This file is indexed.

/usr/share/qt4/mkspecs/features/crypto.prf is in libqca2-dev 2.1.3-2ubuntu2.

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

The actual contents of the file can be viewed below.

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QCA_INCDIR = /usr/include
QCA_LIBDIR = /usr/lib/x86_64-linux-gnu

CONFIG *= qt

LINKAGE =

exists($$QCA_LIBDIR/qca.framework) {
	QMAKE_CXXFLAGS += -F$$QCA_LIBDIR
	LIBS *= -F$$QCA_LIBDIR
	INCLUDEPATH += $$QCA_LIBDIR/qca.framework/Headers
	LINKAGE = -framework qca
}

# else, link normally
isEmpty(LINKAGE) {
	INCLUDEPATH += $$QCA_INCDIR/QtCrypto
	LIBS += -L$$QCA_LIBDIR
	LINKAGE = -lqca
	CONFIG(debug, debug|release) {
		windows:LINKAGE = -lqcad
		mac:LINKAGE = -lqca_debug
	}
}

LIBS += $$LINKAGE