Error while setting up tests in xapian-letor

Hello,

While setting up tests module for letor (in xapian-letor/tests; I copied
the entire tests folder from xapian-core), I am getting build errors of the
following type:

g++ -DHAVE_CONFIG_H -I. -I..  -I.. -I../common -I../include -I../include
> -I./harness -I../../xapian-core/include  -Wall -W -Wredundant-decls
> -Wpointer-arith -Wcast-qual -Wcast-align -Wno-long-long -Wformat-security
> -fno-gnu-keywords -Wundef -Woverloaded-virtual -Wshadow -Wstrict-overflow=1
> -Winit-self -Wmissing-declarations -Werror -fvisibility=hidden -g -O2
> -std=gnu++11 -MT harness/cputimer.o -MD -MP -MF $depbase.Tpo -c -o
> harness/cputimer.o harness/cputimer.cc &&\
> mv -f $depbase.Tpo $depbase.Po
> In file included from harness/cputimer.cc:25:
> In file included from ./harness/testsuite.h:29:
> In file included from ../common/output.h:39:
> ../../xapian-core/include/xapian/database.h:29:3: error: "Never use
> <xapian/database.h> directly; include <xapian.h> instead."
> # error "Never use <xapian/database.h> directly; include <xapian.h>
> instead."


Could you please suggest a workaround for this?


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