diff --git a/sci-electronics/pcb2gcode/Manifest b/sci-electronics/pcb2gcode/Manifest
index 2d6dd4d..1c091a6 100644
--- a/sci-electronics/pcb2gcode/Manifest
+++ b/sci-electronics/pcb2gcode/Manifest
@@ -1 +1,2 @@
-EBUILD pcb2gcode-9999.ebuild 1045 BLAKE2B a4785bd2fbe01259704afa2a57726f98d49c0d36ca9b216c504429167db79c794edd37c9438f256e78fde74f8dcd7c8102bca37e1ed16d5a48311e6a09aab56c SHA512 5f7a3e983a34652b432583ecebf6d730f4c83f276b25fc8ff06b8ccf9f2d6a9d9c697977c822dc85cd3a049fca5a109a6fc7ab2e325b0ea59a1f0ead6dc9485a
+AUX pcb2gcode-9999-gcc-11.patch 16034 BLAKE2B 112322dac10529fb51217d237be144c55800ccc642e8d56212f7e4a2355be1af9ef90bea2e3b14e8c5b5d3074433284d0a8e755cfc809bca3f84e4b8ef36d78b SHA512 3cc777212f45ad0c4d489feb90f5ec2f46d1e67f5f231d034dc695464dfd8adaefd0533431cfaf7828c8071a67261415de992f338aac7b3f25936ad0f25389fa
+EBUILD pcb2gcode-9999.ebuild 1086 BLAKE2B b87dfb99fcef6d23556458e8946dcd0ae9046974f3d396d6a597786ae7f5787991c4638be4f9cfba94e4aa766b2c1c59bfc5a4a04f84bc044d2973452cc9a2d8 SHA512 b020d07d2e8705ab748e22929d2d016e3d5137fa04f74e17631e34c1e308a8e5ee464152d1248868ba54e01aa87221801eb82d1d50757e639b095fe72410756f
diff --git a/sci-electronics/pcb2gcode/files/pcb2gcode-9999-gcc-11.patch b/sci-electronics/pcb2gcode/files/pcb2gcode-9999-gcc-11.patch
new file mode 100644
index 0000000..aef8e30
--- /dev/null
+++ b/sci-electronics/pcb2gcode/files/pcb2gcode-9999-gcc-11.patch
@@ -0,0 +1,330 @@
+diff -urN pcb2gcode-9999.orig/path_finding.cpp pcb2gcode-9999/path_finding.cpp
+--- pcb2gcode-9999.orig/path_finding.cpp	2021-05-19 10:04:48.238921433 +0200
++++ pcb2gcode-9999/path_finding.cpp	2021-05-19 10:10:38.227035983 +0200
+@@ -28,7 +28,7 @@
+ namespace path_finding {
+ 
+ using boost::optional;
+-using boost::make_optional;
++//using boost::make_optional;
+ 
+ Neighbors::iterator Neighbors::iterator::operator++() {
+   const auto& all_vertices_size = neighbors->vertices.size();
+@@ -440,7 +440,7 @@
+     open_set.pop();
+     if (current == goal) {
+       // We're done.
+-      return make_optional(build_path(current, came_from));
++      return boost::make_optional(build_path(current, came_from));
+     }
+     if (closed_set.count(current) > 0) {
+       // Skip this because we already "removed it", sort of.
