MPFR not detected if installed in `/usr/lib64`

[Alessandro-Barbieri]

checking whether MPFR is available...... no
configure: error: required MPFR library not found

mpfr files in my system

/usr/include/mpf2mpfr.h
/usr/include/mpfr.h
/usr/lib/debug/usr/lib64/libmpfr.so.6.1.0.debug
/usr/lib64/libmpfr.so -> libmpfr.so.6.1.0
/usr/lib64/libmpfr.so.6 -> libmpfr.so.6.1.0
/usr/lib64/libmpfr.so.6.1.0
/usr/lib64/pkgconfig/mpfr.pc
/usr/share/doc/mpfr-4.1.0
/usr/share/doc/mpfr-4.1.0/AUTHORS
/usr/share/doc/mpfr-4.1.0/BUGS
/usr/share/doc/mpfr-4.1.0/FAQ.html
/usr/share/doc/mpfr-4.1.0/NEWS
/usr/share/doc/mpfr-4.1.0/TODO
/usr/share/doc/mpfr-4.1.0/examples
/usr/share/doc/mpfr-4.1.0/examples/ReadMe
/usr/share/doc/mpfr-4.1.0/examples/can_round.c
/usr/share/doc/mpfr-4.1.0/examples/divworst.c
/usr/share/doc/mpfr-4.1.0/examples/rndo-add.c
/usr/share/doc/mpfr-4.1.0/examples/sample.c
/usr/share/doc/mpfr-4.1.0/examples/threads.c
/usr/share/doc/mpfr-4.1.0/examples/version.c
/usr/share/info/mpfr.info