/usr/lib/x86_64-linux-gnu/pkgconfig/glesv1_cm.pc is in libgles1-mesa-dev 13.0.6-1+b2.
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=${prefix}/include
Name: glesv1_cm
Description: Mesa OpenGL ES 1.1 CM library
Requires.private:
Version: 13.0.6
Libs: -L${libdir} -lGLESv1_CM
Libs.private: -lm -lpthread -ldl
Cflags: -I${includedir}
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