--- /dev/null
+--- a/src/gnat/gnat_config.ml 2017-10-18 09:07:03.118919785 +0200
++++ b/src/gnat/gnat_config.ml 2017-10-18 09:07:45.198216939 +0200
+@@ -12,10 +12,7 @@
+ | Limit_Check of Gnat_expl.check
+ | Limit_Line of Gnat_loc.loc
+
+-let spark_prefix =
+- (Filename.dirname
+- (Filename.dirname (Filename.dirname
+- (Filename.dirname Sys.executable_name))))
++let spark_prefix = "/usr"
+
+ let rec file_concat l =
+ match l with
--- /dev/null
+# Copyright 1999-2019 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+
+inherit autotools
+
+MYP=why3-${PV}-20190517-197BB-src
+
+DESCRIPTION="Platform for deductive program verification"
+HOMEPAGE="http://why3.lri.fr/"
+SRC_URI="http://mirrors.cdn.adacore.com/art/5cdf915d31e87a8f1c967d54
+ -> ${MYP}.tar.gz"
+
+LICENSE="GPL-3"
+SLOT="0"
+KEYWORDS="~amd64"
+IUSE="coq doc emacs gtk html hypothesis-selection +ocamlopt profiling zarith zip"
+RESTRICT=strip
+
+DEPEND=">=dev-lang/ocaml-4.02.3[ocamlopt?]
+ dev-ml/menhir
+ coq? ( sci-mathematics/coq )
+ doc? ( dev-tex/rubber )
+ gtk? ( dev-ml/lablgtk[sourceview] )
+ emacs? ( virtual/emacs )
+ html? ( dev-tex/hevea )
+ hypothesis-selection? ( dev-ml/ocamlgraph )
+ zarith? ( dev-ml/zarith )
+ zip? ( >=dev-ml/camlzip-1.07 )"
+RDEPEND="${DEPEND}"
+
+S="${WORKDIR}"/${MYP}
+
+PATCHES=( "${FILESDIR}"/${P}-gentoo.patch )
+
+REQUIRED_USE="html? ( doc )"
+
+src_configure() {
+ econf \
+ --disable-pvs-libs \
+ --disable-isabelle-libs \
+ --enable-verbose-make \
+ $(use_enable coq coq-libs) \
+ $(use_enable doc) \
+ $(use_enable emacs emacs-compilation) \
+ $(use_enable gtk ide) \
+ $(use_enable html html-doc) \
+ $(use_enable hypothesis-selection) \
+ $(use_enable ocamlopt native-code) \
+ $(use_enable profiling) \
+ $(use_enable zarith) \
+ $(use_enable zip)
+}
+
+src_compile() {
+ emake -j1
+ if use ocamlopt; then
+ emake byte
+ fi
+ use doc && emake doc
+}
+
+src_install() {
+ emake DESTDIR="${D}" -j1 install
+ emake DESTDIR="${D}" -j1 install-lib
+ emake DESTDIR="${D}" install_spark2014_dev
+ dosym ../why3server /usr/$(get_libdir)/why3/commands/why3server
+ einstalldocs
+ docompress -x /usr/share/doc/${PF}/examples
+ dodoc -r examples
+ if use doc; then
+ dodoc doc/manual.pdf
+ use html && dodoc -r doc/html
+ fi
+}