How to build for Android and iOS

[leasual]

Hi, when i build for iOS, it has some issue as below:
`--- stdout
cargo:rustc-link-search=/Users/james/RustProjects/pjsip-rust/pjlibs/ios/lib
cargo:rustc-link-lib=g7221codec-arm-apple-darwin_ios
cargo:rustc-link-lib=pjsip-arm-apple-darwin_ios
cargo:rustc-link-lib=gsmcodec-arm-apple-darwin_ios
cargo:rustc-link-lib=pjsip-simple-arm-apple-darwin_ios
cargo:rustc-link-lib=ilbccodec-arm-apple-darwin_ios
cargo:rustc-link-lib=pjsip-ua-arm-apple-darwin_ios
cargo:rustc-link-lib=pj-arm-apple-darwin_ios
cargo:rustc-link-lib=pjsua-arm-apple-darwin_ios
cargo:rustc-link-lib=pjlib-util-arm-apple-darwin_ios
cargo:rustc-link-lib=pjsua2-arm-apple-darwin_ios
cargo:rustc-link-lib=pjmedia-arm-apple-darwin_ios
cargo:rustc-link-lib=resample-arm-apple-darwin_ios
cargo:rustc-link-lib=pjmedia-audiodev-arm-apple-darwin_ios
cargo:rustc-link-lib=speex-arm-apple-darwin_ios
cargo:rustc-link-lib=pjmedia-codec-arm-apple-darwin_ios
cargo:rustc-link-lib=srtp-arm-apple-darwin_ios
cargo:rustc-link-lib=pjmedia-videodev-arm-apple-darwin_ios
cargo:rustc-link-lib=webrtc-arm-apple-darwin_ios
cargo:rustc-link-lib=pjnath-arm-apple-darwin_ios
cargo:rustc-link-lib=yuv-arm-apple-darwin_ios
cargo:rustc-link-lib=pjsdp-arm-apple-darwin_ios

