diff --git a/dev-embedded/gpsim/Manifest b/dev-embedded/gpsim/Manifest
new file mode 100644
index 0000000..3d9d4b8
--- /dev/null
+++ b/dev-embedded/gpsim/Manifest
@@ -0,0 +1,3 @@
+DIST gpsim-0.31.0.tar.gz 3454179 BLAKE2B 449f891c7a765ce06da87c8de1a8adc0d7e15c9af175fc2988d604660108c14cc816247358a71bbb55813c5144f6973c01d3c9c27c44f2a45820b85cedc97d2c SHA512 a6af7e9170cee11c35f0e4731d39876e563edd8ca9cbd0f4b3017f224e5317b4c8bcc8aa4468102fa5c11157f487b6c7354e3aba8778842ed0b5be9bbb9ef45f
+EBUILD gpsim-0.31.0.ebuild 955 BLAKE2B 7ae00791751b242603a8ef1ad765c546c0bbd77c7b8abc1a4b49df856095a7aac7b24aecb574482a226ce3905cda27ef2d2c7e20caa2c778d8f16ff3775eb58f SHA512 ca2483aa7c51f84bb7fb0bc1a5ec717eee4dfaba7dd3b9c12b35bedd1415210cb87a2b9d15bfa0327b50ca9b3cb8180f1848c8b01a7b32dbabae20fb9c932c0b
+EBUILD gpsim-9999.ebuild 1134 BLAKE2B 1cf20deca03cfdf1cd52b748be12b895970ac6352b3a59e1ecdf715d10f811540980a963c46292c1a14a70a21ddc75aa364408a39d50a4eccd47f905606dcb11 SHA512 b5f9108f282050476373e3ef00d6d3c868f8dbcbc3513934f63c35e436de4e366a4ad1d09b0639b60a2e81560560bad0f61a1f47ad509f001da129ddadea6e63
diff --git a/dev-embedded/gpsim/gpsim-0.31.0.ebuild b/dev-embedded/gpsim/gpsim-0.31.0.ebuild
new file mode 100644
index 0000000..d774e25
--- /dev/null
+++ b/dev-embedded/gpsim/gpsim-0.31.0.ebuild
@@ -0,0 +1,45 @@
+# Copyright 1999-2020 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+inherit ltprune
+
+if [[ ${PV} == "9999" ]] ; then
+        inherit subversion
+	ESVN_REPO_URI="https://svn.code.sf.net/p/gpsim/code/trunk"
+else
+	SRC_URI="mirror://sourceforge/${PN}/${P}.tar.gz"
+	KEYWORDS="~amd64 ~ppc ~ppc64 ~x86"
+fi
+
+
+DESCRIPTION="A simulator for the Microchip PIC microcontrollers"
+HOMEPAGE="http://gpsim.sourceforge.net"
+
+LICENSE="GPL-2"
+SLOT="0"
+IUSE="doc gtk static-libs"
+
+RDEPEND=">=dev-embedded/gputils-0.12
+	dev-libs/glib:2
+	dev-libs/popt
+	sys-libs/readline:0=
+	gtk? ( >=x11-libs/gtk+extra-2 )"
+DEPEND="${RDEPEND}
+	sys-devel/flex
+	virtual/pkgconfig
+	virtual/yacc"
+
+DOCS=( ANNOUNCE AUTHORS ChangeLog HISTORY PROCESSORS README README.MODULES TODO )
+
+src_configure() {
+	econf \
+		$(use_enable gtk gui) \
+		$(use_enable static-libs static)
+}
+
+src_install() {
+	default
+	use doc && dodoc doc/gpsim.pdf
+	prune_libtool_files
+}
diff --git a/dev-embedded/gpsim/gpsim-9999.ebuild b/dev-embedded/gpsim/gpsim-9999.ebuild
new file mode 100644
index 0000000..74c0650
--- /dev/null
+++ b/dev-embedded/gpsim/gpsim-9999.ebuild
@@ -0,0 +1,56 @@
+# Copyright 1999-2020 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+inherit ltprune
+
+if [[ ${PV} == "9999" ]] ; then
+        inherit autotools subversion
+	ESVN_REPO_URI="https://svn.code.sf.net/p/gpsim/code/trunk"
+else
+	SRC_URI="mirror://sourceforge/${PN}/${P}.tar.gz"
+	KEYWORDS="~amd64 ~ppc ~ppc64 ~x86"
+fi
+
+
+DESCRIPTION="A simulator for the Microchip PIC microcontrollers"
+HOMEPAGE="http://gpsim.sourceforge.net"
+
+LICENSE="GPL-2"
+SLOT="0"
+IUSE="doc gtk static-libs"
+
+RDEPEND=">=dev-embedded/gputils-0.12
+	dev-libs/glib:2
+	dev-libs/popt
+	sys-libs/readline:0=
+	gtk? ( >=x11-libs/gtk+extra-2 )"
+DEPEND="${RDEPEND}
+	sys-devel/flex
+	virtual/pkgconfig
+	virtual/yacc"
+
+DOCS=( ANNOUNCE AUTHORS ChangeLog HISTORY PROCESSORS README README.MODULES TODO )
+
+src_prepare() {
+	default
+
+	if [[ ${PV} == "9999" ]] ; then
+		eautoreconf
+	fi
+}
+
+src_configure() {
+	econf \
+		--enable-leak-sanitize \
+		--enable-address-sanitize \
+		--enable-undefined-sanitize \
+		$(use_enable gtk gui) \
+		$(use_enable static-libs static)
+}
+
+src_install() {
+	default
+	use doc && dodoc doc/gpsim.pdf
+	prune_libtool_files
+}