diff --git a/libf2c/ChangeLog b/libf2c/ChangeLog
index 672ebbced28e..58cf351eac76 100644
--- a/libf2c/ChangeLog
+++ b/libf2c/ChangeLog
@@ -1,3 +1,10 @@
+Mon Nov 23 16:52:22 1998  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
+
+	*  configure.in: Use AC_PREREQ(2.12.1).
+	*  libF77/configure.in: Likewise.
+	*  libI77/configure.in: Likewise.
+	*  libU77/configure.in: Likewise.
+
 1998-10-24  Dave Love  <d.love@dl.ac.uk>
 
 	* configure.in: Touch g2c.h in AC_OUTPUT after multilib
diff --git a/libf2c/configure.in b/libf2c/configure.in
index dbe069a11e55..1362431bbca4 100644
--- a/libf2c/configure.in
+++ b/libf2c/configure.in
@@ -19,6 +19,7 @@
 #the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
 #02111-1307, USA.
 
+AC_PREREQ(2.12.1)
 AC_INIT(libF77/Version.c)
 
 if test "${srcdir}" = "."  ; then
diff --git a/libf2c/libF77/configure.in b/libf2c/libF77/configure.in
index 660fb1a29add..5a3aa1a8d83f 100644
--- a/libf2c/libF77/configure.in
+++ b/libf2c/libF77/configure.in
@@ -19,6 +19,7 @@
 #the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
 #02111-1307, USA.
 
+AC_PREREQ(2.12.1)
 AC_INIT(getarg_.c)
 
 dnl Checks for programs.
diff --git a/libf2c/libI77/configure.in b/libf2c/libI77/configure.in
index e5fc32d199f7..2b3483093f4f 100644
--- a/libf2c/libI77/configure.in
+++ b/libf2c/libI77/configure.in
@@ -19,6 +19,7 @@
 #the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
 #02111-1307, USA.
 
+AC_PREREQ(2.12.1)
 AC_INIT(ftell_.c)
 
 dnl Checks for programs.
diff --git a/libf2c/libU77/configure.in b/libf2c/libU77/configure.in
index 2e6e608c04e5..58b8de315862 100644
--- a/libf2c/libU77/configure.in
+++ b/libf2c/libU77/configure.in
@@ -19,6 +19,7 @@
 #to Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307,
 #USA.
 
+AC_PREREQ(2.12.1)
 AC_INIT(access_.c)
 AC_CONFIG_HEADER(config.h:config.hin)