diff --git a/icu4c/source/aclocal.m4 b/icu4c/source/aclocal.m4
index 540a4209924..f2bc0193508 100644
--- a/icu4c/source/aclocal.m4
+++ b/icu4c/source/aclocal.m4
@@ -22,6 +22,7 @@ case "${host}" in
 *-*-linux*) 	icu_cv_host_frag=$srcdir/config/mh-linux ;;
 *-*-freebsd*) 	icu_cv_host_frag=$srcdir/config/mh-freebsd ;;
 *-*-aix*) 	icu_cv_host_frag=$srcdir/config/mh-aix ;;
+*-sequent-*) 	icu_cv_host_frag=$srcdir/config/mh-ptx ;;
 *-*-hpux*)
 	case "$CXX" in 
 	*aCC)    icu_cv_host_frag=$srcdir/config/mh-hpux-acc ;;
diff --git a/icu4c/source/config/mh-ptx b/icu4c/source/config/mh-ptx
new file mode 100644
index 00000000000..f441b51481e
--- /dev/null
+++ b/icu4c/source/config/mh-ptx
@@ -0,0 +1,56 @@
+## -*-makefile-*-
+## PTX-specific setup
+## Copyright (c) 1999-2000, International Business Machines Corporation and
+## others. All Rights Reserved.
+
+## Commands to generate dependency files
+GEN_DEPS.c=	$(CC) -Kthread -KPIC -c $(DEFS) $(CPPFLAGS)
+GEN_DEPS.cc=	$(CXX) -M $(DEFS) $(CPPFLAGS)
+
+## Commands to compile
+COMPILE.c=	$(CC) -Kthread -KPIC $(DEFS) $(CPPFLAGS) $(CFLAGS) -c
+COMPILE.cc=	$(CXX) -Kthread -KPIC $(DEFS) $(CPPFLAGS) $(CXXFLAGS) -c
+
+## Commands to link
+#LINK.c=		$(CC) $(DEFS) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS)
+LINK.c=		$(CXX) $(DEFS) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -lm -lgen
+LINK.cc=	$(CXX) $(DEFS) $(CPPFLAGS) $(CXXFLAGS) $(LDFLAGS) -lm -lgen
+
+## Commands to make a shared library
+SHLIB.c=	$(CC) $(DEFS) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -DPTX -G
+SHLIB.cc=	$(CXX) $(DEFS) $(CPPFLAGS) $(CXXFLAGS) $(LDFLAGS) -DPTX -G
+
+## Compiler switch to embed a runtime search path
+LD_RPATH=	-R	
+LD_RPATH_PRE=
+
+## Shared object suffix
+SO=		so
+
+## Link commands to link to ICU libs
+LIBICU-UC= 	-L$(top_builddir)/common -licu-uc
+LIBICU-I18N= 	-L$(top_builddir)/i18n -licu-i18n
+LIBCTESTFW= 	-L$(top_builddir)/tools/ctestfw -lctestfw
+LIBICU-TOOLUTIL=-L$(top_builddir)/tools/toolutil -licu-toolutil
+
+## Compilation rules
+%.o : $(srcdir)/%.c
+	$(COMPILE.c) -o $@ $<
+
+%.o : $(srcdir)/%.cpp
+	$(COMPILE.cc) -o $@ $<
+
+## Dependency rules
+%.d : $(srcdir)/%.c
+	@echo "Generating dependency information for $<"
+	@$(SHELL) -ec '$(GEN_DEPS.c) $< \
+		| sed '\''s/\($*\)\.o[ :]*/\1.o $@ : /g'\'' > $@; \
+		[ -s $@ ] || rm -f $@'
+
+%.d : $(srcdir)/%.cpp
+	@echo "Generating dependency information for $<"
+	@$(SHELL) -ec '$(GEN_DEPS.cc) -o $@ $< \
+		| sed '\''s/\($*\)\.o[ :]*/\1.o $@ : /g'\'' > $@; \
+		[ -s $@ ] || rm -f $@'
+
+## End Ptx-specific setup
diff --git a/icu4c/source/configure b/icu4c/source/configure
index 5c8f98321b0..05d995a2f1b 100755
--- a/icu4c/source/configure
+++ b/icu4c/source/configure
@@ -2687,6 +2687,7 @@ case "${host}" in
 	*-*-linux*) 	platform=LINUX ;;
 	*-*-freebsd*) 	platform=LINUX ;;
 	*-*-aix*) 	platform=AIX ;;
+	*-sequent-*) 	platform=PTX ;;
 	*-*-hpux*) 	platform=HPUX ;;
 	*-*-irix*)      platform=IRIX ;;
 	*-*-os390*)	platform=OS390 ;;
@@ -2702,6 +2703,7 @@ case "${host}" in
 	*-*-linux*) 	ld_rpath_suf=" " ;;
 	*-*-freebsd*) 	ld_rpath_suf=" " ;;
 	*-*-aix*) 	ld_rpath_suf="" ;;
+	*-sequent-*) 	ld_rpath_suf="" ;;
 	*-*-hpux*) 	ld_rpath_suf=":" ;;
 	*-*-irix*)      ld_rpath_suf=" " ;;
 	*-*-os390*)	ld_rpath_suf="" ;;
diff --git a/icu4c/source/runConfigureICU b/icu4c/source/runConfigureICU
index 04d8307d7fa..9b67785f30b 100755
--- a/icu4c/source/runConfigureICU
+++ b/icu4c/source/runConfigureICU
@@ -19,6 +19,7 @@ usage()
     echo "          8. 'HP/UX11ACC' if you are using Advanced C++ compiler on HP-UX11"
     echo "          9. 'AIX4.3xlC' if you are using xlC on AIX4.3"
     echo "          10. 'SOL2.7CC'if you are using native CC compiler on Solaris"
+    echo "          11. 'PTX' if you are using c++ on Dynix/PTX v4.5"
 
  }
 
@@ -95,6 +96,14 @@ case $platform in
                 CC=cc; export CC
 				CXX=/opt/aCC/bin/aCC; export CXX
 			    ./configure;;
+        PTX)
+                echo Running configure for PTX using c++ compiler ...
+                CC=cc; export CC
+				CXX=c++; export CXX
+		if test ${XMLINSTALL}o = "o"; then 
+			XMLINSTALL=/usr/local; export XMLINSTALL
+		fi
+			    ./configure --prefix=$XMLINSTALL;;
         *)
                 echo I do not recognize the option \"$platform\". Please type ${0} -h for help.
                 exit 0;;