Error: no such instruction: `eor %edx,%r15d,%r15d,ror'

Hi... I m trying to install osmocom-bb using following link: http://bb.osmocom.org/trac/wiki/Software/GettingStarted First of all i installed the Dependencies for the host. Then for target dependencies, i build my own toolchain using following: http://bb.osmocom.org/trac/wiki/GnuArmToolchain This toolchain building processes ended up saying: "Build complete! Add /home/arslan/dir/install/bin to your PATH to make arm-elf-gcc and friends accessible directly." (i don't know building my own toolchain is necessary or not). Then i went back for building osmocom-bb There i came across getting and updating the source. But in building the source section, what it says is: " Compiling both the target and the host code will happen with the following command. It assumes that the *arm-elf-gcc* is* inside the current path.*" I didn't understand it as my current path is osmocom-bb and there is no arm-elf-gcc Can anyone tell me what does it mean? Anyways, i just ignored it and went on executing the following command cd src/ make So i ended up with an error saying: /home/arslan/osmocom-bb/src/target/firmware/include/asm/swab.h:32: Error: no such instruction: `eor %edx,%r15d,%r15d,ror' make[4]: *** [gsmtap_util.lo] Error 1 I tried to figure it out from Internet. It really didn't work out. M stuck at this point. Can anyone help me resolving this problem?