diff --git a/README.md b/README.md
index a2f0a9f..a6d5444 100644
--- a/README.md
+++ b/README.md
@@ -45,6 +45,7 @@ It is strongly encouraged to submit pull-requests to suggest fixes and enhanceme
 To build the theme the follwing packages are required
 * `autoconf`
 * `automake`
+* `sassc` (not for Ubuntu 16.04 - this distro assumes you have compiled with gulp)
 * `pkg-config` or `pkgconfig` for Fedora
 * `libgtk-3-dev` for Debian based distros or `gtk3-devel` for RPM based distros
 * `git` to clone the source directory
@@ -93,6 +94,7 @@ Other options to pass to autogen.sh are
                                option should not be needed.
                                Note 2: For GNOME 3.24 and 3.26, use --with-gnome-version=3.22
                                (this works for now, the build system will be improved in the future)
+    --with-custom=<script>     run the executable script file in the custom subfolder
 
 After the installation is complete the theme can be activated with `gnome-tweak-tool` or a similar program by selecting `Arc`, `Arc-Darker` or `Arc-Dark` as Window/GTK+ theme and `Arc` or `Arc-Dark` as GNOME Shell/Cinnamon theme.
 
diff --git a/common/Makefile.am b/common/Makefile.am
index 58f54d8..9f2e5ab 100644
--- a/common/Makefile.am
+++ b/common/Makefile.am
@@ -140,6 +140,11 @@ if ENABLE_LIGHT
 
 	cd $(srcdir)/gtk-3.0 && cp thumbnail.png $(ithemedir)/gtk-3.0
 
+	@if [ "$(GNOME_VERSION)" != "3.18" ]; then \
+		sassc $(srcdir)/gtk-3.0/$(GNOME_VERSION)/sass/gtk.scss $(srcdir)/gtk-3.0/$(GNOME_VERSION)/gtk.css;\
+		sassc $(srcdir)/gtk-3.0/$(GNOME_VERSION)/sass/gtk-dark.scss $(srcdir)/gtk-3.0/$(GNOME_VERSION)/gtk-dark.css;\
+	fi
+
 	cd $(srcdir)/gtk-3.0/$(GNOME_VERSION) && cp -R \
 		assets \
 		gtk.css \
@@ -152,6 +157,12 @@ if ENABLE_DARKER
 
 	cd $(srcdir)/gtk-3.0 && cp thumbnail.png $(ithemedarkerdir)/gtk-3.0
 
+	@if [ "$(GNOME_VERSION)" != "3.18" ]; then \
+		sassc $(srcdir)/gtk-3.0/$(GNOME_VERSION)/sass/gtk-dark.scss $(srcdir)/gtk-3.0/$(GNOME_VERSION)/gtk-dark.css;\
+		sassc $(srcdir)/gtk-3.0/$(GNOME_VERSION)/sass/gtk-darker.scss $(srcdir)/gtk-3.0/$(GNOME_VERSION)/gtk-darker.css;\
+		sassc $(srcdir)/gtk-3.0/$(GNOME_VERSION)/sass/gtk.scss $(srcdir)/gtk-3.0/$(GNOME_VERSION)/gtk.css;\
+	fi
+
 	cd $(srcdir)/gtk-3.0/$(GNOME_VERSION) && cp -R \
 		assets \
 		gtk-dark.css \
@@ -171,6 +182,11 @@ if ENABLE_DARK
 		assets \
 		$(ithemedarkdir)/gtk-3.0
 
