diff --git a/README.md b/README.md
index 21d8173..85bea90 100644
--- a/README.md
+++ b/README.md
@@ -260,7 +260,7 @@ Bash ships with a bison pre-generated file here which we delete. Unfortunately,
 we have not bootstrapped bison but fortunately for us, heirloom yacc is able to
 cope here.
 
-#### Part 21: m4 1.4
+#### Part 21: m4 1.4.4
 
 `m4` is the first piece of software we need in the autotools suite and flex 2.6.4.
 It allows macros to be defined and files to be generated from those macros.
diff --git a/rootfs.sh b/rootfs.sh
index e39d40c..3546ffe 100755
--- a/rootfs.sh
+++ b/rootfs.sh
@@ -130,8 +130,8 @@ get_file http://downloads.sourceforge.net/project/heirloom/heirloom-devtools/070
 # bash 2.05b
 get_file https://ftp.gnu.org/pub/gnu/bash/bash-2.05b.tar.gz
 
-# m4 1.4
-get_file https://ftp.gnu.org/gnu/m4/m4-1.4.tar.gz
+# m4 1.4.4
+get_file https://ftp.gnu.org/gnu/m4/m4-1.4.4.tar.gz
 
 # flex 2.5.11
 get_file http://download.nust.na/pub2/openpkg1/sources/DST/flex/flex-2.5.11.tar.gz
diff --git a/sysa/grep-2.4/mk/main.mk b/sysa/grep-2.4/mk/main.mk
index c35d91b..09de660 100644
--- a/sysa/grep-2.4/mk/main.mk
+++ b/sysa/grep-2.4/mk/main.mk
@@ -8,7 +8,9 @@ AR      = tcc -ar
 CFLAGS  = -DPACKAGE=\"$(PACKAGE)\" \
           -DVERSION=\"$(VERSION)\" \
           -DHAVE_DIRENT_H=1 \
-          -DHAVE_UNISTD_H=1
+          -DHAVE_UNISTD_H=1 \
+          -DHAVE_STRERROR=1 \
+          -DREGEX_MALLOC=1
 
 .PHONY: all
 
diff --git a/sysa/m4-1.4/mk/main.mk b/sysa/m4-1.4.4/mk/main.mk
similarity index 83%
rename from sysa/m4-1.4/mk/main.mk
rename to sysa/m4-1.4.4/mk/main.mk
index a47d196..72c4176 100644
--- a/sysa/m4-1.4/mk/main.mk
+++ b/sysa/m4-1.4.4/mk/main.mk
@@ -7,7 +7,9 @@ AR      = tcc -ar
 
 CFLAGS  = -I lib \
           -DPRODUCT=\"$(PRODUCT)\" \
-          -DVERSION=\"$(VERSION)\"
+          -DVERSION=\"$(VERSION)\" \
+          -DHAVE_SIGNAL_H=1 \
+          -DPACKAGE_STRING=\"GNU\ M4\ 1.4.4\"
 
 LDFLAGS = -L . -lm4
 
diff --git a/sysa/m4-1.4/patches/signal-include.patch b/sysa/m4-1.4/patches/signal-include.patch
deleted file mode 100644
index c027475..0000000
--- a/sysa/m4-1.4/patches/signal-include.patch
+++ /dev/null
@@ -1,15 +0,0 @@
-sys/signal.h is not the POSIX appropriate place for signal.h, which mes libc
-attempts to conform to.
-
-diff -r -U3 src/m4.c src/m4.c
---- src/m4.c	1994-11-02 03:14:28.000000000 +0000
-+++ src/m4.c	2021-01-15 00:19:21.947654461 +0000
-@@ -19,7 +19,7 @@
- #include "m4.h"
- 
- #include <getopt.h>
--#include <sys/signal.h>
-+#include <signal.h>
- 
- static void usage _((int));
- 
diff --git a/sysa/run.sh b/sysa/run.sh
index 6e3d750..b3cd7a4 100755
--- a/sysa/run.sh
+++ b/sysa/run.sh
@@ -10,7 +10,7 @@ set -e
 export PREFIX=/after
 
 # Part 21
-build m4-1.4
+build m4-1.4.4
 
 # Part 22
 build flex-2.5.11