diff --git a/deps/murrine/gtk-murrine-engine-c99.patch b/deps/murrine/gtk-murrine-engine-c99.patch
new file mode 100644
index 0000000..91fd27c
--- /dev/null
+++ b/deps/murrine/gtk-murrine-engine-c99.patch
@@ -0,0 +1,37 @@
+Add a few missing function prototypes, to avoid future build failures once
+compilers start to reject implicit function declarations by default.
+
+diff -ur murrine-0.98.2.orig/src/murrine_rc_style.h murrine-0.98.2/src/murrine_rc_style.h
+--- murrine-0.98.2.orig/src/murrine_rc_style.h	2012-01-17 18:46:01.000000000 +0100
++++ murrine-0.98.2/src/murrine_rc_style.h	2022-12-14 21:33:03.242067429 +0100
+@@ -154,5 +154,6 @@
+ };
+ 
+ GType murrine_rc_style_get_type	(void);
++void murrine_rc_style_register_types (GTypeModule *module);
+ 
+ #endif /* MURRINE_RC_STYLE_H */
+diff -ur murrine-0.98.2.orig/src/murrine_style.h murrine-0.98.2/src/murrine_style.h
+--- murrine-0.98.2.orig/src/murrine_style.h	2012-01-17 18:46:01.000000000 +0100
++++ murrine-0.98.2/src/murrine_style.h	2022-12-14 21:33:41.604671684 +0100
+@@ -102,5 +102,6 @@
+ };
+ 
+ GType murrine_style_get_type (void);
++void murrine_style_register_types (GTypeModule *module);
+ 
+ #endif /* MURRINE_STYLE_H */
+diff -ur murrine-0.98.2.orig/src/support.h murrine-0.98.2/src/support.h
+--- murrine-0.98.2.orig/src/support.h	2012-01-17 18:46:01.000000000 +0100
++++ murrine-0.98.2/src/support.h	2022-12-14 21:27:27.288533100 +0100
+@@ -118,6 +118,10 @@
+ 
+ #define MRN_WIDGET_HAS_DEFAULT(object) ((object) && MRN_IS_WIDGET(object) && GTK_WIDGET_HAS_DEFAULT(object))
+ 
++gboolean murrine_object_is_a (const GObject * object, const gchar * type_name);
++gboolean murrine_widget_is_ltr (GtkWidget *widget);
++
++
+ G_GNUC_INTERNAL GtkTextDirection murrine_get_direction (GtkWidget *widget);
+ G_GNUC_INTERNAL GtkWidget *murrine_special_get_ancestor (GtkWidget *widget, GType widget_type);
+ G_GNUC_INTERNAL GdkColor* murrine_get_parent_bgcolor (GtkWidget *widget);
diff --git a/deps/murrine/murrine.SlackBuild b/deps/murrine/murrine.SlackBuild
index 50e780e..108bc29 100644
--- a/deps/murrine/murrine.SlackBuild
+++ b/deps/murrine/murrine.SlackBuild
@@ -25,7 +25,7 @@
 
 PRGNAM=murrine
 VERSION=${VERSION:-0.98.2}
-BUILD=${BUILD:-1}
+BUILD=${BUILD:-2}
 TAG=${TAG:-_msb}
 
 if [ -z "$ARCH" ]; then
@@ -83,6 +83,8 @@ if [ "$ARCH" = "aarch64" ]; then
   patch -p1 < $CWD/config.sub-add-aarch64-support.patch
 fi
 
+patch -p1 < $CWD/gtk-murrine-engine-c99.patch
+
 CFLAGS="$SLKCFLAGS" \
 CXXFLAGS="$SLKCFLAGS" \
 ./configure \