This file is indexed.

/usr/lib/ecl-15.3.7/build-stamp is in ecl 15.3.7+dfsg1-2+deb9u1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Linux x86-ubc-01 4.9.0-3-amd64 #1 SMP Debian 4.9.30-2+deb9u5 (2017-09-19) x86_64 GNU/Linux

It was created by ecl configure 15.3.7, which was
generated by GNU Autoconf 2.69.  Invocation command line was

  $ /build/ecl-XnzXxT/ecl-15.3.7+dfsg1/src/configure --srcdir=/build/ecl-XnzXxT/ecl-15.3.7+dfsg1/src --build=x86_64-linux-gnu --prefix=/usr --includedir=${prefix}/include --mandir=${prefix}/share/man --infodir=${prefix}/share/info --sysconfdir=/etc --localstatedir=/var --disable-silent-rules --libexecdir=${prefix}/lib/ecl --disable-maintainer-mode --disable-dependency-tracking --prefix=/usr --mandir=${prefix}/share/man --infodir=${prefix}/share/info --with-system-gmp=yes --with-tcp --with-clx --enable-threads=yes --enable-boehm=system --enable-libatomic=system --disable-rpath --with-x