gcc

$ cygcheck -c bash binutils bzip2 cygwin gcc4-core\
>   gcc4-g++ gzip m4 make unzip zip
Cygwin Package Information
Package              Version        Status
bash                 4.1.17-9       OK
binutils             2.25-1         OK
bzip2                1.0.6-2        OK
cygwin               1.7.34-6       OK
gzip                 1.6-1          OK
m4                   1.4.17-1       OK
make                 4.0-2          OK
unzip                6.0-13         OK