Lighttpd

I'm trying to build 1.4.63 on glibc 2.16 where clock_gettime is in librt.so

[31/195] Linking target src/test_common
FAILED: src/test_common 
/pkg/bin/gcc  -o src/test_common src/test_common.p/t_test_common.c.o src/test_common.p/t_test_array.c.o src/test_common.p/t_t>
/pkg/bin/ld: src/test_common.p/log.c.o: in function `log_buffer_timestamp':
/home/gzp/build.pkg/lighttpd/build/1.4.63/../../src/1.4.63/src/log.c:104: undefined reference to `clock_gettime'
collect2: error: ld returned 1 exit status

and

[33/195] Linking target src/test_configfile
FAILED: src/test_configfile 
/pkg/bin/gcc  -o src/test_configfile src/test_configfile.p/t_test_configfile.c.o src/test_configfile.p/buffer.c.o src/test_co>
/pkg/bin/ld: src/test_configfile.p/log.c.o: in function `log_buffer_timestamp':
/home/gzp/build.pkg/lighttpd/build/1.4.63/../../src/1.4.63/src/log.c:104: undefined reference to `clock_gettime'
collect2: error: ld returned 1 exit status

I'm using meson and ninja for configuring/building.
(here in redmine could be a new category "build_meson" created?)

Found the block:

conf_data.set('HAVE_CLOCK_GETTIME', compiler.has_header_symbol('time.h', 'clock_gettime'))
clock_lib = []
if not(conf_data.get('HAVE_CLOCK_GETTIME'))
        if compiler.has_function('clock_gettime', args: defs + ['-lrt'], prefix: '#include <time.h>')
                conf_data.set('HAVE_CLOCK_GETTIME', true)
                clock_lib = [ compiler.find_library('rt') ]
        endif
endif

in src/meson.build for checking clock_gettime() but I have no clue how should I fix the problem.