Windows 32bit native build.

src/main/c/configure.ac

@@ -1,6 +1,6 @@
 AC_PREREQ([2.61])
 AC_INIT([libusb4java], [1.0.0], [k@ailis.de])
-AM_INIT_AUTOMAKE([foreign -Wall -Werror -Wno-extra-portability])
+AM_INIT_AUTOMAKE([foreign -Wall -Werror])
 AM_SILENT_RULES(yes)
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_HEADERS([config.h])

src/main/c/src/usb4java.c

@@ -34,7 +34,7 @@ jobject NewDirectReadOnlyByteBuffer(JNIEnv *env, const void *mem,
 }
 #pragma GCC diagnostic pop
 
-jint JNI_OnLoad(JavaVM *vm, void *reserved)
+jint JNICALL JNI_OnLoad(JavaVM *vm, void *reserved)
 {
     jvm = vm;
     return JNI_VERSION_1_4;