diff --git a/pkgs/by-name/gn/gnum4/loong-fix-build.patch b/pkgs/by-name/gn/gnum4/loong-fix-build.patch
deleted file mode 100644
index d5243357928b3..0000000000000
--- a/pkgs/by-name/gn/gnum4/loong-fix-build.patch
+++ /dev/null
@@ -1,30 +0,0 @@
-[xen0n: this is https://github.com/sunhaiyong1978/CLFS-for-LoongArch/blob/1.0/patches/stack-direction-add-loongarch.patch with line number tweak, and change to generated file added as well.]
-From: Sun Haiyong <youbest@sina.com>
-Date: Tue, 31 Aug 2021 11:11:52 +0800
-Subject: [PATCH] stack-direction: Add support for loongarch CPU
-
-* m4/stack-direction.m4 (SV_STACK_DIRECTION): When the CPU is loongarch,
-set "sv_cv_stack_direction" to "-1" .
---- a/m4/stack-direction.m4
-+++ b/m4/stack-direction.m4
-@@ -31,6 +31,7 @@ AC_DEFUN([SV_STACK_DIRECTION],
-       i?86 | x86_64 | \
-       i860 | \
-       ia64 | \
-+      loongarch* | \
-       m32r | \
-       m68* | \
-       m88k | \
---- a/configure
-+++ b/configure
-@@ -46399,6 +46399,7 @@ else $as_nop
-       i?86 | x86_64 | \
-       i860 | \
-       ia64 | \
-+      loongarch* | \
-       m32r | \
-       m68* | \
-       m88k | \
--- 
-2.17.2
-
diff --git a/pkgs/by-name/gn/gnum4/package.nix b/pkgs/by-name/gn/gnum4/package.nix
index 1b264ffc1290f..991acc179af0a 100644
--- a/pkgs/by-name/gn/gnum4/package.nix
+++ b/pkgs/by-name/gn/gnum4/package.nix
@@ -11,15 +11,13 @@
 
 stdenv.mkDerivation rec {
   pname = "gnum4";
-  version = "1.4.19";
+  version = "1.4.20";
 
   src = fetchurl {
     url = "mirror://gnu/m4/m4-${version}.tar.bz2";
-    sha256 = "sha256-swapHA/ZO8QoDPwumMt6s5gf91oYe+oyk4EfRSyJqMg=";
+    hash = "sha256-rGmJ7l0q7YFzl4BjDMLOCX4qZUb+uWpKVNs31GoUUuQ=";
   };
 
-  # https://gitweb.gentoo.org/repo/gentoo.git/tree/sys-devel/m4/m4-1.4.19-r1.ebuild
-  patches = lib.optional stdenv.hostPlatform.isLoongArch64 ./loong-fix-build.patch;
   # this could be accomplished by updateAutotoolsGnuConfigScriptsHook, but that causes infinite recursion
   # necessary for FreeBSD code path in configure
   postPatch =