Please see the report that you requested and give your suggestions.
(I am posting this message again after changing the subject title. Previously it was “ rejected posting...”).
Thanks
RB
$ $FSLDIR/etc/fslconf/fslmachtype.sh
gnu_64-gcc4.8
$ ls $FSLDIR/config/$FSLMACHTYPE
apple-darwin10-gcc4.2 common linux_32-gcc4.1
apple-darwin12-gcc4.2 generic linux_64-gcc4.0
apple-darwin12-llvm4.0 gnu_64-gcc4.4 linux_64-gcc4.1
apple-darwin12-llvm5.0 i686-pc-cygwin-gcc3.2 linux_64-gcc4.2
apple-darwin13-llvm5.0 i686-pc-cygwin-gcc3.3 linux_64-gcc4.4
apple-darwin13-llvm5.1 i686-pc-cygwin-gcc3.4 linux_64-gcc4.8
apple-darwin13-llvm6.0 linux_32-gcc2.96 Makefile
apple-darwin7-gcc3.1 linux_32-gcc3.2 sparc-solaris2.8-gcc2.95
apple-darwin7-gcc3.3 linux_32-gcc3.3 sparc-solaris2.9-gcc2.95
apple-darwin8-gcc4.0 linux_32-gcc3.4
apple-darwin9-gcc4.0 linux_32-gcc4.0
$ dpkg -l | grep gcc
ii gcc 4:7.2.0-1ubuntu1 amd64 GNU C compiler
ii gcc-4.8 4.8.5-4ubuntu6 amd64 GNU C compiler
ii gcc-4.8-base:amd64 4.8.5-4ubuntu6 amd64 GCC, the GNU Compiler Collection (base package)
ii gcc-7 7.2.0-8ubuntu3.2 amd64 GNU C compiler
ii gcc-7-base:amd64 7.2.0-8ubuntu3.2 amd64 GCC, the GNU Compiler Collection (base package)
ii gcc-7-base:i386 7.2.0-8ubuntu3.2 i386 GCC, the GNU Compiler Collection (base package)
ii lib32gcc1 1:7.2.0-8ubuntu3.2 amd64 GCC support library (32 bit Version)
ii libcaca0:amd64 0.99.beta19-2build2~gcc5.2 amd64 colour ASCII art library
ii libgcc-4.8-dev:amd64 4.8.5-4ubuntu6 amd64 GCC support library (development files)
ii libgcc-7-dev:amd64 7.2.0-8ubuntu3.2 amd64 GCC support library (development files)
ii libgcc1:amd64 1:7.2.0-8ubuntu3.2 amd64 GCC support library
ii libgcc1:i386 1:7.2.0-8ubuntu3.2 i386 GCC support library