/usr/lib/pkgconfig/thunderbird.pc is in thunderbird-dev 1:52.8.0-1~deb8u1.
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
sdkdir=${prefix}/lib/thunderbird-devel/
libdir=${sdkdir}lib
includedir=${sdkdir}include
idldir=${sdkdir}idl
Name: icedove
Description: Thunderbird Development Files
Version: 52.8.0
Requires: nspr >= 4.8.2
Libs: -L${libdir} -lxpcomglue_s -lxul -lmozalloc -lldap60 -lprldap60
Cflags: -I${includedir}
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