www-client/lynx: append -D_GNU_SOURCE to CPPFLAGS

Fixes implicit function declarations on glibc systems.

[sam: Add note that it's (likely) a temporary fix until a new development release is made.]

Closes: https://bugs.gentoo.org/918985
Signed-off-by: Christopher Fore <csfore@posteo.net>
Closes: gentoo#34294
Signed-off-by: Sam James <sam@gentoo.org>

www-client/lynx/lynx-2.9.0_pre12-r2.ebuild

@@ -0,0 +1,113 @@
+# Copyright 1999-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+VERIFY_SIG_OPENPGP_KEY_PATH=/usr/share/openpgp-keys/thomasdickey.asc
+inherit verify-sig flag-o-matic
+
+case ${PV} in
+	*_pre*) MY_P="${PN}${PV/_pre/dev.}" ;;
+	*_rc*)  MY_P="${PN}${PV/_rc/pre.}" ;;
+	*_p*|*) MY_P="${PN}${PV/_p/rel.}" ;;
+esac
+
+DESCRIPTION="An excellent console-based web browser with ssl support"
+HOMEPAGE="https://lynx.invisible-island.net/"
+SRC_URI="https://invisible-mirror.net/archives/${PN}/tarballs/${MY_P}.tar.bz2"
+SRC_URI+=" verify-sig? ( https://invisible-mirror.net/archives/${PN}/tarballs/${MY_P}.tar.bz2.asc )"
+S="${WORKDIR}/${MY_P}"
+
+LICENSE="GPL-2"
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~x64-solaris"
+IUSE="brotli bzip2 cjk gnutls idn nls ssl"
+
+RDEPEND="
+	sys-libs/ncurses:=[unicode(+)]
+	sys-libs/zlib
+	brotli? ( app-arch/brotli:= )
+	bzip2? ( app-arch/bzip2 )
+	idn? ( net-dns/libidn2:= )
+	nls? ( virtual/libintl )
+	ssl? (
+		!gnutls? (
+			dev-libs/openssl:=
+		)
+		gnutls? (
+			dev-libs/libgcrypt:=
+			>=net-libs/gnutls-2.6.4:=
+		)
+	)"
+DEPEND="${RDEPEND}"
+BDEPEND="
+	virtual/pkgconfig
+	nls? ( sys-devel/gettext )
+	verify-sig? ( sec-keys/openpgp-keys-thomasdickey )
+"
+
+PATCHES=(
+	"${FILESDIR}/${PN}-2.9.0_pre9-mint.patch"
+	"${FILESDIR}/${PN}-2.9.0_pre9-parallel.patch"
+)
+
+src_configure() {
+	# Temporary fix for bug #918985; seems to be fixed in git but no
+	# development release has yet been made >lynx-2.9.0_pre12. Test if we can
+	# remove this on a newer release.
+	append-cppflags -D_GNU_SOURCE
+
+	local myconf=(
+		--enable-cgi-links
+		--enable-color-style
+		--enable-externs
+		--enable-file-upload
+		--enable-included-msgs
+		--enable-ipv6
+		--enable-nested-tables
+		--enable-nsl-fork
+		--enable-persistent-cookies
+		--enable-prettysrc
+		--enable-read-eta
+		--enable-scrollbar
+		--with-screen=ncursesw
+		--with-zlib
+		$(use_enable cjk)
+		$(use_enable idn idna)
+		$(use_enable nls)
+		$(use_with brotli)
+		$(use_with bzip2 bzlib)
+	)
+
+	if use ssl; then
+		myconf+=(
+			--with-$(usex gnutls gnutls ssl)="${EPREFIX}/usr"
+		)
+	fi
+
+	econf "${myconf[@]}"
+
+	# Compared to openssl gnutls-openssl API does not use
+	# default trust store: bug #604526.
+	sed -e \
+		"s|#define SSL_CERT_FILE NULL|#define SSL_CERT_FILE \"${EPREFIX}/etc/ssl/certs/ca-certificates.crt\"|" \
+		-i userdefs.h || die
+}
+
+src_compile() {
+	# generating translation files in parallel is currently broken
+	use nls && emake -C po -j1
+	emake
+}
+
+src_install() {
+	emake install DESTDIR="${D}"
+
+	sed -i "s|^HELPFILE.*$|HELPFILE:file://localhost/usr/share/doc/${PF}/lynx_help/lynx_help_main.html|" \
+			"${ED}"/etc/lynx.cfg || die "lynx.cfg not found"
+	sed -i '/^#CHARACTER_SET:/ c\CHARACTER_SET:utf-8' \
+			"${ED}"/etc/lynx.cfg || die "lynx.cfg not found"
+
+	dodoc CHANGES COPYHEADER PROBLEMS README
+	dodoc -r docs lynx_help
+}