compilation of unit test fail on alpine 3.10

https://jenkins.isc.org/job/kea-1.7/job/ut-basic/259/execution/node/163/log/

21:47:32.459  ccache c++ -DHAVE_CONFIG_H -I. -I../../../..  -I../../../../src/lib -I../../../../src/lib  -DTEST_DATA_BUILDDIR=\"/home/jenkins/workspace/kea-1.7/ut-basic/src/lib/util/tests\" -DTEST_DATA_TOPBUILDDIR=\"/home/jenkins/workspace/kea-1.7/ut-basic\" -I/opt/googletest/googletest -I/opt/googletest/googletest/include -DOS_LINUX  -Wall -Wextra -Wnon-virtual-dtor -Wwrite-strings -Woverloaded-virtual -Wno-sign-compare -pthread -Wno-missing-field-initializers -fPIC -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -MT run_unittests-qid_gen_unittest.o -MD -MP -MF .deps/run_unittests-qid_gen_unittest.Tpo -c -o run_unittests-qid_gen_unittest.o `test -f 'qid_gen_unittest.cc' || echo './'`qid_gen_unittest.cc
21:47:33.048  chrono_time_utils_unittest.cc: In member function 'virtual void ChronoTimeUtilsTest_epoch_Test::TestBody()':
21:47:33.048  chrono_time_utils_unittest.cc:29:21: error: 'timelocal' was not declared in this scope
21:47:33.048       time_t tepoch = timelocal(&epoch);