On 23 January 2012 15:05, abhishek goswami wrote: > > > Hi, >> Please find the g++ info. I do not have permission to install 64bit gcc. >> is it possible that can we compile in 32bit machine. > and another important thing why do we need m64 . Can I ignore this > option?(Sorry I do not have much info). I assume Qt is detecting that you are using a 64-bit machine, so is configuring for a 64-bit build. You either need a 64-bit compiler, or you need to configure Qt for a 32-bit build. I don't know how to configure Qt like that, you should probably ask in a Qt forum. >> >> g++ -v >> Using built-in specs. >> Target: i386-redhat-linux >> Configured with: ../configure --prefix=/usr --mandir=/usr/share/man >> --infodir=/usr/share/info --enable-shared --enable-threads=posix >> --enable-checking=release --with-system-zlib --enable-__cxa_atexit >> --disable-libunwind-exceptions --enable-libgcj-multifile >> --enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk >> --disable-dssi --enable-plugin >> --with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --with-cpu=generic >> --host=i386-redhat-linux >> Thread model: posix >> gcc version 4.1.2 20080704 (Red Hat 4.1.2-48) >> >> >> ________________________________________ >> From: Jonathan Wakely [jwakely.gcc@xxxxxxxxx] >> Sent: Monday, January 23, 2012 5:46 AM >> To: Goswami, Abhishek >> Cc: gcc-help@xxxxxxxxxxx >> Subject: Re: Regarding gcc compile >> >> On 23 January 2012 10:20, Goswami, Abhishek wrote: >>> sorry, unimplemented: 64-bit mode not compiled in >> >> It looks as though you have installed a 32-bit version of GCC that >> doesn't support the -m64 option. >> >> What is the output of 'g++ -v' ? > >