If you use geany_git.tar.gz, you must call ./autogen.sh before ./configure (for release tarballs this step is not required).
@eth16, I didn't know this, the point of using the tarball was to save @ralf3u installing autofools, if the nightly tarball needs the full toolset might as well have cloned git, sorry @ralf3u
@ralf3u best to report the strange blank line behaviour to Scintilla as well, it might help narrow down the problem. And looks like Neil thinks you are a developer too, giving you patches to try in Scintilla ;-)