diff --git a/srcpkgs/pdfpc/patches/ftbfs.patch b/srcpkgs/pdfpc/patches/ftbfs.patch
new file mode 100644
index 00000000000..250b60808d8
--- /dev/null
+++ b/srcpkgs/pdfpc/patches/ftbfs.patch
@@ -0,0 +1,79 @@
+From bbc16b97ecbdcdd22c2dc827a5c0e8b569073312 Mon Sep 17 00:00:00 2001
+From: Evgeny Stambulchik <fnevgeny@gmail.com>
+Date: Sun, 4 Aug 2019 13:13:48 +0300
+Subject: [PATCH] Make constructors of abstract classes protected
+
+This should fix #445.
+---
+ src/classes/action/action_mapping.vala | 2 +-
+ src/classes/drawings/storage.vala      | 2 +-
+ src/classes/renderer/cache/base.vala   | 2 +-
+ src/classes/timer_label.vala           | 2 +-
+ src/classes/view/behaviour/base.vala   | 2 +-
+ 5 files changed, 5 insertions(+), 5 deletions(-)
+
+diff --git a/src/classes/action/action_mapping.vala b/src/classes/action/action_mapping.vala
+index 780f80a..0abc307 100644
+--- src/classes/action/action_mapping.vala
++++ src/classes/action/action_mapping.vala
+@@ -48,7 +48,7 @@ namespace pdfpc {
+          * methods, and we need blank objects to call them.  Thus, this blank
+          * constructor.
+          */
+-        public ActionMapping() {
++        protected ActionMapping() {
+             base();
+         }
+ 
+diff --git a/src/classes/drawings/storage.vala b/src/classes/drawings/storage.vala
+index 93f85a9..373279e 100644
+--- src/classes/drawings/storage.vala
++++ src/classes/drawings/storage.vala
+@@ -35,7 +35,7 @@ namespace pdfpc.Drawings.Storage {
+          */
+         protected Metadata.Pdf metadata;
+ 
+-        public Base(Metadata.Pdf metadata) {
++        protected Base(Metadata.Pdf metadata) {
+             this.metadata = metadata;
+         }
+ 
+diff --git a/src/classes/renderer/cache/base.vala b/src/classes/renderer/cache/base.vala
+index 3c4aea0..043a60f 100644
+--- src/classes/renderer/cache/base.vala
++++ src/classes/renderer/cache/base.vala
+@@ -37,7 +37,7 @@ namespace pdfpc.Renderer.Cache {
+         /**
+          * Initialize the cache store
+          */
+-        public Base(Metadata.Pdf metadata) {
++        protected Base(Metadata.Pdf metadata) {
+             this.metadata = metadata;
+         }
+ 
+diff --git a/src/classes/timer_label.vala b/src/classes/timer_label.vala
+index 8b55acc..8d689e1 100644
+--- src/classes/timer_label.vala
++++ src/classes/timer_label.vala
+@@ -95,7 +95,7 @@ namespace pdfpc {
+          * Default constructor taking the initial time as argument, as well as
+          * the time to countdown until the talk actually starts.
+          */
+-        public TimerLabel(PresentationController controller, time_t start_time = 0) {
++        protected TimerLabel(PresentationController controller, time_t start_time = 0) {
+             this.controller = controller;
+             this.start_time = start_time;
+         }
+diff --git a/src/classes/view/behaviour/base.vala b/src/classes/view/behaviour/base.vala
+index 4382ba6..46c8808 100644
+--- src/classes/view/behaviour/base.vala
++++ src/classes/view/behaviour/base.vala
+@@ -41,7 +41,7 @@ namespace pdfpc.View {
+         /**
+          * Base constructor not taking any arguments
+          */
+-        public Base() {
++        protected Base() {
+             // Nothing to do here
+         }
+