+diff -urN pcb2gcode-9999.orig/path_finding_tests.cpp pcb2gcode-9999/path_finding_tests.cpp
+--- pcb2gcode-9999.orig/path_finding_tests.cpp	2021-05-19 10:04:48.239921443 +0200
++++ pcb2gcode-9999/path_finding_tests.cpp	2021-05-19 10:10:24.618914885 +0200
+@@ -7,7 +7,7 @@
+ #include "bg_helpers.hpp"
+ 
+ #include <boost/optional.hpp>
+-using boost::make_optional;
++//using boost::make_optional;
+ 
+ #include <boost/optional/optional_io.hpp>
+ 
+@@ -126,7 +126,7 @@
+   multi_polygon_type_fp mp;
+   box_type_fp box{point_type_fp{0,0}, {10,10}};
+   bg::convert(box, mp);
+-  BOOST_CHECK_EQUAL(inside_multipolygon(point_type_fp{1,1}, mp), make_optional(MPRingIndices({{0, {0}}})));
++  BOOST_CHECK_EQUAL(inside_multipolygon(point_type_fp{1,1}, mp), boost::make_optional(MPRingIndices({{0, {0}}})));
+   BOOST_CHECK_EQUAL(inside_multipolygon(point_type_fp{11,11}, mp), boost::none);
+ }
+ 
+@@ -149,10 +149,10 @@
+   bg::convert(hole, hole_mp);
+   mp = mp - hole_mp;
+ 
+-  BOOST_CHECK_EQUAL(inside_multipolygon(point_type_fp{1,1}, mp), make_optional(MPRingIndices({{0, {0, 1}}})));
++  BOOST_CHECK_EQUAL(inside_multipolygon(point_type_fp{1,1}, mp), boost::make_optional(MPRingIndices({{0, {0, 1}}})));
+   BOOST_CHECK_EQUAL(inside_multipolygon(point_type_fp{11,11}, mp), boost::none);
+   BOOST_CHECK_EQUAL(inside_multipolygon(point_type_fp{5,5}, mp), boost::none);
+-  BOOST_CHECK_EQUAL(inside_multipolygon(point_type_fp{21,1}, mp), make_optional(MPRingIndices({{1, {0, 1, 2}}})));
++  BOOST_CHECK_EQUAL(inside_multipolygon(point_type_fp{21,1}, mp), boost::make_optional(MPRingIndices({{1, {0, 1, 2}}})));
+   BOOST_CHECK_EQUAL(inside_multipolygon(point_type_fp{23.5,3.5}, mp), boost::none);
+ }
+ 
+@@ -171,9 +171,9 @@
+   hole = {point_type_fp{30,30}, {70,70}};
+   bg::convert(hole, hole_mp);
+   mp = mp - hole_mp;
+-  BOOST_CHECK_EQUAL(inside_multipolygon(point_type_fp{1,1}, mp), make_optional(MPRingIndices({{0, {0, 1}}})));
++  BOOST_CHECK_EQUAL(inside_multipolygon(point_type_fp{1,1}, mp), boost::make_optional(MPRingIndices({{0, {0, 1}}})));
+   BOOST_CHECK_EQUAL(inside_multipolygon(point_type_fp{11,11}, mp), boost::none);
+-  BOOST_CHECK_EQUAL(inside_multipolygon(point_type_fp{21,21}, mp), make_optional(MPRingIndices({{1, {0, 1}}})));
++  BOOST_CHECK_EQUAL(inside_multipolygon(point_type_fp{21,21}, mp), boost::make_optional(MPRingIndices({{1, {0, 1}}})));
+   BOOST_CHECK_EQUAL(inside_multipolygon(point_type_fp{31,31}, mp), boost::none);
+ }
+ 
+@@ -190,7 +190,7 @@
+   box_type_fp box{point_type_fp{0,0}, {10,10}};
+   bg::convert(box, mp);
+   BOOST_CHECK_EQUAL(outside_multipolygon(point_type_fp{1,1}, mp), boost::none);
+-  BOOST_CHECK_EQUAL(outside_multipolygon(point_type_fp{11,11}, mp), make_optional(MPRingIndices({{0, {0}}})));
++  BOOST_CHECK_EQUAL(outside_multipolygon(point_type_fp{11,11}, mp), boost::make_optional(MPRingIndices({{0, {0}}})));
+ }
+ 
+ BOOST_AUTO_TEST_CASE(doughnuts) {
+@@ -213,10 +213,10 @@
+   mp = mp - hole_mp;
+ 
+   BOOST_CHECK_EQUAL(outside_multipolygon(point_type_fp{1,1}, mp), boost::none);
