diff --git a/net-misc/shigofumi/files/shigofumi-0.3-gcc-10.patch b/net-misc/shigofumi/files/shigofumi-0.3-gcc-10.patch
new file mode 100644
index 0000000000000..52688ff1d194d
--- /dev/null
+++ b/net-misc/shigofumi/files/shigofumi-0.3-gcc-10.patch
@@ -0,0 +1,11 @@
+--- a/src/shigofumi.h
++++ b/src/shigofumi.h
+@@ -16,7 +16,7 @@
+ extern shi_state state;*/
+ 
+ /* UI */
+-FILE *output;
++extern FILE *output;
+ 
+ /* Data */
+ extern struct isds_list *boxes;
diff --git a/net-misc/shigofumi/shigofumi-0.3-r1.ebuild b/net-misc/shigofumi/shigofumi-0.3-r1.ebuild
index 8667bb035c0cb..a5dcea0425c70 100644
--- a/net-misc/shigofumi/shigofumi-0.3-r1.ebuild
+++ b/net-misc/shigofumi/shigofumi-0.3-r1.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2019 Gentoo Authors
+# Copyright 1999-2020 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=6
@@ -36,6 +36,10 @@ DEPEND="${RDEPEND}
 	nls? ( sys-devel/gettext )
 "
 
+PATCHES=(
+	"${FILESDIR}"/${P}-gcc-10.patch
+)
+
 src_prepare() {
 	default
 	[[ ${PV} = 9999* ]] && eautoreconf