build error

host C++: test_vector_host <= external/astl/tests/test_vector.cpp
external/astl/tests/test_vector.cpp: In function ‘bool android::testAt()’:
external/astl/tests/test_vector.cpp:649:5: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
host C: test_zipfile <= system/core/libzipfile/test_zipfile.c
system/core/libzipfile/test_zipfile.c: In function ‘main’:
system/core/libzipfile/test_zipfile.c:20:5: warning: implicit declaration of function ‘strcmp’ [-Wimplicit-function-declaration]
system/core/libzipfile/test_zipfile.c:56:5: warning: enumeration value ‘HUH’ not handled in switch [-Wswitch]
host C++: triangleCM <= development/tools/emulator/opengl/tests/translator_tests/GLES_CM/triangleCM.cpp
development/tools/emulator/opengl/tests/translator_tests/GLES_CM/triangleCM.cpp:18:17: fatal error: SDL.h: No such file or directory
compilation terminated.
make: *** [out/host/linux-x86/obj/EXECUTABLES/triangleCM_intermediates/triangleCM.o] Error 1
make: *** Waiting for unfinished jobs....
external/sqlite/dist/sqlite3.c: In function ‘fkLookupParent’:
external/sqlite/dist/sqlite3.c:55844:5: warning: assuming signed overflow does not occur when assuming that (X - c) <= X is always true [-Wstrict-overflow]