configure: error: cannot compute sizeof (void *), 77 -during configuration process

Hi.I have a question.

Please have a look at this part of configure.in script that I trying to
modify for my needs.

AM_CONDITIONAL(ENABLE_SHAGA, false)
AC_ARG_ENABLE(shaga,
[ --enable-shaga Enable ShagaEngine support],
[ if test "$enableval" != "no"; then
    echo "ShagaEngine support enabled"
    AC_DEFINE(USE_SHAGA, 1, [Define this to include code for ShagaEngine.])
    AM_CONDITIONAL(ENABLE_SHAGA, true)
        CFLAGS="$CFLAGS -L../shaga -lshaga"
fi
])

When I trying to configure (bootstrap.sh;./configure
--prefix=/usr/local/proxy_test --enable-shaga)
 squid i get the error "configure: error: cannot compute sizeof (void *), 77
".

Otherwise, when I remove "-L../shaga -lshaga" ,all is going Ok.
I cannot understand what is happening.
Can anyone help/explain me what does this mean?
Thanks in advance!

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