+-  BOOST_CHECK_EQUAL(outside_multipolygon(point_type_fp{11,11}, mp), make_optional(MPRingIndices({{0, {0}}, {1, {0}}})));
+-  BOOST_CHECK_EQUAL(outside_multipolygon(point_type_fp{5,5}, mp), make_optional(MPRingIndices({{0, {1}}, {1, {0}}})));
++  BOOST_CHECK_EQUAL(outside_multipolygon(point_type_fp{11,11}, mp), boost::make_optional(MPRingIndices({{0, {0}}, {1, {0}}})));
++  BOOST_CHECK_EQUAL(outside_multipolygon(point_type_fp{5,5}, mp), boost::make_optional(MPRingIndices({{0, {1}}, {1, {0}}})));
+   BOOST_CHECK_EQUAL(outside_multipolygon(point_type_fp{21,1}, mp), boost::none);
+-  BOOST_CHECK_EQUAL(outside_multipolygon(point_type_fp{23.5,3.5}, mp), make_optional(MPRingIndices({{0, {0}}, {1, {1}}})));
++  BOOST_CHECK_EQUAL(outside_multipolygon(point_type_fp{23.5,3.5}, mp), boost::make_optional(MPRingIndices({{0, {0}}, {1, {1}}})));
+ }
+ 
+ BOOST_AUTO_TEST_CASE(nested_doughnuts) {
+@@ -236,9 +236,9 @@
+   mp = mp - hole_mp;
+ 
+   BOOST_CHECK_EQUAL(outside_multipolygon(point_type_fp{1,1}, mp), boost::none);
+-  BOOST_CHECK_EQUAL(outside_multipolygon(point_type_fp{11,11}, mp), make_optional(MPRingIndices({{0, {1}}, {1, {0}}})));
++  BOOST_CHECK_EQUAL(outside_multipolygon(point_type_fp{11,11}, mp), boost::make_optional(MPRingIndices({{0, {1}}, {1, {0}}})));
+   BOOST_CHECK_EQUAL(outside_multipolygon(point_type_fp{21,21}, mp), boost::none);
+-  BOOST_CHECK_EQUAL(outside_multipolygon(point_type_fp{31,31}, mp), make_optional(MPRingIndices({{0, {1}}, {1, {1}}})));
++  BOOST_CHECK_EQUAL(outside_multipolygon(point_type_fp{31,31}, mp), boost::make_optional(MPRingIndices({{0, {1}}, {1, {1}}})));
+ }
+ 
+ BOOST_AUTO_TEST_SUITE_END() // outside_multipolygon_tests
+@@ -247,16 +247,16 @@
+ 
+ BOOST_AUTO_TEST_CASE(open_space) {
+   auto surface = PathFindingSurface(boost::none, multi_polygon_type_fp(), 5);
+-  BOOST_CHECK_EQUAL(surface.in_surface({1,1}), make_optional(size_t(0)));
++  BOOST_CHECK_EQUAL(surface.in_surface({1,1}), boost::make_optional(size_t(0)));
+ }
+ 
+ BOOST_AUTO_TEST_CASE(barbell) {
+   multi_polygon_type_fp barbell{{{{0,0}, {0,100}, {40,100}, {40,2}, {60,2},
+                                   {60,100}, {100,100}, {100,0}, {0,0}}}};
+   auto surface = PathFindingSurface(boost::none, barbell, 5);
+-  BOOST_CHECK_EQUAL(surface.in_surface({1,1}), make_optional(size_t(0)));
++  BOOST_CHECK_EQUAL(surface.in_surface({1,1}), boost::make_optional(size_t(0)));
+   BOOST_CHECK_EQUAL(surface.in_surface({6,6}), boost::none);
+-  BOOST_CHECK_EQUAL(surface.in_surface({-10,-10}), make_optional(size_t(0)));
++  BOOST_CHECK_EQUAL(surface.in_surface({-10,-10}), boost::make_optional(size_t(0)));
+   BOOST_CHECK_EQUAL(surface.in_surface({10,10}), boost::none);
+ }
+ 
+@@ -266,12 +266,12 @@
+                                           {51,80}, {51,100}, {100,100},
+                                           {100,0}, {0,0}}}};
+   auto surface = PathFindingSurface(almost_doughnut, multi_polygon_type_fp(), 5);
+-  BOOST_CHECK_EQUAL(surface.in_surface({1,1}), make_optional(size_t(0)));
