diff --git a/Makefile.in b/Makefile.in
index 5e1a59a3d..0e385ea58 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -41,6 +41,12 @@ MODE=regular
 # in order to get a more automatic version stamp as well.
 VERSION = 0.9.devel
 
+# This string is used as an installation suffix. It modifies certain
+# key install paths/files such that a build and install of Icarus Verilog
+# with the same $(prefix) but a different $(suffix) will not interfere.
+# The normal configuratin leaves suffix empty
+suffix = @install_suffix@
+
 prefix = @prefix@
 exec_prefix = @exec_prefix@
 srcdir = @srcdir@
@@ -52,7 +58,9 @@ VPATH = $(srcdir)
 
 bindir = @bindir@
 libdir = @libdir@
-includedir = @includedir@
+# This is actually the directory where we install our own header files.
+# It is a little different from the generic includedir.
+includedir = @includedir@/verilog$(suffix)
 mandir = @mandir@
 
 dllib=@DLLIB@
@@ -160,10 +168,11 @@ all: dep iverilog-vpi
 
 iverilog-vpi: iverilog-vpi.sh
 	sed -e 's;@SHARED@;@shared@;' -e 's;@PIC@;@PICFLAG@;' \
+	    -e 's;@SUFFIX@;$(suffix);' \
 	    -e 's;@IVCC@;$(CC);' \
 	    -e 's;@IVCXX@;$(CXX);' \
 	    -e 's;@IVCFLAGS@;$(CXXFLAGS);' \
-	    -e 's;@INCLUDEDIR@;@includedir@;' \
+	    -e 's;@INCLUDEDIR@;$(includedir);' \
 	    -e 's;@LIBDIR@;@libdir@;' $< > $@
 	chmod +x $@
 endif
@@ -229,43 +238,43 @@ version.h:
 
 ifeq (@MINGW32@,yes)
 ifeq ($(MAN),none)
-INSTALL_DOC = $(mandir)/man1/iverilog-vpi.1
+INSTALL_DOC = $(mandir)/man1/iverilog-vpi$(suffix).1
 else
 ifeq ($(PS2PDF),none)
-INSTALL_DOC = $(mandir)/man1/iverilog-vpi.1
+INSTALL_DOC = $(mandir)/man1/iverilog-vpi$(suffix).1
 else
-INSTALL_DOC = $(prefix)/iverilog-vpi.pdf $(mandir)/man1/iverilog-vpi.1
+INSTALL_DOC = $(prefix)/iverilog-vpi$(suffix).pdf $(mandir)/man1/iverilog-vpi$(suffix).1
 all: dep iverilog-vpi.pdf
 endif
 endif
 INSTALL_DOCDIR = $(mandir)/man1
 else
-INSTALL_DOC = $(mandir)/man1/iverilog-vpi.1
+INSTALL_DOC = $(mandir)/man1/iverilog-vpi$(suffix).1
 INSTALL_DOCDIR = $(mandir)/man1
 endif
 
 ifeq (@MINGW32@,yes)
-WIN32_INSTALL = $(prefix)/hello.vl $(prefix)/sqrt.vl $(prefix)/sqrt-virtex.v $(prefix)/QUICK_START.txt
+WIN32_INSTALL =
 else
-WIN32_INSTALL = $(bindir)/iverilog-vpi
+WIN32_INSTALL = $(bindir)/iverilog-vpi$(suffix)
 endif
 
-install: all installdirs $(libdir)/ivl/ivl@EXEEXT@  $(libdir)/ivl/include/constants.vams $(libdir)/ivl/include/disciplines.vams $(includedir)/ivl_target.h $(includedir)/_pli_types.h $(includedir)/vpi_user.h $(includedir)/acc_user.h $(includedir)/veriuser.h $(WIN32_INSTALL) $(INSTALL_DOC)
+install: all installdirs $(libdir)/ivl$(suffix)/ivl@EXEEXT@  $(libdir)/ivl$(suffix)/include/constants.vams $(libdir)/ivl$(suffix)/include/disciplines.vams $(includedir)/ivl_target.h $(includedir)/_pli_types.h $(includedir)/vpi_user.h $(includedir)/acc_user.h $(includedir)/veriuser.h $(WIN32_INSTALL) $(INSTALL_DOC)
 	for dir in $(SUBDIRS); do (cd $$dir ; $(MAKE) $@); done
 	for dir in vpi ivlpp driver; \
 	    do (cd $$dir ; $(MAKE) $@); done
 