+	@if [ "$(GNOME_VERSION)" != "3.18" ]; then \
+		sassc $(srcdir)/gtk-3.0/$(GNOME_VERSION)/sass/gtk-dark.scss $(srcdir)/gtk-3.0/$(GNOME_VERSION)/gtk-dark.css;\
+		sassc $(srcdir)/gtk-3.0/$(GNOME_VERSION)/sass/gtk.scss $(srcdir)/gtk-3.0/$(GNOME_VERSION)/gtk.css;\
+	fi
+
 	cd $(srcdir)/gtk-3.0/$(GNOME_VERSION) && cp -R \
 		gtk-dark.css \
 		$(ithemedarkdir)/gtk-3.0/gtk.css
@@ -179,6 +195,13 @@ endif # ENABLE_DARK
 if !ENABLE_TRANSPARENCY
 
 if ENABLE_LIGHT
+	@if [ "$(GNOME_VERSION)" != "3.18" ]; then \
+		sassc $(srcdir)/gtk-3.0/$(GNOME_VERSION)/sass/gtk-solid.scss $(srcdir)/gtk-3.0/$(GNOME_VERSION)/gtk-solid.css;\
+		sassc $(srcdir)/gtk-3.0/$(GNOME_VERSION)/sass/gtk-solid-dark.scss $(srcdir)/gtk-3.0/$(GNOME_VERSION)/gtk-solid-dark.css;\
+		sassc $(srcdir)/gtk-3.0/$(GNOME_VERSION)/sass/gtk.scss $(srcdir)/gtk-3.0/$(GNOME_VERSION)/gtk.css;\
+		sassc $(srcdir)/gtk-3.0/$(GNOME_VERSION)/sass/gtk-dark.scss $(srcdir)/gtk-3.0/$(GNOME_VERSION)/gtk-dark.css;\
+	fi
+
 	cd $(srcdir)/gtk-3.0/$(GNOME_VERSION) && cp -R \
 		gtk-solid.css \
 		$(ithemedir)/gtk-3.0/gtk.css
@@ -189,6 +212,13 @@ if ENABLE_LIGHT
 endif # ENABLE_LIGHT
 
 if ENABLE_DARKER
+	@if [ "$(GNOME_VERSION)" != "3.18" ]; then \
+		sassc $(srcdir)/gtk-3.0/$(GNOME_VERSION)/sass/gtk-solid-darker.scss $(srcdir)/gtk-3.0/$(GNOME_VERSION)/gtk-solid-darker.css;\
+		sassc $(srcdir)/gtk-3.0/$(GNOME_VERSION)/sass/gtk-solid-dark.scss $(srcdir)/gtk-3.0/$(GNOME_VERSION)/gtk-solid-dark.css;\
+		sassc $(srcdir)/gtk-3.0/$(GNOME_VERSION)/sass/gtk.scss $(srcdir)/gtk-3.0/$(GNOME_VERSION)/gtk.css;\
+		sassc $(srcdir)/gtk-3.0/$(GNOME_VERSION)/sass/gtk-dark.scss $(srcdir)/gtk-3.0/$(GNOME_VERSION)/gtk-dark.css;\
+	fi
+
 	cd $(srcdir)/gtk-3.0/$(GNOME_VERSION) && cp -R \
 		gtk-solid-darker.css \
 		$(ithemedarkerdir)/gtk-3.0/gtk.css
@@ -199,6 +229,11 @@ if ENABLE_DARKER
 endif # ENABLE_DARKER
 
 if ENABLE_DARK
+	@if [ "$(GNOME_VERSION)" != "3.18" ]; then \
+		sassc $(srcdir)/gtk-3.0/$(GNOME_VERSION)/sass/gtk-solid-dark.scss $(srcdir)/gtk-3.0/$(GNOME_VERSION)/gtk-solid-dark.css;\
+		sassc $(srcdir)/gtk-3.0/$(GNOME_VERSION)/sass/gtk.scss $(srcdir)/gtk-3.0/$(GNOME_VERSION)/gtk.css;\
+	fi
+
 	cd $(srcdir)/gtk-3.0/$(GNOME_VERSION) && cp -R \
 		gtk-solid-dark.css \
 		$(ithemedarkdir)/gtk-3.0/gtk.css
diff --git a/configure.ac b/configure.ac
index 56cf234..60f21c7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
 AC_INIT(
     [arc-theme],
-    [20161119],
+    [20171105],
     [https://github.com/horst3180/Arc-theme/issues],
     [arc-theme],
     [https://github.com/horst3180/Arc-theme],