warnings building tlsdate on android

gistfile1.txt

make[2]: Entering directory `/home/user/src/tlsdate-android/external/tlsdate'
  CC     src/compat/src_compat_libtlsdate_compat_la-clock-linux.lo
  CCLD   src/compat/libtlsdate_compat.la
  CC     src/src_tlsdate_routeup-routeup.o
  CC     src/src_tlsdate_routeup-util.o
  CCLD   src/tlsdate-routeup
  CC     src/src_tlsdate-tlsdate.o
  CCLD   src/tlsdate
  CC     src/src_tlsdate_helper-tlsdate-helper.o
  CC     src/src_tlsdate_helper-util.o
  CCLD   src/tlsdate-helper
  CC     src/android/src_tlsdated-android.o
  CC     src/src_tlsdated-conf.o
  CC     src/src_tlsdated-routeup.o
  CC     src/src_tlsdated-tlsdated.o
  CC     src/src_tlsdated-util.o
  CCLD   src/tlsdated
  CC     src/src_tlsdate_dbus_announce-tlsdate-dbus-announce.o
  CCLD   src/tlsdate-dbus-announce
  CC     src/conf.o
  CC     src/conf-unittest.o
src/conf-unittest.c: In function 'fopenstr':
src/conf-unittest.c:24:3: warning: return makes pointer from integer without a cast [enabled by default]
  CC     src/android/android.o
  CC     src/android/fmemopen.o
src/android/fmemopen.c: In function 'fmemopen':
src/android/fmemopen.c:175:8: warning: assignment makes pointer from integer without a cast [enabled by default]
  CCLD   src/conf_unittest
  CC     src/routeup.o
  CC     src/tlsdated-unittest.o
src/tlsdated-unittest.c: In function 'tempdir_setup':
src/tlsdated-unittest.c:26:5: warning: assignment makes pointer from integer without a cast [enabled by default]
  CC     src/util.o
  CC     src/tlsdated.o
  CCLD   src/tlsdated_unittest
  CC     src/proxy-bio-unittest.o
  CCLD   src/proxy-bio_unittest
make[2]: Leaving directory `/home/user/src/tlsdate-android/external/tlsdate'
make[1]: Leaving directory `/home/user/src/tlsdate-android/external/tlsdate'