Add dev-cpp/libgnomecanvasmm

Copied from main gentoo portage tree
where it was removed.

Bug #808375

dev-cpp/libgnomecanvasmm/Manifest

@@ -0,0 +1 @@
+DIST libgnomecanvasmm-2.26.0.tar.bz2 327215 BLAKE2B 87cfc59d0825ad2b345bbeff7ba6ce74744228a359d61c8c6b86cef308827c78410b4633737ab9040f6dbdf7f37ed0ea376d28ab4194266f9c784b8b07d1f76d SHA512 23795c856674b79f82d2e5cffdfdbf67a387fe6a21081fef1d96d0f614a121710c7f1e175612a286f5946a60cea4e8506aef7833a7bdf73084d6266c09aad66b

dev-cpp/libgnomecanvasmm/files/libgnomecanvasmm-2.26.0-disable-building-examples.patch

@@ -0,0 +1,13 @@
+don't waste time building the examples
+
+--- a/Makefile.in
++++ b/Makefile.in
+@@ -195,7 +195,7 @@
+ top_build_prefix = @top_build_prefix@
+ top_builddir = @top_builddir@
+ top_srcdir = @top_srcdir@
+-SUBDIRS = tools libgnomecanvas docs examples demos
++SUBDIRS = tools libgnomecanvas docs demos
+ DIST_SUBDIRS = $(SUBDIRS) scripts 
+ EXTRA_DIST = libgnomecanvasmm.spec.in \
+ 		  build_shared/Makefile_build.am_fragment \

dev-cpp/libgnomecanvasmm/libgnomecanvasmm-2.26.0-r2.ebuild

@@ -0,0 +1,45 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+GNOME_TARBALL_SUFFIX="bz2"
+
+inherit gnome2
+
+DESCRIPTION="C++ bindings for libgnomecanvas"
+HOMEPAGE="https://www.gtkmm.org"
+
+LICENSE="LGPL-2.1"
+SLOT="2.6"
+KEYWORDS="~alpha amd64 arm ~ia64 ppc ppc64 sparc x86"
+IUSE="doc"
+
+RDEPEND="
+	>=gnome-base/libgnomecanvas-2.6
+	>=dev-cpp/gtkmm-2.4:2.4
+"
+DEPEND="${RDEPEND}"
+BDEPEND="
+	virtual/pkgconfig
+	doc? ( app-doc/doxygen )
+"
+
+PATCHES=( "${FILESDIR}"/${P}-disable-building-examples.patch )
+
+src_compile() {
+	gnome2_src_compile
+
+	if use doc; then
+		emake -C docs/reference all
+		HTML_DOCS=( docs/reference/html/. )
+	fi
+}
+
+src_install() {
+	gnome2_src_install
+
+	rm examples/Makefile* examples/*/Makefile* || die
+	dodoc -r examples
+	docompress -x /usr/share/doc/${PF}/examples
+}

dev-cpp/libgnomecanvasmm/metadata.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+<maintainer type="project">
+       <email>nedko@nedk.org</email>
+       <name>Nedko Arnaudov</name>
+</maintainer>
+</pkgmetadata>