diff -Naur spkg-1.0rc13-old//include/commands.h spkg-1.0rc13/include/commands.h
--- spkg-1.0rc13-old//include/commands.h	2010-06-14 09:29:00.000000000 +0300
+++ spkg-1.0rc13/include/commands.h	2011-02-09 15:37:50.818000041 +0200
@@ -34,6 +34,7 @@
   gboolean no_scripts; /**< Turn off scripts (doinst.sh) execution. */
   gboolean no_optsyms; /**< Turn off symlink optimizations. */
   gboolean no_ldconfig; /**< Turn off ldconfig execution. */
+  gboolean no_gtk_update_icon_cache; /**< Turn off gtk-update-icon-cache execution. */
   gboolean reinstall;  /**< Reinstall package when it is already installed (for upgrade). */
   gchar** bl_symopts;  /**< Blacklist for symlink optimizations. */
   gchar** bl_upgrade;  /**< Blacklist for upgrade. */
diff -Naur spkg-1.0rc13-old//src/cmd-install.c spkg-1.0rc13/src/cmd-install.c
--- spkg-1.0rc13-old//src/cmd-install.c	2010-06-14 09:30:32.000000000 +0300
+++ spkg-1.0rc13/src/cmd-install.c	2011-02-09 15:42:13.119000041 +0200
@@ -525,6 +525,7 @@
    - finish transaction
    - close package file
    - run doinst.sh
+   - run gtk-update-icon-cache in the hicolor icon dir
    - run ldconfig
    - remove install/
   */
@@ -600,6 +601,7 @@
   pkg->location = g_strdup(pkgfile);
 
   gboolean need_ldconfig = 0;
+  gboolean need_update_icon_cache = 0;
   gboolean has_doinst = 0;
   gchar* sane_path = NULL;
   gchar* root = sanitize_root_path(opts->root);
@@ -637,6 +639,10 @@
     if (!need_ldconfig && g_str_has_suffix(sane_path, ".so"))
       need_ldconfig = 1;
 
+    /* check if package contains .desktop files */
+    if (!need_update_icon_cache && g_str_has_suffix(sane_path, ".desktop"))
+      need_update_icon_cache = 1;
+
     /* check for metadata files */
     if (!strcmp(sane_path, "install/slack-desc"))
     {
@@ -766,6 +772,29 @@
     }
   }
 
+  /* run gtk-update-icon-cache */
+  if (need_update_icon_cache && !opts->no_gtk_update_icon_cache)
+  {
+    if (access("/usr/bin/gtk-update-icon-cache", X_OK) == 0)
+    {
+        gchar* cmd = g_strdup_printf("/usr/bin/gtk-update-icon-cache %susr/share/icons/hicolor > /dev/null 2>&1", root);
+
+        _notice("Running /usr/bin/gtk-update-icon-cache...");
+        if (!opts->dryrun)
+        {
+          gint rv = system(cmd);
+          if (rv < 0)
+            _warning("Can't execute /usr/bin/gtk-update-icon-cache. (%s)", strerror(errno));
+          else if (rv > 0)
+            _warning("Program /usr/bin/gtk-update-icon-cache failed. (%d)", rv);
+	}
+    }
+    else
+    {
+      _warning("Program /usr/bin/gtk-update-icon-cache was not found on the system.");
+    }
+  }
+ 
   if (!opts->dryrun)
   {
     gchar* install_path = g_strdup_printf("%sinstall", root);
diff -Naur spkg-1.0rc13-old//src/cmd-upgrade.c spkg-1.0rc13/src/cmd-upgrade.c
--- spkg-1.0rc13-old//src/cmd-upgrade.c	2009-06-26 18:55:43.000000000 +0300
+++ spkg-1.0rc13/src/cmd-upgrade.c	2011-02-09 15:41:33.960000042 +0200
@@ -630,6 +630,7 @@
    - close package file
    - run doinst.sh
    - run ldconfig
+   - run gtk-update-icon-cache in the hicolor icon dir
    - remove install/
   */
 
@@ -736,6 +737,7 @@
   pkg->location = g_strdup(pkgfile);
 
   gboolean need_ldconfig = 0;
+  gboolean need_update_icon_cache = 0;
   gboolean has_doinst = 0;
   gchar* sane_path = NULL;
   gchar* root = sanitize_root_path(opts->root);
@@ -774,6 +776,10 @@
     if (!need_ldconfig && g_str_has_suffix(sane_path, ".so"))
       need_ldconfig = 1;
 
+    /* check if package contains .desktop files */
+    if (!need_update_icon_cache && g_str_has_suffix(sane_path, ".desktop"))
+      need_update_icon_cache = 1;
+
     /* check for metadata files */
     if (!strcmp(sane_path, "install/slack-desc"))
     {
@@ -912,6 +918,29 @@
     }
   }
 
+  /* run gtk-update-icon-cache */
+  if (need_update_icon_cache && !opts->no_gtk_update_icon_cache)
+  {
+    if (access("/usr/bin/gtk-update-icon-cache", X_OK) == 0)
+    {
+        gchar* cmd = g_strdup_printf("/usr/bin/gtk-update-icon-cache %susr/share/icons/hicolor > /dev/null 2>&1", root);
+
+        _notice("Running /usr/bin/gtk-update-icon-cache...");
+        if (!opts->dryrun)
+        {
+          gint rv = system(cmd);
+          if (rv < 0)
+            _warning("Can't execute /usr/bin/gtk-update-icon-cache. (%s)", strerror(errno));
+          else if (rv > 0)
+            _warning("Program /usr/bin/gtk-update-icon-cache failed. (%d)", rv);
+	}
+    }
+    else
+    {
+      _warning("Program /usr/bin/gtk-update-icon-cache was not found on the system.");
+    }
+  }
+
   if (!opts->dryrun)
   {
     gchar* install_path = g_strdup_printf("%sinstall", root);
diff -Naur spkg-1.0rc13-old//src/main.c spkg-1.0rc13/src/main.c
--- spkg-1.0rc13-old//src/main.c	2010-06-14 09:31:47.000000000 +0300
+++ spkg-1.0rc13/src/main.c	2011-02-09 15:31:59.111000042 +0200
@@ -68,6 +68,7 @@
   .no_optsyms = 0,
   .no_scripts = 0,
   .no_ldconfig = 0,
+  .no_gtk_update_icon_cache = 0,
   .reinstall = 0,
   .bl_symopts = default_bl_symopts,
   .bl_upgrade = default_bl_upgrade
@@ -135,6 +136,11 @@
   "no-ldconfig", 0, 0, &cmd_opts.no_ldconfig, 0,
   "Don't execute ldconfig after installation and upgrade.", NULL
 },
+{
+  "no-gtk-update-icon-cache", 0, 0, &cmd_opts.no_gtk_update_icon_cache, 0,
+  "Don't execute gtk-update-icon-cache after installation and upgrade "
+  "even if a .desktop file is included in the package.", NULL
+},
 POPT_TABLEEND
 };