-$(bindir)/iverilog-vpi: ./iverilog-vpi
-	$(INSTALL_SCRIPT) ./iverilog-vpi $(DESTDIR)$(bindir)/iverilog-vpi
+$(bindir)/iverilog-vpi$(suffix): ./iverilog-vpi
+	$(INSTALL_SCRIPT) ./iverilog-vpi $(DESTDIR)$(bindir)/iverilog-vpi$(suffix)
 
-$(libdir)/ivl/ivl@EXEEXT@: ./ivl@EXEEXT@
-	$(INSTALL_PROGRAM) ./ivl@EXEEXT@ $(DESTDIR)$(libdir)/ivl/ivl@EXEEXT@
+$(libdir)/ivl$(suffix)/ivl@EXEEXT@: ./ivl@EXEEXT@
+	$(INSTALL_PROGRAM) ./ivl@EXEEXT@ $(DESTDIR)$(libdir)/ivl$(suffix)/ivl@EXEEXT@
 
-$(libdir)/ivl/include/constants.vams: $(srcdir)/constants.vams
-	$(INSTALL_DATA) $(srcdir)/constants.vams $(DESTDIR)$(libdir)/ivl/include/constants.vams
+$(libdir)/ivl$(suffix)/include/constants.vams: $(srcdir)/constants.vams
+	$(INSTALL_DATA) $(srcdir)/constants.vams $(DESTDIR)$(libdir)/ivl$(suffix)/include/constants.vams
 
-$(libdir)/ivl/include/disciplines.vams: $(srcdir)/disciplines.vams
-	$(INSTALL_DATA) $(srcdir)/disciplines.vams $(DESTDIR)$(libdir)/ivl/include/disciplines.vams
+$(libdir)/ivl$(suffix)/include/disciplines.vams: $(srcdir)/disciplines.vams
+	$(INSTALL_DATA) $(srcdir)/disciplines.vams $(DESTDIR)$(libdir)/ivl$(suffix)/include/disciplines.vams
 
 $(includedir)/ivl_target.h: $(srcdir)/ivl_target.h
 	$(INSTALL_DATA) $(srcdir)/ivl_target.h $(DESTDIR)$(includedir)/ivl_target.h
@@ -282,49 +291,31 @@ $(includedir)/acc_user.h: $(srcdir)/acc_user.h
 $(includedir)/veriuser.h: $(srcdir)/veriuser.h
 	$(INSTALL_DATA) $(srcdir)/veriuser.h $(DESTDIR)$(includedir)/veriuser.h
 
-$(mandir)/man1/iverilog-vpi.1: $(srcdir)/iverilog-vpi.man
-	$(INSTALL_DATA) $(srcdir)/iverilog-vpi.man $(DESTDIR)$(mandir)/man1/iverilog-vpi.1
+$(mandir)/man1/iverilog-vpi$(suffix).1: $(srcdir)/iverilog-vpi.man
+	$(INSTALL_DATA) $(srcdir)/iverilog-vpi.man $(DESTDIR)$(mandir)/man1/iverilog-vpi$(suffix).1
 
-$(prefix)/iverilog-vpi.pdf: iverilog-vpi.pdf
-	$(INSTALL_DATA) iverilog-vpi.pdf $(DESTDIR)$(prefix)/iverilog-vpi.pdf
+$(prefix)/iverilog-vpi$(suffix).pdf: iverilog-vpi.pdf
+	$(INSTALL_DATA) iverilog-vpi.pdf $(DESTDIR)$(prefix)/iverilog-vpi$(suffix).pdf
 
