diff --git a/configure b/configure
index ad33c34e7c9..1c253bc14aa 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in Revision: 1.411 .
+# From configure.in Revision: 1.412 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.53 for python 2.3.
 #
@@ -3648,6 +3648,9 @@ yes)
     OpenUNIX*|UnixWare*)
 	BASECFLAGS="$BASECFLAGS -K pentium,host,inline,loop_unroll,alloca "
 	;;
+    OSF*)
+	BASECFLAGS="$BASECFLAGS -ieee -std"
+    	;;
     SCO_SV*)
 	BASECFLAGS="$BASECFLAGS -belf -Ki486 -DSCO5"
 	;;
diff --git a/configure.in b/configure.in
index aae3eca8024..4d3af9d1943 100644
--- a/configure.in
+++ b/configure.in
@@ -646,6 +646,9 @@ yes)
     OpenUNIX*|UnixWare*)
 	BASECFLAGS="$BASECFLAGS -K pentium,host,inline,loop_unroll,alloca "
 	;;
+    OSF*)
+	BASECFLAGS="$BASECFLAGS -ieee -std"
+    	;;
     SCO_SV*)
 	BASECFLAGS="$BASECFLAGS -belf -Ki486 -DSCO5"
 	;;