/usr/lib/x86_64-linux-gnu/pkgconfig/gbm.pc is in libgbm-dev 18.0.0~rc5-1ubuntu1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: gbm
Description: Mesa gbm library
Requires.private:
Version: 18.0.0-rc5
Libs: -L${libdir} -lgbm
Libs.private: -ldl
Cflags: -I${includedir}
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