diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index 85df234..ecddf1b 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -34,3 +34,4 @@ jobs:
           ./generate.sh
           ./build.sh
           ./build/bb test
+          ./build/bb reproduce
diff --git a/src/compiler.bbb b/src/compiler.bbb
index e1099b8..a5d68ab 100644
--- a/src/compiler.bbb
+++ b/src/compiler.bbb
@@ -984,6 +984,7 @@ CompilerCommand = enum
 {
     compile,
     test,
+    reproduce,
 }
 
 BuildMode = enum
@@ -18283,7 +18284,7 @@ compile_file = fn (arena: &Arena, compile_options: CompileFile, envp: &&u8) []u8
     {
         >builder: ArgumentBuilder = zero;
 
-        add_argument(&builder, "/home/david/dev/llvm/install/llvm_20.1.3_x86_64-linux-Release/bin/llvm-config");
+        add_argument(&builder, arena_join_string(module.arena, [ CMAKE_PREFIX_PATH, "/bin/llvm-config"][..]);
         add_argument(&builder, "--libdir");
         add_argument(&builder, "--libs");
         add_argument(&builder, "--system-libs");
@@ -18558,7 +18559,10 @@ names: [_][]u8 =
         return 1;
     }
 
+    >debug_info_array: [_]u1 = [1, 0];
+
     >command = command_string_to_enum.enum_value;
+
     switch (command)
     {
         .compile =>
@@ -18620,7 +18624,6 @@ names: [_][]u8 =
                 report_error();
             }
 
-            >debug_info_array: [_]u1 = [1, 0];
             for (name: names)
             {
                 for (build_mode: #enum_values(BuildMode))
@@ -18656,6 +18659,43 @@ names: [_][]u8 =
                 }
             }
         },
+        .reproduce =>
+        {
+            for (build_mode: #enum_values(BuildMode))
+            {
+                for (has_debug_info: debug_info_array)
+                {
+                    >position = arena.position;
+
+                    // Produce the compiler
+                    >relative_file_path = "src/compiler.bbb";
+                    >executable_path = compile_file(arena, {
+                        .relative_file_path = relative_file_path,
+                        .build_mode = build_mode,
+                        .has_debug_info = has_debug_info,
+                        .silent = 1,
+                    }, envp);
+
+                    // Test the compiler
+                    >arguments: [_]&u8 = [
+                        executable_path.pointer,
+                        "test",
+                        zero,
+                    ];
+                    >args = arguments[..arguments.length - 1];
+                    >execution = os_execute(arena, args, envp, zero);
+
+                    >success = execution.termination_kind == .exit and execution.termination_code == 0;
+
+                    if (!success)
+                    {
+                        #trap();
+                    }
+
+                    arena.position = position;
+                }
+            }
+        },
     }
 
     return 0;
diff --git a/src/compiler.cpp b/src/compiler.cpp
index 8ba2702..a697397 100644
--- a/src/compiler.cpp
+++ b/src/compiler.cpp
@@ -93,6 +93,7 @@ fn void compile(Arena* arena, Options options)
         .name = options.name,
         .path = options.path,
         .executable = options.executable,
+        .definitions = options.definitions,
         .objects = options.objects,
         .library_directories = options.library_directories,
         .library_names = options.library_names,
@@ -174,6 +175,13 @@ fn String compile_file(Arena* arena, Compile options)
     auto file_content = file_read(arena, relative_file_path);
     auto file_path = path_absolute(arena, relative_file_path);
 
+    Slice<Definition> definitions = {};
+    auto cmake_prefix_path = string_literal(CMAKE_PREFIX_PATH);
+    auto cmake_prefix_path_definition = Definition{
+        .name = string_literal("CMAKE_PREFIX_PATH"),
+        .value = cmake_prefix_path,
+    };
+
     String objects[] = {
         output_object_path,
     };
@@ -190,9 +198,11 @@ fn String compile_file(Arena* arena, Compile options)
 
     if (is_compiler)
     {
+        definitions = { .pointer = &cmake_prefix_path_definition, .length = 1 };
+
         ArgBuilder builder = {};
         String llvm_config_parts[] = {
-            string_literal(CMAKE_PREFIX_PATH),
+            cmake_prefix_path,
             string_literal("/bin/llvm-config"),
         };
         builder.add(arena, arena_join_string(arena, array_to_slice(llvm_config_parts)));
@@ -300,6 +310,7 @@ fn String compile_file(Arena* arena, Compile options)
             .path = file_path,
             .executable = output_executable_path,
             .name = base_name,
+            .definitions = definitions,
             .objects = object_slice,
             .library_paths = library_paths,
             .library_names = library_names,
@@ -619,6 +630,24 @@ void entry_point(Slice<char* const> arguments, Slice<char* const> envp)
                         print(compiler_has_debug_info ? string_literal(" with debug info\n") : string_literal(" with no debug info\n"));
                         bb_fail();
                     }
+
+                    char* const reproduce_arguments[] =
+                    {
+                        (char*)compiler.pointer,
+                        (char*)"reproduce",
+                        0,
+                    };
+                    arg_slice = array_to_slice(reproduce_arguments);
+                    arg_slice.length -= 1;
+                    execution = os_execute(arena, arg_slice, environment, {});
+                    success = execution.termination_kind == TerminationKind::exit && execution.termination_code == 0;
+                    if (!success)
+                    {
+                        print(string_literal("Self-hosted reproduction failed: "));
+                        print(build_mode_to_string(compiler_build_mode));
+                        print(compiler_has_debug_info ? string_literal(" with debug info\n") : string_literal(" with no debug info\n"));
+                        bb_fail();
+                    }
                 }
             }
         } break;
diff --git a/src/compiler.hpp b/src/compiler.hpp
index c11bb2e..1c9d699 100644
--- a/src/compiler.hpp
+++ b/src/compiler.hpp
@@ -1296,6 +1296,12 @@ struct ModuleLLVM
     u32 debug_tag;
 };
 
+struct Definition
+{
+    String name;
+    String value;
+};
+
 struct Module
 {
     Arena* arena;
@@ -1330,6 +1336,7 @@ struct Module
     String path;
     String executable;
 
+    Slice<Definition> definitions;
     Slice<String> objects;
     Slice<String> library_directories;
     Slice<String> library_names;
@@ -1408,6 +1415,7 @@ struct Options
     String path;
     String executable;
     String name;
+    Slice<Definition> definitions;
     Slice<String> objects;
     Slice<String> library_paths;
     Slice<String> library_names;
diff --git a/src/parser.cpp b/src/parser.cpp
index 1eca489..486692c 100644
--- a/src/parser.cpp
+++ b/src/parser.cpp
@@ -3166,6 +3166,25 @@ fn Block* parse_block(Module* module, Scope* parent_scope)
 void parse(Module* module)
 {
     auto scope = &module->scope;
+
+    for (auto definition: module->definitions)
+    {
+        auto definition_global = new_global(module);
+        auto definition_value = new_value(module);
+        *definition_value = {
+            .string_literal = definition.value,
+            .id = ValueId::string_literal,
+        };
+        *definition_global = Global{
+            .variable = {
+                .initial_value = definition_value,
+                .type = get_slice_type(module, uint8(module)),
+                .scope = scope,
+                .name = definition.name,
+            },
+        };
+    }
+
     while (1)
     {
         skip_space(module);