+-  BOOST_CHECK_EQUAL(surface.in_surface({6,6}), make_optional(size_t(0)));
++  BOOST_CHECK_EQUAL(surface.in_surface({1,1}), boost::make_optional(size_t(0)));
++  BOOST_CHECK_EQUAL(surface.in_surface({6,6}), boost::make_optional(size_t(0)));
+   BOOST_CHECK_EQUAL(surface.in_surface({-10,-10}), boost::none);
+-  BOOST_CHECK_EQUAL(surface.in_surface({50,1}), make_optional(size_t(0)));
++  BOOST_CHECK_EQUAL(surface.in_surface({50,1}), boost::make_optional(size_t(0)));
+   BOOST_CHECK_EQUAL(surface.in_surface({50,50}), boost::none);
+-  BOOST_CHECK_EQUAL(surface.in_surface({50,90}), make_optional(size_t(0)));
++  BOOST_CHECK_EQUAL(surface.in_surface({50,90}), boost::make_optional(size_t(0)));
+ }
+ 
+ BOOST_AUTO_TEST_SUITE_END() // nested_multipolygon_type_fp
+@@ -285,7 +285,7 @@
+   linestring_type_fp expected;
+   expected.push_back(point_type_fp(0, 0));
+   expected.push_back(point_type_fp(1, 1));
+-  BOOST_CHECK_EQUAL(ret, make_optional(expected));
++  BOOST_CHECK_EQUAL(ret, boost::make_optional(expected));
+ }
+ 
+ BOOST_AUTO_TEST_CASE(simple) {
+@@ -299,7 +299,7 @@
+   linestring_type_fp expected;
+   expected.push_back(point_type_fp(0, 0));
+   expected.push_back(point_type_fp(1, 1));
+-  BOOST_CHECK_EQUAL(ret, make_optional(expected));
++  BOOST_CHECK_EQUAL(ret, boost::make_optional(expected));
+ }
+ 
+ BOOST_AUTO_TEST_CASE(simple_limit0) {
+@@ -309,7 +309,7 @@
+   bg::convert(bounding_box, keep_in);
+   auto surface = PathFindingSurface(keep_in, multi_polygon_type_fp(), 0.1);
+   auto ret = surface.find_path(point_type_fp(0,0), point_type_fp(1,1),
+-                               infinity, make_optional(size_t(0)));
++                               infinity, boost::make_optional(size_t(0)));
+   BOOST_CHECK_EQUAL(ret, boost::none);
+ }
+ 
+@@ -320,11 +320,11 @@
+   bg::convert(bounding_box, keep_in);
+   auto surface = PathFindingSurface(keep_in, multi_polygon_type_fp(), 0.1);
+   auto ret = surface.find_path(point_type_fp(0,0), point_type_fp(1,1),
+-                               infinity, make_optional(size_t(1)));
++                               infinity, boost::make_optional(size_t(1)));
+   linestring_type_fp expected;
+   expected.push_back(point_type_fp(0, 0));
+   expected.push_back(point_type_fp(1, 1));
+-  BOOST_CHECK_EQUAL(ret, make_optional(expected));
++  BOOST_CHECK_EQUAL(ret, boost::make_optional(expected));
+ }
+ 
+ BOOST_AUTO_TEST_CASE(simple_limit_length200) {
+@@ -338,7 +338,7 @@
+   linestring_type_fp expected;
+   expected.push_back(point_type_fp(0, 0));
+   expected.push_back(point_type_fp(100, 100));
+-  BOOST_CHECK_EQUAL(ret, make_optional(expected));
++  BOOST_CHECK_EQUAL(ret, boost::make_optional(expected));
+ }
+ 
+ BOOST_AUTO_TEST_CASE(simple_limit_length100) {
+@@ -368,7 +368,7 @@
+   linestring_type_fp expected;
+   expected.push_back(point_type_fp(0, 0));
+   expected.push_back(point_type_fp(1, 1));
+-  BOOST_CHECK_EQUAL(ret, make_optional(expected));
++  BOOST_CHECK_EQUAL(ret, boost::make_optional(expected));
