diff --git a/app/core/gimp-utils.c b/app/core/gimp-utils.c
index 05182b65a9..e2e8f509b3 100644
--- a/app/core/gimp-utils.c
+++ b/app/core/gimp-utils.c
@@ -146,7 +146,9 @@ gimp_get_default_language (const gchar *category)
 {
   gchar *lang;
   gchar *p;
+#ifndef G_OS_WIN32
   gint   cat = LC_CTYPE;
+#endif
 
   if (! category)
     category = "LC_CTYPE";
diff --git a/app/errors.c b/app/errors.c
index 3139ea24f1..d12be158c3 100644
--- a/app/errors.c
+++ b/app/errors.c
@@ -321,7 +321,9 @@ gimp_eek (const gchar *reason,
           ! the_errors_gimp->no_interface         &&
           backtrace_file)
         {
+#ifndef G_OS_WIN32
           FILE     *fd;
+#endif
           gboolean  has_backtrace = TRUE;
 
           /* If GUI backtrace enabled (it is disabled by default), it
diff --git a/app/main.c b/app/main.c
index 7ce100ef0c..9514cb398a 100644
--- a/app/main.c
+++ b/app/main.c
@@ -555,6 +555,10 @@ main (int    argc,
   GOptionGroup   *gimp_group         = NULL;
   gchar          *backtrace_file     = NULL;
   GError         *error              = NULL;
+#ifdef G_OS_WIN32
+  gchar          *utf8_name;
+  wchar_t        *name;
+#endif
 #ifndef GIMP_CONSOLE_COMPILATION
   GKeyFile       *flatpak_keyfile;
 #endif
@@ -607,8 +611,8 @@ main (int    argc,
 
 #ifdef G_OS_WIN32
   /* Make Inno aware of gimp process avoiding broken install/unninstall */
-  char    *utf8_name = g_strdup_printf ("GIMP-%s", GIMP_MUTEX_VERSION);
-  wchar_t *name      = g_utf8_to_utf16 (utf8_name, -1, NULL, NULL, NULL);
+  utf8_name = g_strdup_printf ("GIMP-%s", GIMP_MUTEX_VERSION);
+  name      = g_utf8_to_utf16 (utf8_name, -1, NULL, NULL, NULL);
 
   CreateMutexW (NULL, FALSE, name);
 
@@ -625,8 +629,10 @@ main (int    argc,
     const gchar *install_dir;
     gchar       *bin_dir;
     LPWSTR       w_bin_dir;
+#ifdef ENABLE_RELOCATABLE_RESOURCES
     size_t       path_len;
     gchar       *path;
+#endif
 
     /* On Windows, set DLL search path to $INSTALLDIR/bin so that .exe
      * plug-ins processes in the plug-ins directory can find libgimp and
diff --git a/modules/gimpinputdevicestore-dx.c b/modules/gimpinputdevicestore-dx.c
index 82a926f05c..3adad9aa87 100644
--- a/modules/gimpinputdevicestore-dx.c
+++ b/modules/gimpinputdevicestore-dx.c
@@ -358,7 +358,7 @@ gimp_input_device_store_add (GimpInputDeviceStore *store,
 
   if (UuidToString (guid, &s) != S_OK)
     return FALSE;
-  guidstring = g_strdup (s);
+  guidstring = g_strdup ((char *) s);
   RpcStringFree (&s);
 
   if (FAILED ((hresult = IDirectInput8_CreateDevice (store->directinput8,