Hi, I am trying to compile one C++ code using g++. I am getting error of declaration conflict since GCC(g++) is finding 2 Declarations of jboolean; one in gcc's own header file and another in jni.h (Java Native Interface) /opt/jdk1.5/include/jni.h:39: error: conflicting declaration ?typedef unsigned char jboolean? /usr/lib/gcc/x86_64-redhat-linux/4.1.1/include/jni_md.h:84: error: ?jboolean? has a previous declaration as ?typedef signed char jboolean? The file jni.h has the following declaration:- typedef unsigned char jboolean; Whereas in the file jni_md.h there is following declaration(s):- typedef int jboolean __attribute__((__mode__(__QI__))); typedef int8_t jboolean; Anyone has any idea why it could be causing? The very source code being used here works fine on other platforms/compilers. How to get away with this error? I am using GCC 4.1.1. And my OS is Linux(RH5) AMD-64bit platform. Thanks, -Dhiraj