-# In windows installations, put a few examples and the quick_start
-# into the destination directory.
-ifeq (@MINGW32@,yes)
-$(prefix)/hello.vl: $(srcdir)/examples/hello.vl
-	./dosify.exe $(srcdir)/examples/hello.vl tmp.vl
-	mv tmp.vl $(prefix)/hello.vl
-
-$(prefix)/sqrt.vl: $(srcdir)/examples/sqrt.vl
-	./dosify.exe $(srcdir)/examples/sqrt.vl tmp.vl
-	mv tmp.vl $(prefix)/sqrt.vl
-
-$(prefix)/sqrt-virtex.v: $(srcdir)/examples/sqrt-virtex.v
-	./dosify.exe $(srcdir)/examples/sqrt-virtex.v tmp.vl
-	mv tmp.vl $(prefix)/sqrt-virtex.v
-
-$(prefix)/QUICK_START.txt: $(srcdir)/QUICK_START.txt
-	./dosify.exe $(srcdir)/QUICK_START.txt tmp.txt
-	mv tmp.txt $(prefix)/QUICK_START.txt
-endif
 
 installdirs: mkinstalldirs
-	$(srcdir)/mkinstalldirs $(DESTDIR)$(bindir) $(DESTDIR)$(includedir) $(DESTDIR)$(libdir)/ivl \
-	    $(DESTDIR)$(libdir)/ivl/include $(DESTDIR)$(mandir) $(DESTDIR)$(mandir)/man1
+	$(srcdir)/mkinstalldirs $(DESTDIR)$(bindir) $(DESTDIR)$(includedir) $(DESTDIR)$(libdir)/ivl$(suffix) \
+	    $(DESTDIR)$(libdir)/ivl$(suffix)/include $(DESTDIR)$(mandir) $(DESTDIR)$(mandir)/man1
 
 uninstall:
 	for dir in $(SUBDIRS); do (cd $$dir ; $(MAKE) $@); done
 	for dir in vpi ivlpp driver; \
 	    do (cd $$dir ; $(MAKE) $@); done
 	for f in ivl@EXEEXT@ include/constants.vams include/disciplines.vams; \
-	    do rm -f $(DESTDIR)$(libdir)/ivl/$$f; done
-	-rmdir $(DESTDIR)$(libdir)/ivl/include
-	-rmdir $(DESTDIR)$(libdir)/ivl
-	for f in verilog iverilog-vpi gverilog@EXEEXT@; \
+	    do rm -f $(DESTDIR)$(libdir)/ivl$(suffix)/$$f; done
+	-rmdir $(DESTDIR)$(libdir)/ivl$(suffix)/include
+	-rmdir $(DESTDIR)$(libdir)/ivl$(suffix)
+	for f in verilog$(suffix) iverilog-vpi$(suffix) gverilog$(suffix)@EXEEXT@; \
 	    do rm -f $(DESTDIR)$(bindir)/$$f; done
 	for f in ivl_target.h vpi_user.h _pli_types.h acc_user.h veriuser.h; \
 	    do rm -f $(DESTDIR)$(includedir)/$$f; done
-	rm -f $(DESTDIR)$(mandir)/man1/iverilog-vpi.1 $(DESTDIR)$(prefix)/iverilog-vpi.pdf
+	-test X$(suffix) = X || rmdir $(DESTDIR)/$(includedir)
+	rm -f $(DESTDIR)$(mandir)/man1/iverilog-vpi$(suffix).1 $(DESTDIR)$(prefix)/iverilog-vpi$(suffix).pdf
 
 
 -include $(patsubst %.o, dep/%.d, $O)
diff --git a/README.txt b/README.txt
index b980e9c1f..3186c5038 100644
--- a/README.txt
+++ b/README.txt
@@ -85,10 +85,6 @@ Normally, this command automatically figures out everything it needs
 to know. It generally works pretty well. There are a few flags to the
 configure script that modify its behavior:
 
-	--without-ipal
-	    This turns off support for Icarus PAL, whether ipal
-	    libraries are installed or not.
-
 	--prefix=<root>
 	    The default is /usr/local, which causes the tool suite to
 	    be compiled for install in /usr/local/bin,
@@ -99,27 +95,16 @@ configure script that modify its behavior:
 	    common to use --prefix=/opt.  You can configure for a non-root
 	    install with --prefix=$HOME.
 
