Index: /issm/trunk-jpl/externalpackages/autotools/install-linux.sh
===================================================================
--- /issm/trunk-jpl/externalpackages/autotools/install-linux.sh	(revision 26426)
+++ /issm/trunk-jpl/externalpackages/autotools/install-linux.sh	(revision 26427)
@@ -8,5 +8,5 @@
 AUTOMAKE_VER="1.16.1"
 LIBTOOL_VER="2.4.2"
-M4_VER="1.4.18"
+M4_VER="1.4.19"
 
 PREFIX="${ISSM_DIR}/externalpackages/autotools/install" # Set to location where external package should be installed
Index: /issm/trunk-jpl/externalpackages/autotools/install-mac.sh
===================================================================
--- /issm/trunk-jpl/externalpackages/autotools/install-mac.sh	(revision 26426)
+++ /issm/trunk-jpl/externalpackages/autotools/install-mac.sh	(revision 26427)
@@ -8,5 +8,5 @@
 AUTOMAKE_VER="1.16.1"
 LIBTOOL_VER="2.4.2"
-M4_VER="1.4.18"
+M4_VER="1.4.19"
 
 PREFIX="${ISSM_DIR}/externalpackages/autotools/install" # Set to location where external package should be installed
Index: /issm/trunk-jpl/externalpackages/autotools/install-win.sh
===================================================================
--- /issm/trunk-jpl/externalpackages/autotools/install-win.sh	(revision 26426)
+++ /issm/trunk-jpl/externalpackages/autotools/install-win.sh	(revision 26427)
@@ -9,5 +9,5 @@
 AUTOMAKE_VER="${AUTOMAKE_MIN_VER}.1"
 LIBTOOL_VER="2.4.2"
-M4_VER="1.4.18"
+M4_VER="1.4.19"
 
 PREFIX="${ISSM_DIR}/externalpackages/autotools/install" # Set to location where external package should be installed