lnav build failed

In file included from /usr/include/bits/libc-header-start.h:33:0,
                 from /usr/include/stdio.h:28,
                 from data_parser.hh:33,
                 from elem_to_json.hh:34,
                 from elem_to_json.cc:32:
/usr/include/features.h:180:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp]
 # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
   ^~~~~~~
  CXX      environ_vtab.o
In file included from /usr/include/assert.h:35:0,
                 from environ_vtab.cc:32:
/usr/include/features.h:180:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp]
 # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
   ^~~~~~~
  CXX      extension-functions.o
extension-functions.cc:277:1: error: narrowing conversion of '4294967168' from 'unsigned int' to 'long int' inside { } [-Wnarrowing]
 };
 ^
extension-functions.cc:277:1: error: narrowing conversion of '4294965248' from 'unsigned int' to 'long int' inside { } [-Wnarrowing]
extension-functions.cc:277:1: error: narrowing conversion of '4294901760' from 'unsigned int' to 'long int' inside { } [-Wnarrowing]
make[2]: *** [Makefile:920: extension-functions.o] Error 1
make[2]: Leaving directory '/tmp/yaourt-tmp-tiagoboldt/aur-lnav/src/lnav-0.8.2/src'
make[1]: *** [Makefile:661: all] Error 2
make[1]: Leaving directory '/tmp/yaourt-tmp-tiagoboldt/aur-lnav/src/lnav-0.8.2/src'
make: *** [Makefile:470: all-recursive] Error 1
==> ERROR: A failure occurred in build().
    Aborting...
==> ERROR: Makepkg was unable to build lnav.
==> Restart building lnav ? [y/N]