pkgconfig/allegro.pc is in liballegro4-dev 2:4.4.2-10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
version=4.4.2
suffix=
Name: allegro
Description: Allegro game programming library
Version: ${version}
Libs: -L${libdir} -lalleg${suffix}
Libs.private: -lm -lpthread -lrt -lSM -lICE -lX11 -lXext -lXext -lXcursor -lXcursor -lXpm -lXxf86vm -ldl
Cflags: -I${includedir}
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