diff --git a/Makefile b/Makefile
index bf7abb7..38e2ace 100644
--- a/Makefile
+++ b/Makefile
@@ -21,8 +21,13 @@ ibus-xml:
 
 	$(shell SCHEMES=("ml" "ta" "hi" "te" "ka" "bn"); for s in $${SCHEMES[@]}; do echo $s; ./${BIN} -s $$s -lang $$s -xml component/varnam-$$s.xml -prefix ${INSTALL_PREFIX}; done)
 
+ubuntu-14:
+	CGO_CFLAGS="-w" go build -tags "pango_1_36,gtk_3_10,glib_2_40,cairo_1_13,gdk_pixbuf_2_30" -ldflags "-s -w" -o ${BIN} .
+	$(MAKE) ibus-xml
+	$(MAKE) install-script
+
 ubuntu-18:
-	go build -tags pango_1_42,gtk_3_22 -ldflags "-s -w" -o ${BIN} .
+	go build -tags "pango_1_42,gtk_3_22,glib_2_66,cairo_1_15" -ldflags "-s -w" -o ${BIN} .
 	$(MAKE) ibus-xml
 	$(MAKE) install-script
 
diff --git a/docker/Dockerfile b/docker/Dockerfile
new file mode 100644
index 0000000..b9a042b
--- /dev/null
+++ b/docker/Dockerfile
@@ -0,0 +1,36 @@
+FROM ubuntu:trusty 
+
+WORKDIR /root
+
+RUN apt-get update
+
+# Install gtk headers
+RUN apt-get install -y wget libgtk-3-dev libcairo2-dev libglib2.0-dev
+
+# Install go
+RUN wget -O go.tar.gz https://go.dev/dl/go1.17.4.linux-amd64.tar.gz; \
+tar -xf go.tar.gz;
+
+RUN apt-get install -y git build-essential clang pkg-config zip;
+
+RUN git clone https://github.com/varnamproject/govarnam.git; \
+git clone https://github.com/varnamproject/govarnam-ibus.git
+
+ENV PATH="/root/go/bin:${PATH}"
+
+WORKDIR /root/govarnam
+
+RUN CC=clang make; \
+sudo make install; \
+make release
+
+RUN mkdir -p /extract; \
+cp *.zip /extract
+
+WORKDIR /root/govarnam-ibus
+
+RUN git checkout gtk-3.10-ubuntu-14.04; \
+make ubuntu-14; \
+make release
+
+RUN cp *.zip /extract
diff --git a/docker/README.md b/docker/README.md
new file mode 100644
index 0000000..4860b98
--- /dev/null
+++ b/docker/README.md
@@ -0,0 +1,14 @@
+# Docker
+
+Builds `govarnam` & `govarnam-ibus` for Ubuntu 14.04 (GTK 3.10, glibc 2.19) & later versions:
+
+```bash
+docker build -t varnam .
+```
+
+Copy built artifacts from container using:
+```bash
+id=$(docker create varnam)
+docker cp $id:/extract/. ./
+docker rm -v $id
+```
\ No newline at end of file
diff --git a/go.mod b/go.mod
index f02c65f..1c03af9 100644
--- a/go.mod
+++ b/go.mod
@@ -4,8 +4,7 @@ go 1.15
 
 require (
 	github.com/godbus/dbus/v5 v5.0.3
-	github.com/gotk3/gotk3 v0.6.0
-	github.com/mattn/go-pointer v0.0.1 // indirect
+	github.com/gotk3/gotk3 v0.6.2-0.20211107090813-1d544513fb74
 	github.com/varnamproject/govarnam v0.0.0-00010101000000-000000000000
 )
 
