svn propset svn:ignore build . // Ignores the build folder.
svn propedit svn:ignore . // Opens an editor.

$ git svn
blame           -- show what revision and author last modified each line of a file:
branch          -- create a branch in the SVN repository
clone           -- same as init, followed by fetch
commit-diff     -- commit diff of two tree-ishs
create-ignore   -- recursively finds the svn:ignore property and creates .gitignore files
dcommit         -- commit diffs from given head onto SVN repository
fetch           -- fetch revisions from the SVN remote
find-rev        -- output git commit corresponding to the given SVN revision's hash
info            -- show information about a file or directory
init            -- initialize an empty git repository with additional svn data
log             -- output SVN log-messages
propget         -- get a given SVN property for a file
proplist        -- list the SVN properties stored for a file or directory
rebase          -- fetch revs from SVN parent of HEAD and rebase current work on it
set-tree        -- commit given commit or tree to SVN repository
show-externals  -- show the subversion externals
show-ignore     -- output corresponding toplevel .gitignore file of svn:ignore
tag             -- create a tag in the SVN repository