--- stderr
./pjlibs/ios/include/pj/config.h:303:5: error: "Please specify target machine."
./pjlibs/ios/include/pj/config.h:1340:4: error: "PJ_HAS_PENTIUM is not defined!"
./pjlibs/ios/include/pj/config.h:1344:4: error: "PJ_IS_LITTLE_ENDIAN is not defined!"
./pjlibs/ios/include/pj/config.h:1348:4: error: "PJ_IS_BIG_ENDIAN is not defined!"
./pjlibs/ios/include/pj/compat/assert.h:29:12: error: 'assert.h' file not found with include; use "quotes" instead
./pjlibs/ios/include/pj/compat/ctype.h:29:12: error: 'ctype.h' file not found with include; use "quotes" instead
./pjlibs/ios/include/pj/ctype.h:48:53: warning: implicitly declaring library function 'isalnum' with type 'int (int)' [-Wimplicit-function-declaration]
./pjlibs/ios/include/pj/ctype.h:48:53: note: include the header <ctype.h> or explicitly provide a declaration for 'isalnum'
./pjlibs/ios/include/pj/ctype.h:57:53: warning: implicitly declaring library function 'isalpha' with type 'int (int)' [-Wimplicit-function-declaration]
./pjlibs/ios/include/pj/ctype.h:57:53: note: include the header <ctype.h> or explicitly provide a declaration for 'isalpha'
./pjlibs/ios/include/pj/ctype.h:75:53: warning: implicitly declaring library function 'isdigit' with type 'int (int)' [-Wimplicit-function-declaration]
./pjlibs/ios/include/pj/ctype.h:75:53: note: include the header <ctype.h> or explicitly provide a declaration for 'isdigit'
./pjlibs/ios/include/pj/ctype.h:84:53: warning: implicitly declaring library function 'isspace' with type 'int (int)' [-Wimplicit-function-declaration]
./pjlibs/ios/include/pj/ctype.h:84:53: note: include the header <ctype.h> or explicitly provide a declaration for 'isspace'
./pjlibs/ios/include/pj/ctype.h:93:53: warning: implicitly declaring library function 'islower' with type 'int (int)' [-Wimplicit-function-declaration]
./pjlibs/ios/include/pj/ctype.h:93:53: note: include the header <ctype.h> or explicitly provide a declaration for 'islower'
./pjlibs/ios/include/pj/ctype.h:103:53: warning: implicitly declaring library function 'isupper' with type 'int (int)' [-Wimplicit-function-declaration]
./pjlibs/ios/include/pj/ctype.h:103:53: note: include the header <ctype.h> or explicitly provide a declaration for 'isupper'
./pjlibs/ios/include/pj/ctype.h:119:53: warning: implicitly declaring library function 'tolower' with type 'int (int)' [-Wimplicit-function-declaration]
./pjlibs/ios/include/pj/ctype.h:119:53: note: include the header <ctype.h> or explicitly provide a declaration for 'tolower'
./pjlibs/ios/include/pj/ctype.h:126:53: warning: implicitly declaring library function 'toupper' with type 'int (int)' [-Wimplicit-function-declaration]
./pjlibs/ios/include/pj/ctype.h:126:53: note: include the header <ctype.h> or explicitly provide a declaration for 'toupper'
./pjlibs/ios/include/pj/ctype.h:135:53: warning: implicitly declaring library function 'isxdigit' with type 'int (int)' [-Wimplicit-function-declaration]
./pjlibs/ios/include/pj/ctype.h:135:53: note: include the header <ctype.h> or explicitly provide a declaration for 'isxdigit'
./pjlibs/ios/include/pj/compat/setjmp.h:29:12: error: 'setjmp.h' file not found with include; use "quotes" instead
./pjlibs/ios/include/pj/compat/setjmp.h:30:12: error: unknown type name 'jmp_buf'
./pjlibs/ios/include/pj/compat/string.h:30:13: error: 'string.h' file not found with include; use "quotes" instead
./pjlibs/ios/include/pj/compat/string.h:39:10: fatal error: 'stdio.h' file not found
clang diag: ./pjlibs/ios/include/pj/ctype.h:48:53: warning: implicitly declaring library function 'isalnum' with type 'int (int)' [-Wimplicit-function-declaration]
clang diag: ./pjlibs/ios/include/pj/ctype.h:57:53: warning: implicitly declaring library function 'isalpha' with type 'int (int)' [-Wimplicit-function-declaration]
clang diag: ./pjlibs/ios/include/pj/ctype.h:75:53: warning: implicitly declaring library function 'isdigit' with type 'int (int)' [-Wimplicit-function-declaration]
clang diag: ./pjlibs/ios/include/pj/ctype.h:84:53: warning: implicitly declaring library function 'isspace' with type 'int (int)' [-Wimplicit-function-declaration]
clang diag: ./pjlibs/ios/include/pj/ctype.h:93:53: warning: implicitly declaring library function 'islower' with type 'int (int)' [-Wimplicit-function-declaration]
clang diag: ./pjlibs/ios/include/pj/ctype.h:103:53: warning: implicitly declaring library function 'isupper' with type 'int (int)' [-Wimplicit-function-declaration]
clang diag: ./pjlibs/ios/include/pj/ctype.h:119:53: warning: implicitly declaring library function 'tolower' with type 'int (int)' [-Wimplicit-function-declaration]
clang diag: ./pjlibs/ios/include/pj/ctype.h:126:53: warning: implicitly declaring library function 'toupper' with type 'int (int)' [-Wimplicit-function-declaration]
clang diag: ./pjlibs/ios/include/pj/ctype.h:135:53: warning: implicitly declaring library function 'isxdigit' with type 'int (int)' [-Wimplicit-function-declaration]
thread 'main' panicked at 'Unable to generate bindings: ClangDiagnostic("./pjlibs/ios/include/pj/config.h:303:5: error: "Please specify target machine."\n./pjlibs/ios/include/pj/config.h:1340:4: error: "PJ_HAS_PENTIUM is not defined!"\n./pjlibs/ios/include/pj/config.h:1344:4: error: "PJ_IS_LITTLE_ENDIAN is not defined!"\n./pjlibs/ios/include/pj/config.h:1348:4: error: "PJ_IS_BIG_ENDIAN is not defined!"\n./pjlibs/ios/include/pj/compat/assert.h:29:12: error: 'assert.h' file not found with include; use "quotes" instead\n./pjlibs/ios/include/pj/compat/ctype.h:29:12: error: 'ctype.h' file not found with include; use "quotes" instead\n./pjlibs/ios/include/pj/compat/setjmp.h:29:12: error: 'setjmp.h' file not found with include; use "quotes" instead\n./pjlibs/ios/include/pj/compat/setjmp.h:30:12: error: unknown type name 'jmp_buf'\n./pjlibs/ios/include/pj/compat/string.h:30:13: error: 'string.h' file not found with include; use "quotes" instead\n./pjlibs/ios/include/pj/compat/string.h:39:10: fatal error: 'stdio.h' file not found\n")', build.rs:89:10
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace`

Do you have any idea to solve these issue? Thanks a lot.