5 files changed, 20 insertions, 5 deletions
diff --git a/mesonbuild/modules/qt.py b/mesonbuild/modules/qt.py
index d5c327368..83dcf31bd 100644
--- a/mesonbuild/modules/qt.py
+++ b/mesonbuild/modules/qt.py
@@ -23,7 +23,7 @@ from . import ModuleReturnValue, ExtensionModule
 from .. import build
 from .. import coredata
 from .. import mlog
-from ..dependencies import find_external_dependency, Dependency, ExternalLibrary
+from ..dependencies import find_external_dependency, Dependency, ExternalLibrary, InternalDependency
 from ..mesonlib import MesonException, File, version_compare, Popen_safe
 from ..interpreter import extract_required_kwarg
 from ..interpreter.type_checking import INSTALL_DIR_KW, INSTALL_KW, NoneType
@@ -457,7 +457,10 @@ class QtBaseModule(ExtensionModule):
         inc = state.get_include_args(include_dirs=kwargs['include_directories'])
         compile_args: T.List[str] = []
         for dep in kwargs['dependencies']:
-            compile_args.extend([a for a in dep.get_all_compile_args() if a.startswith(('-I', '-D'))])
+            compile_args.extend(a for a in dep.get_all_compile_args() if a.startswith(('-I', '-D')))
+            if isinstance(dep, InternalDependency):
+                for incl in dep.include_directories:
+                    compile_args.extend(f'-I{i}' for i in incl.to_string_list(self.interpreter.source_root, self.interpreter.environment.build_dir))
 
         output: T.List[build.GeneratedList] = []
 
diff --git a/test cases/frameworks/4 qt/manualinclude.cpp b/test cases/frameworks/4 qt/manualinclude.cpp
index 60b94e510..ef151a44a 100644
--- a/test cases/frameworks/4 qt/manualinclude.cpp
+++ b/test cases/frameworks/4 qt/manualinclude.cpp
@@ -1,4 +1,5 @@
 #include"manualinclude.h"
+#include <mocdep.h>
 #include<QCoreApplication>
 
 #include<QObject>
diff --git a/test cases/frameworks/4 qt/meson.build b/test cases/frameworks/4 qt/meson.build
index 825cd5766..04a5288bf 100644
--- a/test cases/frameworks/4 qt/meson.build
+++ b/test cases/frameworks/4 qt/meson.build
@@ -2,6 +2,9 @@ project('qt4, qt5, and qt6 build test', 'cpp',
   # Qt6 requires C++ 17 support
   default_options : ['cpp_std=c++17'])
 
+# Visit the subdir before entering the loop
+subdir('mocdep')
+
 qt5_modules = ['Widgets']
 qt6_modules = ['Widgets']
 foreach qt : ['qt4', 'qt5', 'qt6']
@@ -114,17 +117,21 @@ foreach qt : ['qt4', 'qt5', 'qt6']
       moc_extra_arguments : ['-DMOC_EXTRA_FLAG'], # This is just a random macro to test `extra_arguments`
       moc_sources : 'manualinclude.cpp',
       moc_headers : 'manualinclude.h',
-      method : get_option('method'))
+      method : get_option('method'),
+      dependencies: mocdep,
+    )
 
     manpreprocessed = qtmodule.compile_moc(
       extra_args : ['-DMOC_EXTRA_FLAG'], # This is just a random macro to test `extra_arguments`
       sources : 'manualinclude.cpp',
       headers : 'manualinclude.h',
-      method : get_option('method'))
+      method : get_option('method'),
+      dependencies: mocdep,
+    )
 
     qtmaninclude = executable(qt + 'maninclude',
       sources : ['manualinclude.cpp', manpreprocessed],
-      dependencies : qtcore)
+      dependencies : [qtcore, mocdep])
 
     test(qt + 'maninclude', qtmaninclude)
 
diff --git a/test cases/frameworks/4 qt/mocdep/meson.build b/test cases/frameworks/4 qt/mocdep/meson.build
new file mode 100644
index 000000000..174b42679
--- /dev/null
+++ b/test cases/frameworks/4 qt/mocdep/meson.build
@@ -0,0 +1,3 @@
+mocdep = declare_dependency(
+    include_directories: include_directories('.'),
+)
diff --git a/test cases/frameworks/4 qt/mocdep/mocdep.h b/test cases/frameworks/4 qt/mocdep/mocdep.h
new file mode 100644
index 000000000..357a52c3d
--- /dev/null
+++ b/test cases/frameworks/4 qt/mocdep/mocdep.h
@@ -0,0 +1 @@
+#define MOC_DEP 1