diff --git a/Misc/ACKS b/Misc/ACKS
index 2606dff..57b85e5 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -189,6 +189,7 @@
 Stephen D Evans
 Tim Everett
 Paul Everitt
+David Everly
 Greg Ewing
 Martijn Faassen
 Andreas Faerber
diff --git a/Misc/NEWS b/Misc/NEWS
index 679bd30..4f9083c 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -81,6 +81,8 @@
 Build
 -----
 
+- Bug/Patch #1481770: Use .so extension for shared libraries on HP-UX for ia64.
+
 - Patch #1471883: Add --enable-universalsdk.
 
 C API
diff --git a/configure b/configure
index f829580..8676dab 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in Revision: 45995 .
+# From configure.in Revision: 46010 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.59 for python 2.5.
 #
@@ -3387,7 +3387,14 @@
 	  INSTSONAME="$LDLIBRARY".$SOVERSION
 	  ;;
     hp*|HP*)
-	  LDLIBRARY='libpython$(VERSION).sl'
+	  case `uname -m` in
+		ia64)
+			LDLIBRARY='libpython$(VERSION).so'
+			;;
+		*)
+			LDLIBRARY='libpython$(VERSION).sl'
+			;;
+	  esac
 	  BLDLIBRARY='-Wl,+b,$(LIBDIR) -L. -lpython$(VERSION)'
 	  RUNSHARED=SHLIB_PATH=`pwd`:${SHLIB_PATH}
 	  ;;
@@ -10869,7 +10876,12 @@
 if test -z "$SO"
 then
 	case $ac_sys_system in
-	hp*|HP*)   SO=.sl;;
+	hp*|HP*)
+		case `uname -m` in
+			ia64) SO=.so;;
+	  		*)    SO=.sl;;
+		esac
+		;;
 	CYGWIN*)   SO=.dll;;
 	*)	   SO=.so;;
 	esac
@@ -10887,6 +10899,11 @@
 fi
 echo "$as_me:$LINENO: result: $SO" >&5
 echo "${ECHO_T}$SO" >&6
+
+cat >>confdefs.h <<_ACEOF
+#define SHLIB_EXT "$SO"
+_ACEOF
+
 # LDSHARED is the ld *command* used to create shared library
 # -- "cc -G" on SunOS 5.x, "ld -shared" on IRIX 5
 # (Shared libraries in this instance are shared modules to be loaded into
diff --git a/configure.in b/configure.in
index 26c881f..a7c50bd 100644
--- a/configure.in
+++ b/configure.in
@@ -611,7 +611,14 @@
 	  INSTSONAME="$LDLIBRARY".$SOVERSION
 	  ;;
     hp*|HP*)
-	  LDLIBRARY='libpython$(VERSION).sl'
+	  case `uname -m` in
+		ia64)
+			LDLIBRARY='libpython$(VERSION).so'
+			;;
+		*)
+			LDLIBRARY='libpython$(VERSION).sl'
+			;;
+	  esac
 	  BLDLIBRARY='-Wl,+b,$(LIBDIR) -L. -lpython$(VERSION)'
 	  RUNSHARED=SHLIB_PATH=`pwd`:${SHLIB_PATH}
 	  ;;
@@ -1359,7 +1366,12 @@
 if test -z "$SO"
 then
 	case $ac_sys_system in
-	hp*|HP*)   SO=.sl;;
+	hp*|HP*)
+		case `uname -m` in
+			ia64) SO=.so;;
+	  		*)    SO=.sl;;
+		esac
+		;;
 	CYGWIN*)   SO=.dll;;
 	*)	   SO=.so;;
 	esac
@@ -1376,6 +1388,7 @@
 	sleep 10
 fi
 AC_MSG_RESULT($SO)
+AC_DEFINE_UNQUOTED(SHLIB_EXT, "$SO", [Define this to be extension of shared libraries (including the dot!).])
 # LDSHARED is the ld *command* used to create shared library
 # -- "cc -G" on SunOS 5.x, "ld -shared" on IRIX 5
 # (Shared libraries in this instance are shared modules to be loaded into
diff --git a/pyconfig.h.in b/pyconfig.h.in
index df3c1cd..1468bf6 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -754,6 +754,9 @@
 /* Define if setpgrp() must be called as setpgrp(0, 0). */
 #undef SETPGRP_HAVE_ARG
 
+/* Define this to be extension of shared libraries (including the dot!). */
+#undef SHLIB_EXT
+
 /* Define if i>>j for signed int i does not extend the sign bit when i < 0 */
 #undef SIGNED_RIGHT_SHIFT_ZERO_FILLS