diff --git a/x11/kde/arts3/Makefile b/x11/kde/arts3/Makefile
index 046f2ab46fc..074a9a8cf3b 100644
--- a/x11/kde/arts3/Makefile
+++ b/x11/kde/arts3/Makefile
@@ -1,9 +1,9 @@
-# $OpenBSD: Makefile,v 1.89 2019/06/08 15:25:57 jca Exp $
+# $OpenBSD: Makefile,v 1.90 2020/04/15 15:24:31 cwen Exp $
 
 COMMENT =		K Desktop Environment, aRTs
 CATEGORIES =		x11 x11/kde
 VERSION =		3.5.10
-REVISION =		16
+REVISION =		17
 DISTNAME =		arts-1.5.10
 MODKDE_VERSION =	3.5.8
 
@@ -50,5 +50,5 @@ COMPILER =		base-clang ports-gcc base-gcc
 
 post-patch:
 	cp ${FILESDIR}/audioiosndio.cc ${WRKSRC}/flow
-		
+
 .include <bsd.port.mk>
diff --git a/x11/kde/arts3/patches/patch-flow_gsl_gslglib_h b/x11/kde/arts3/patches/patch-flow_gsl_gslglib_h
new file mode 100644
index 00000000000..49c520c5a35
--- /dev/null
+++ b/x11/kde/arts3/patches/patch-flow_gsl_gslglib_h
@@ -0,0 +1,23 @@
+$OpenBSD: patch-flow_gsl_gslglib_h,v 1.1 2020/04/15 15:24:31 cwen Exp $
+
+Pointless #ifdef hell that breaks with clang on powerpc,
+va_copy was introduced in C99
+
+Index: flow/gsl/gslglib.h
+--- flow/gsl/gslglib.h.orig
++++ flow/gsl/gslglib.h
+@@ -505,13 +505,7 @@ gboolean g_path_is_absolute (const gchar *file_name);
+  * glibconfig.h may have already defined G_VA_COPY as va_copy or __va_copy.
+  */
+ #if !defined (G_VA_COPY)
+-#  if defined (__GNUC__) && ( defined (__PPC__) || defined (__s390__) ) && (defined (_CALL_SYSV) || defined (_WIN32) || defined (__s390__) )
+-#    define G_VA_COPY(ap1, ap2)   (*(ap1) = *(ap2))
+-#  elif defined (G_VA_COPY_AS_ARRAY)
+-#    define G_VA_COPY(ap1, ap2)   g_memmove ((ap1), (ap2), sizeof (va_list))
+-#  else /* va_list is a pointer */
+-#    define G_VA_COPY(ap1, ap2)   ((ap1) = (ap2))
+-#  endif /* va_list is a pointer */
++#  define G_VA_COPY va_copy
+ #endif /* !G_VA_COPY */
+ 
+ 
diff --git a/x11/kde/arts3/patches/patch-mcop_debug_cc b/x11/kde/arts3/patches/patch-mcop_debug_cc
new file mode 100644
index 00000000000..f97aacdf95f
--- /dev/null
+++ b/x11/kde/arts3/patches/patch-mcop_debug_cc
@@ -0,0 +1,23 @@
+$OpenBSD: patch-mcop_debug_cc,v 1.1 2020/04/15 15:24:31 cwen Exp $
+
+Pointless #ifdef hell that breaks with clang on powerpc,
+va_copy was introduced in C99
+
+Index: mcop/debug.cc
+--- mcop/debug.cc.orig
++++ mcop/debug.cc
+@@ -381,13 +381,7 @@ typedef struct _GString GString;
+  * glibconfig.h may have already defined G_VA_COPY as va_copy or __va_copy.
+  */
+ #if !defined (G_VA_COPY)
+-#  if defined (__GNUC__) && defined (__PPC__) && (defined (_CALL_SYSV) || defined (_WIN32) || defined(WIN32)) || defined(__s390__) || defined(__x86_64__)
+-#    define G_VA_COPY(ap1, ap2)   (*(ap1) = *(ap2))
+-#  elif defined (G_VA_COPY_AS_ARRAY)
+-#    define G_VA_COPY(ap1, ap2)   g_memmove ((ap1), (ap2), sizeof (va_list))
+-#  else /* va_list is a pointer */
+-#    define G_VA_COPY(ap1, ap2)   ((ap1) = (ap2))
+-#  endif /* va_list is a pointer */
++#  define G_VA_COPY va_copy
+ #endif /* !G_VA_COPY */
+ 
+ /* --- glib macros --- */