Hello. galculator 2.1.4 was released at 2015-09-05. Since its official homepage is moved, HOMEPAGE="http://galculator.mnim.org/" SRC_URI="http://galculator.mnim.org/downloads/${P}.tar.bz2" are right. By the way, although galculator can be built for GTK+:2 as well as GTK+:3, the ebuild files aren't support to build with GTK+:2 now. To support GTK+:2 build, IUSE, RDEPEND and src_configure should be modified. thanks,
Also, Its repository (and issues) is moved from SourceForge to GitHub, remote-id in metadata.xml should be updated like this <remote-id type="github">galculator/galculator</remote-id>
[master 1974c60] sci-calculators/galculator: Version bump (#564300 by Mika Kobayashi) 3 files changed, 33 insertions(+), 1 deletion(-) create mode 100644 sci-calculators/galculator/galculator-2.1.4.ebuild