build with command line

[hannesa2]

I can't build with command line ./gradlew clean build
I changed some minor paths and make ./gradew execute able for a Mac on this PR #12

but I see this and have no clue, what's wrong here, probably someone has a clue what's wrong here

:app:compileArm64-v8aDebugArmNdklibrarysampleSharedLibraryNdklibrarysampleMainCpp
/Users/hannes/git/openCV/OpenCV-AndroidSamples/app/src/main/jni/DetectionBasedTracker.cpp:1:17: fatal error: jni.h: No such file or directory
#include <jni.h>
^
compilation terminated.

/Users/hannes/git/openCV/OpenCV-AndroidSamples/app/src/main/jni/Tutorial2.cpp:1:17: fatal error: jni.h: No such file or directory
#include <jni.h>
^
compilation terminated.

:app:compileArm64-v8aDebugArmNdklibrarysampleSharedLibraryNdklibrarysampleMainCpp FAILED

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':app:compileArm64-v8aDebugArmNdklibrarysampleSharedLibraryNdklibrarysampleMainCpp'.

Multiple build operations failed.
C++ compiler failed while compiling Tutorial2.cpp.
C++ compiler failed while compiling DetectionBasedTracker.cpp.
See the complete log at: file:///Users/hannes/git/openCV/OpenCV-AndroidSamples/app/build/tmp/compileArm64-v8aDebugArmNdklibrarysampleSharedLibraryNdklibrarysampleMainCpp/output.txt

[hannesa2]

With last commit, I solved previous error, and now I run into this

/Users/hannes/Development/my-android-toolchain/sysroot/usr/include/signal.h:96:18: error: expected ';' at end of member declaration
sighandler_t sa_handler;
^
/Users/hannes/Development/my-android-toolchain/sysroot/usr/include/signal.h:96:18: error: expected unqualified-id before '.' token
sighandler_t sa_handler;
^
/Users/hannes/Development/my-android-toolchain/sysroot/usr/include/signal.h:97:12: error: expected ')' before '.' token
void (sa_sigaction)(int, struct siginfo, void*);