ICU4C_59.1-CMakeLists.txt-uwmsg.c-Error

[ 99%] Building C object CMakeFiles/uconv.dir/icu/source/extra/uconv/uwmsg.c.o
/usr/bin/cc -DDEFAULT_ICU_PLUGINS="" -DPIC -DU_ATTRIBUTE_DEPRECATED="" -DU_COMMON_IMPLEMENTATION -DU_HAVE_ATOMIC=1 -DU_HAVE_ELF_H=1 -DU_HAVE_STRTOD_L=1 -DU_I18N_IMPLEMENTATION -D_REENTRANT -I/home/ats/Projects/Tools/ProjectPassage/Source/ThirdParty/ICU/icu4c-59.1/icu/source/common -I/home/ats/Projects/Tools/ProjectPassage/Source/ThirdParty/ICU/icu4c-59.1/icu/source/i18n  -g   -std=gnu99 -o CMakeFiles/uconv.dir/icu/source/extra/uconv/uwmsg.c.o   -c /home/ats/Projects/Tools/ProjectPassage/Source/ThirdParty/ICU/icu4c-59.1/icu/source/extra/uconv/uwmsg.c
In file included from /home/ats/Projects/Tools/ProjectPassage/Source/ThirdParty/ICU/icu4c-59.1/icu/source/common/unicode/utypes.h:38:0,
                 from /home/ats/Projects/Tools/ProjectPassage/Source/ThirdParty/ICU/icu4c-59.1/icu/source/common/unicode/ucnv_err.h:88,
                 from /home/ats/Projects/Tools/ProjectPassage/Source/ThirdParty/ICU/icu4c-59.1/icu/source/common/unicode/ucnv.h:52,
                 from /home/ats/Projects/Tools/ProjectPassage/Source/ThirdParty/ICU/icu4c-59.1/icu/source/extra/uconv/uwmsg.c:18:
/home/ats/Projects/Tools/ProjectPassage/Source/ThirdParty/ICU/icu4c-59.1/icu/source/common/unicode/umachine.h:343:13: error: unknown type name ‘char16_t’
     typedef char16_t UChar;
             ^~~~~~~~
make[2]: *** [CMakeFiles/uconv.dir/icu/source/extra/uconv/uwmsg.c.o] Error 1
make[1]: *** [CMakeFiles/uconv.dir/all] Error 2
make: *** [all] Error 2