If conserving disk space is an issue, you can delete the directories used during the build procedure. The directories that can be safely removed are:
D:cygwinsrcinutils
D:cygwinsrcgcc
D:cygwinsrcgdb
The following directories can also be deleted; however, it might be useful to save the configure and make output files generated during the build:
D:cygwin mpuildinutils
D:cygwin mpuildgcc
D:cygwin mpuildgdb
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