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diff --git a/sci-mathematics/pari/pari-2.15.5.ebuild b/sci-mathematics/pari/pari-2.15.5.ebuild
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+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit flag-o-matic toolchain-funcs
+
+DESCRIPTION="Computer-aided number theory C library and tools"
+HOMEPAGE="https://pari.math.u-bordeaux.fr/"
+SRC_URI="https://pari.math.u-bordeaux.fr/pub/${PN}/unix/${P}.tar.gz"
+
+# Their LICENSE file says "or (at your option) any later version"
+LICENSE="GPL-2+"
+
+# The subslot is the value of $soname_num obtained from
+# upstream's config/version script.
+SLOT="0/8"
+KEYWORDS="~alpha ~amd64 ~arm ~hppa ~mips ~ppc ~ppc64 ~sparc ~x86 ~amd64-linux ~x86-linux"
+IUSE="data doc examples fltk gmp test threads X"
+REQUIRED_USE="fltk? ( !X )" # mutually exclusive plot implementations
+RESTRICT="!test? ( test )"
+
+BDEPEND="
+	virtual/pkgconfig
+	doc? ( virtual/latex-base )
+"
+DEPEND="
+	sys-libs/readline:0=
+	data? ( sci-mathematics/pari-data )
+	doc? ( X? ( x11-misc/xdg-utils ) )
+	fltk? ( x11-libs/fltk:1= )
+	gmp? ( dev-libs/gmp:0= )
+	X? ( x11-libs/libX11:0= )"
+RDEPEND="${DEPEND}"
+
+src_prepare() {
+	default
+
+	# move doc dir to a gentoo doc dir and replace acroread by xdg-open
+	sed -i \
+		-e "s:\$d = \$0:\$d = '${EPREFIX}/usr/share/doc/${PF}':" \
+		-e 's:"acroread":"xdg-open":' \
+		doc/gphelp.in || die "Failed to fix doc dir"
+
+	# These tests fail when LaTeX is not installed (which we don't
+	# require without USE=doc), most likely due to output formatting
+	# issues but I haven't deleted my LaTeX installation to check.
+	# There's no real upstream support for enabling/disabling the LaTeX
+	# docs, so this is probably the correctest way to skip these tests.
+	if ! use doc; then
+		rm src/test/{in,32}/help || die
+	fi
+}
+
+src_configure() {
+	tc-export CC CXX PKG_CONFIG
+
+	# Workaraound to "asm operand has impossible constraints" as
+	# suggested in bug #499996.
+	use x86 && append-cflags $(test-flags-CC -fno-stack-check)
+
+	# sysdatadir installs a pari.cfg stuff which is informative only.
+	# It is supposed to be for "architecture-dependent" data.  It needs
+	# to be easily discoverable for downstream packages such as gp2c.
+	# We set LD="" and DLLD="$CC" so that the "shared library linker"
+	# always gets set to the value of the compiler used. Pari's build
+	# system does not cope very well with a naked linker, it is
+	# expecting a compiler driver. See bugs 722090 and 871117.
+	# DLLDFLAGS, on the other hand, is used exactly like LDFLAGS would
+	# be in a less-weird build system.
+	#
+	# There's a lot of automagic involved in the graphics detection.  We
+	# first pass --graphic=none, which disables some of it. We then pass
+	# --graphic=fltk (or --graphic=X11) only if USE=fltk (or USE=X) is
+	# set. This is a stronger hint to the build system than --with-fltk
+	# would be, and importantly does not rely on the corresponding but
+	# nonexistent(!) option option for X11.
+	LD="" DLLD="$(tc-getCC)" DLLDFLAGS="${LDFLAGS}" ./Configure \
+		--prefix="${EPREFIX}"/usr \
+		--datadir="${EPREFIX}/usr/share/${PN}" \
+		--libdir="${EPREFIX}/usr/$(get_libdir)" \
+		--sysdatadir="${EPREFIX}"/usr/share/pari \
+		--mandir="${EPREFIX}"/usr/share/man/man1 \
+		--with-readline="${EPREFIX}"/usr \
+		--with-readline-lib="${EPREFIX}/usr/$(get_libdir)" \
+		--with-ncurses-lib="${EPREFIX}/usr/$(get_libdir)" \
+		--graphic=none \
+		$(usex X --graphic=X11 "" "" "") \
+		$(usex fltk --graphic=fltk "" "" "") \
+		$(use_with gmp) \
+		$(usex threads "--mt=pthread" "" "" "") \
+		|| die "./Configure failed"
+}
+
+src_compile() {
+	emake gp
+
+	if use doc; then
+		# To prevent sandbox violations by metafont
+		VARTEXFONTS="${T}/fonts" emake docpdf
+	fi
+}
+
+src_test() {
+	# Welcome to the jungle, where the tests fail if you make your
+	# terminal bigger.
+	emake COLUMNS=80 test-all
+}
+
+src_install() {
+	DOCS=( AUTHORS CHANGES* COMPAT NEW README* )
+
+	# Install examples to a junk location by default because "make
+	# install-nodata" includes the examples with it. Only if the user
+	# has USE=examples set do we provide the correct directory.
+	local exdir="${T}"
+	if use examples; then
+		docompress -x "/usr/share/doc/${PF}/examples"
+		exdir="${ED}/usr/share/doc/${PF}/examples"
+	fi
+
+	# Use "true" in place of "strip" to sabotage the unconditional
+	# binary stripping.
+	emake DESTDIR="${D}" \
+		  EXDIR="${exdir}" \
+		  STRIP="true" \
+		  install-nodata install-data
+	einstalldocs
+
+	if use doc; then
+		docompress -x "/usr/share/doc/${PF}"
+		emake \
+			DESTDIR="${D}" \
+			DOCDIR="${ED}/usr/share/doc/${PF}" \
+			install-docpdf install-doctex
+	fi
+}