diff --git a/.gitignore b/.gitignore
index ec03eed..446dd89 100644
--- a/.gitignore
+++ b/.gitignore
@@ -196,3 +196,19 @@ ModelManifest.xml
 /tr2.bat
 /tr.bat
 /test
+
+# Qt build artifacts
+*.o
+*.a
+moc_*.cpp
+moc_*.h
+ui_*.h
+qrc_*.cpp
+*.pro.user
+*.pro.user.*
+.qmake.stash
+Makefile*
+zkanji
+zkanji.ini
+data/
+import_data/
diff --git a/checked_cast.h b/checked_cast.h
index dd459b7..ea23192 100644
--- a/checked_cast.h
+++ b/checked_cast.h
@@ -18,6 +18,7 @@
 #endif
 
 #include <cassert>
+#include <cstdint>
 
 /*
 // Converts T value to RESULT_TYPE, which must be a signed number. RESULT_TYPE is by default
diff --git a/groups.cpp b/groups.cpp
index 4abb230..8bb65a9 100644
--- a/groups.cpp
+++ b/groups.cpp
@@ -2786,3 +2786,8 @@ void Groups::processRemovedWord(int windex)
 
 //-------------------------------------------------------------
 
+template GroupCategory<KanjiGroup>::self_type* GroupCategory<KanjiGroup>::categories(int index);
+template const GroupCategory<KanjiGroup>::self_type* GroupCategory<KanjiGroup>::categories(int index) const;
+template GroupCategory<WordGroup>::self_type* GroupCategory<WordGroup>::categories(int index);
+template const GroupCategory<WordGroup>::self_type* GroupCategory<WordGroup>::categories(int index) const;
+
diff --git a/zcolorcombobox.h b/zcolorcombobox.h
index 04e8826..b176428 100644
--- a/zcolorcombobox.h
+++ b/zcolorcombobox.h
@@ -125,8 +125,8 @@ private slots:
     int oldindex;
 
     using QComboBox::activated;
-    using QComboBox::activated;
-    using QComboBox::currentIndexChanged;
+    // using QComboBox::activated;
+    // using QComboBox::currentIndexChanged;
     using QComboBox::currentIndexChanged;
     using QComboBox::currentTextChanged;