Try the suggested workaround in lexy for older compilers.

.github/workflows/ccpp.yml

@@ -8,7 +8,7 @@ concurrency:
 
 jobs:
   build-linux:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
     - uses: actions/checkout@v4
       with:
@@ -20,7 +20,7 @@ jobs:
         path: 'fluxengine-testdata'
     - name: apt
       run: |
-        sudo apt install libudev-dev libsqlite3-dev protobuf-compiler libwxgtk3.2-dev libfmt-dev libprotobuf-dev
+        sudo apt install libudev-dev libsqlite3-dev protobuf-compiler libwxgtk3.0-gtk3-dev libfmt-dev libprotobuf-dev
     - name: make
       run: CXXFLAGS="-Wp,-D_GLIBCXX_ASSERTIONS" make -j`nproc` -C fluxengine
 

lib/data/locations.cc

@@ -46,7 +46,7 @@ namespace grammar
         static constexpr auto rule =
             dsl::list(dsl::p<member>, dsl::sep(dsl::lit_c<','>));
         static constexpr auto value = lexy::fold_inplace<std::vector<unsigned>>(
-            {},
+            std::initializer_list<unsigned>{},
             [](std::vector<unsigned>& result, const Member& item)
             {
                 if (item.start < 0)
@@ -83,7 +83,8 @@ namespace grammar
         static constexpr auto rule =
             dsl::list(dsl::p<ch>, dsl::sep(dsl::ascii::space));
         static constexpr auto value =
-            lexy::fold_inplace<std::vector<CylinderHead>>({},
+            lexy::fold_inplace<std::vector<CylinderHead>>(
+                std::initializer_list<CylinderHead>{},
                 [](std::vector<CylinderHead>& result,
                     const std::vector<CylinderHead>& item)
                 {