+ }
+ 
+ BOOST_AUTO_TEST_CASE(hole_unreachable) {
+@@ -410,7 +410,7 @@
+   expected.push_back(point_type_fp(0, 0));
+   expected.push_back(point_type_fp(3, 7));
+   expected.push_back(point_type_fp(10, 10));
+-  BOOST_CHECK_EQUAL(ret, make_optional(expected));
++  BOOST_CHECK_EQUAL(ret, boost::make_optional(expected));
+ }
+ 
+ BOOST_AUTO_TEST_CASE(box_no_keep_in) {
+@@ -434,7 +434,7 @@
+   expected.push_back(point_type_fp(0, 0));
+   expected.push_back(point_type_fp(3, 7));
+   expected.push_back(point_type_fp(10, 10));
+-  BOOST_CHECK_EQUAL(ret, make_optional(expected));
++  BOOST_CHECK_EQUAL(ret, boost::make_optional(expected));
+ }
+ 
+ BOOST_AUTO_TEST_CASE(unreachable_box) {
+@@ -485,7 +485,7 @@
+   expected.push_back(point_type_fp(0, 0));
+   expected.push_back(point_type_fp(3, 7));
+   expected.push_back(point_type_fp(10, 10));
+-  BOOST_CHECK_EQUAL(ret, make_optional(expected));
++  BOOST_CHECK_EQUAL(ret, boost::make_optional(expected));
+ }
+ 
+ BOOST_AUTO_TEST_CASE(u_shape) {
+@@ -512,7 +512,7 @@
+   expected.push_back(point_type_fp(3, 3));
+   expected.push_back(point_type_fp(7, 3));
+   expected.push_back(point_type_fp(9, 9));
+-  BOOST_CHECK_EQUAL(ret, make_optional(expected));
++  BOOST_CHECK_EQUAL(ret, boost::make_optional(expected));
+ }
+ 
+ BOOST_AUTO_TEST_CASE(doughnut) {
+@@ -526,7 +526,7 @@
+                                infinity, boost::none);
+ 
+   linestring_type_fp expected{{10, 10},{30, 70},{51, 80},{90, 90}};
+-  BOOST_CHECK_EQUAL(ret, make_optional(expected));
++  BOOST_CHECK_EQUAL(ret, boost::make_optional(expected));
+ }
+ 
+ BOOST_AUTO_TEST_CASE(barbell_search) {
+@@ -542,7 +542,7 @@
+   multi_polygon_type_fp barbell{{{{0,0}, {0,50}, {40,50}, {40,2}, {60,2},
+                                   {60,50}, {100,50}, {100,0}, {0,0}}}};
+   auto surface = PathFindingSurface(boost::none, barbell, 5);
+-  BOOST_CHECK_EQUAL(surface.find_path({-10,-10},{110,60},infinity, make_optional(size_t(2))),
++  BOOST_CHECK_EQUAL(surface.find_path({-10,-10},{110,60},infinity, boost::make_optional(size_t(2))),
+                     boost::none);
+ }
+ 
+@@ -563,7 +563,7 @@
+   auto ret = surface.find_path({5,5}, point_type_fp(-1,-1),
+                                infinity, boost::none);
+   linestring_type_fp expected{{5,5},{3,10},{0,10},{-1,-1}};
+-  BOOST_CHECK_EQUAL(ret, make_optional(expected));
++  BOOST_CHECK_EQUAL(ret, boost::make_optional(expected));
+ }
+ 
+ BOOST_AUTO_TEST_SUITE_END()
+diff -urN pcb2gcode-9999.orig/surface_vectorial.cpp pcb2gcode-9999/surface_vectorial.cpp
+--- pcb2gcode-9999.orig/surface_vectorial.cpp	2021-05-19 10:04:48.239921443 +0200
++++ pcb2gcode-9999/surface_vectorial.cpp	2021-05-19 10:11:21.585421829 +0200
+@@ -58,7 +58,7 @@
+ #include <boost/format.hpp>
+ #include <boost/optional.hpp>
+ using boost::optional;
+-using boost::make_optional;
++//using boost::make_optional;
+ 
+ #include "flatten.hpp"
+ #include "tsp_solver.hpp"
+@@ -723,7 +723,7 @@
+            const double max_g1_distance = std::isinf(mill->backtrack) ?
