/usr/share/doc/librtfilter1/examples/Makefile is in librtfilter-dev 1.1-4.
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 | LIBS=-lrtfilter
all: butterworth
butterworth: butterworth.c
$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)
clean:
$(RM) butterworth
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