More info:
gcc-4.6-base only exists in wheezy: https://packages.qa.debian.org/g/gcc-4.6.html
gcc-4.7-base only exists in wheezy (and sid): https://packages.qa.debian.org/g/gcc-4.7.html
mountall is not needed: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=810673
xz-utils is not really required: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=685203
More info:
gcc-4.6-base only exists in wheezy: https:/ /packages. qa.debian. org/g/gcc- 4.6.html
gcc-4.7-base only exists in wheezy (and sid): https:/ /packages. qa.debian. org/g/gcc- 4.7.html
mountall is not needed: https:/ /bugs.debian. org/cgi- bin/bugreport. cgi?bug= 810673
xz-utils is not really required: https:/ /bugs.debian. org/cgi- bin/bugreport. cgi?bug= 685203