+                g0_time * horizontalG1speed :
+                mill->backtrack*g0_time / (1 + mill->backtrack/horizontalG1speed);
+-           return path_finding_surface.find_path(a, b, max_g1_distance, make_optional(mill->path_finding_limit));
++           return path_finding_surface.find_path(a, b, max_g1_distance, boost::make_optional(mill->path_finding_limit));
+          };
+ }
+ 
+@@ -839,7 +839,7 @@
+       if (!reverse_spikes) {
+         if (polygon_index > 0) {
+           spike_offset = diameter - overlap;
+-          spikes_keep_out = make_optional(multi_polygon_type_fp{polygons[polygon_index - 1]});
++          spikes_keep_out = boost::make_optional(multi_polygon_type_fp{polygons[polygon_index - 1]});
+         } else {
+           spike_offset = 0;
+         }
+@@ -850,17 +850,17 @@
+         if (extra_passes % 2 == 0) {
+           if (polygon_index + 1 < polygons.size()) {
+             spike_offset = diameter - overlap;
+-            spikes_keep_in = make_optional(multi_polygon_type_fp{polygons[polygon_index + 1]});
++            spikes_keep_in = boost::make_optional(multi_polygon_type_fp{polygons[polygon_index + 1]});
+           } else {
+             spike_offset = 0;
+           }
+         } else {
+           if (polygon_index + 1 < polygons.size()) {
+             spike_offset = diameter - overlap;
+-            spikes_keep_in = make_optional(multi_polygon_type_fp{polygons[polygon_index + 1]});
++            spikes_keep_in = boost::make_optional(multi_polygon_type_fp{polygons[polygon_index + 1]});
+           } else {
+             spike_offset = (diameter - overlap)/2;
+-            spikes_keep_in = make_optional(multi_polygon_type_fp{current_voronoi});
++            spikes_keep_in = boost::make_optional(multi_polygon_type_fp{current_voronoi});
+           }
+         }
+       }
+@@ -985,7 +985,7 @@
+       for (const auto& poly : vectorial_surface->first) {
+         keep_outs.push_back(bg_helpers::buffer(poly, tool_diameter/2 + isolator->offset));
+       }
+-      const auto path_finding_surface = path_finding::PathFindingSurface(mask ? make_optional(mask->vectorial_surface->first) : boost::none, sum(keep_outs), isolator->tolerance);
++      const auto path_finding_surface = path_finding::PathFindingSurface(mask ? boost::make_optional(mask->vectorial_surface->first) : boost::none, sum(keep_outs), isolator->tolerance);
+       for (size_t trace_index = 0; trace_index < trace_count; trace_index++) {
+         multi_polygon_type_fp already_milled_shrunk =
+             bg_helpers::buffer(already_milled[trace_index], -tool_diameter/2 + tolerance);
+@@ -1033,7 +1033,7 @@
+       const string tool_suffix = tool_count > 1 ? "_" + std::to_string(tool_index) : "";
+       write_svgs(tool_suffix, tool_diameter, new_trace_toolpaths, isolator->tolerance, tool_index == tool_count - 1);
+       auto new_toolpath = flatten(new_trace_toolpaths);
+-      multi_linestring_type_fp combined_toolpath = post_process_toolpath(mill, make_optional(&path_finding_surface), new_toolpath);
++      multi_linestring_type_fp combined_toolpath = post_process_toolpath(mill, boost::make_optional(&path_finding_surface), new_toolpath);
+       write_svgs("_final" + tool_suffix, tool_diameter, combined_toolpath, isolator->tolerance, tool_index == tool_count - 1);
+       results[tool_index] = make_pair(tool_diameter, mirror_toolpath(combined_toolpath, mirror, ymirror));
+     }
diff --git a/sci-electronics/pcb2gcode/pcb2gcode-9999.ebuild b/sci-electronics/pcb2gcode/pcb2gcode-9999.ebuild
index d55c1d2..ce19332 100644
--- a/sci-electronics/pcb2gcode/pcb2gcode-9999.ebuild
+++ b/sci-electronics/pcb2gcode/pcb2gcode-9999.ebuild
@@ -30,6 +30,8 @@ DEPEND="dev-cpp/gtkmm:2.4
 	${RDEPEND}"
 
 src_prepare() {
+	eapply "${FILESDIR}/${P}-gcc-11.patch"
+
 	if [[ ${PV} == "9999" ]] ; then
 		eautoreconf
 	fi