diff --git a/go.sum b/go.sum
index 68038c6..b81c54b 100644
--- a/go.sum
+++ b/go.sum
@@ -1,6 +1,5 @@
 github.com/godbus/dbus/v5 v5.0.3 h1:ZqHaoEF7TBzh4jzPmqVhE/5A1z9of6orkAe5uHoAeME=
 github.com/godbus/dbus/v5 v5.0.3/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
-github.com/gotk3/gotk3 v0.6.0 h1:Aqlq4/6VabNwtCyA9M9zFNad5yHAqCi5heWnZ9y+3dA=
-github.com/gotk3/gotk3 v0.6.0/go.mod h1:/hqFpkNa9T3JgNAE2fLvCdov7c5bw//FHNZrZ3Uv9/Q=
-github.com/mattn/go-pointer v0.0.1/go.mod h1:2zXcozF6qYGgmsG+SeTZz3oAbFLdD3OWqnUbNvJZAlc=
+github.com/gotk3/gotk3 v0.6.2-0.20211107090813-1d544513fb74 h1:3ZID57DpPn1xRXRzXYl5Sm4OQ4LJG4IFlGo+1TT6xWQ=
+github.com/gotk3/gotk3 v0.6.2-0.20211107090813-1d544513fb74/go.mod h1:/hqFpkNa9T3JgNAE2fLvCdov7c5bw//FHNZrZ3Uv9/Q=
 github.com/mattn/go-sqlite3 v1.14.6/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
diff --git a/preferences.go b/preferences.go
index 55361c6..0cda9c1 100644
--- a/preferences.go
+++ b/preferences.go
@@ -130,8 +130,11 @@ func makeSettingsPage() *gtk.Box {
 	settingsPage, err := gtk.BoxNew(gtk.ORIENTATION_VERTICAL, 6)
 	checkError(err)
 
-	settingsPage.SetMarginStart(12)
-	settingsPage.SetMarginEnd(12)
+	// gtk_widget_set_margin_left & right is deprecated since 3.12
+	// It got removed in 3.98: https://github.com/GNOME/gtk/blob/main/NEWS.pre-4.0#L939
+	// Our minimum GTK support needed is 3.10 (Ubuntu 14.04)
+	settingsPage.SetMarginLeft(12)
+	settingsPage.SetMarginRight(12)
 	settingsPage.SetMarginBottom(12)
 
 	/* Dictionary Match Exact Preference */
@@ -326,8 +329,8 @@ func makeRLWPage() *gtk.Box {
 	rlwPage, err := gtk.BoxNew(gtk.ORIENTATION_VERTICAL, 6)
 	checkError(err)
 
-	rlwPage.SetMarginStart(12)
-	rlwPage.SetMarginEnd(12)
+	rlwPage.SetMarginLeft(12)
+	rlwPage.SetMarginRight(12)
 	rlwPage.SetMarginTop(12)
 	rlwPage.SetMarginBottom(12)
 
@@ -406,9 +409,6 @@ func showPrefs() {
 		return
 	}
 
-	mainWin.SetDefaultSize(640, 480)
-	mainWin.SetResizable(false)
-	mainWin.SetPosition(gtk.WIN_POS_CENTER)
 	mainWin.SetTitle("Varnam " + varnam.GetSchemeDetails().DisplayName + " Preferences (" + engineName + ")")
 	mainWin.Connect("destroy", func() {
 		gtk.MainQuit()
@@ -419,8 +419,8 @@ func showPrefs() {
 
 	notebook.SetScrollable(true)
 
-	notebook.SetMarginStart(12)
-	notebook.SetMarginEnd(12)
+	notebook.SetMarginLeft(12)
+	notebook.SetMarginRight(12)
 	notebook.SetMarginBottom(12)
 
 	settingsLabel, err := gtk.LabelNew("Settings")
@@ -433,12 +433,9 @@ func showPrefs() {
 
 	win.Add(notebook)
 
-	settingsPage, err := gtk.BoxNew(gtk.ORIENTATION_VERTICAL, 6)
-	checkError(err)
-
-	settingsPage.SetMarginStart(12)
-	settingsPage.SetMarginEnd(12)
-	settingsPage.SetMarginBottom(12)
+	mainWin.SetSizeRequest(640, 480)
+	mainWin.SetResizable(true)
+	mainWin.SetPosition(gtk.WIN_POS_CENTER)
 
 	// Recursively show all widgets contained in this window.
 	mainWin.ShowAll()