-	--enable-vvp32 (experimental)
-	    If compiling on AMD64 systems, this enables the
-	    compilation of 32bit compatible vvp (vvp32) and the vpi
-	    modules that match.
-
-2.2.1 Special AMD64 Instructions
-
-(The Icarus Verilog RPM for x86_64 is build using these instructions.)
-
-If you are building for Linux/AMD64 (a.k.a x86_64) then to get the
-most out of your install, first make sure you have both 64bit and
-32bit development libraries installed. Then configure with this
-somewhat more complicated command:
-
-  ./configure libdir64='$(prefix)/lib64' vpidir1=vpi64 vpidir2=. --enable-vvp32
-
-This reflects the convention on AMD64 systems that 64bit libraries go
-into lib64 directories. The "--enable-vvp32" also turns on 32bit
-compatibility files. A 32bit version of vvp (vvp32) will be created,
-as well as 32bit versions of the development libraries and bundled VPI
-libraries.
+	--enable-suffix
+	--enable-suffix=<your-suffix>
+	--disable-suffix
+	    Enable/disable changing the names of install files to use
+	    a suffix string so that this version or install can co-
+	    exist with other versions. This renames the installed
+	    commands (iverilog, iverilog-vpi, vvp) and the installed
+	    library files and include directory so that installations
+	    with the same prefix but different suffix are guaranteed
+	    to not interfere with each other.
 
 2.3 (Optional) Testing
 
diff --git a/aclocal.m4 b/aclocal.m4
index 76ddc0296..0c140fc0a 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -24,6 +24,23 @@ fi
 AC_SUBST(ident_support)
 ])# AC_CPP_IDENT
 
+# AX_ENABLE_SUFFIX
+# ----------------
+#  Create the configure option --enable-suffix[=suffix] to generate suffix
+# strings for the installed commands. This allows for shared installs of
+# different builds. Remember to change the default suffix string to some
+# value appropriate for the current version.
+AC_DEFUN([AX_ENABLE_SUFFIX],
+[AC_ARG_ENABLE([suffix],[Set the installation command suffix],[true],[enable_suffix=no])
+if test X$enable_suffix = Xyes; then
+  install_suffix='-0.9'
+elif test X$enable_suffix = Xno; then
+  install_suffix=''
+else
+  install_suffix="$enable_suffix"
+fi
+AC_SUBST(install_suffix)
+])# AX_ENABLE_SUFFIX
 
 # _AX_C_UNDERSCORES_MATCH_IFELSE(PATTERN, ACTION-IF-MATCH, ACTION-IF-NOMATCH)
 # ------------------------------
diff --git a/cadpli/Makefile.in b/cadpli/Makefile.in
index 2d4f81c0f..669961ff6 100644
--- a/cadpli/Makefile.in
+++ b/cadpli/Makefile.in
@@ -20,6 +20,8 @@ SHELL = /bin/sh
 
 VERSION = 0.9.devel
 
+suffix = @install_suffix@
+
 prefix = @prefix@
 exec_prefix = @exec_prefix@
 srcdir = @srcdir@
@@ -30,7 +32,7 @@ bindir = @bindir@
 libdir = @libdir@
 includedir = $(prefix)/include
 
-vpidir = @libdir@/ivl
+vpidir = @libdir@/ivl$(suffix)
 
 CC = @CC@
 INSTALL = @INSTALL@
diff --git a/cadpli/configure.in b/cadpli/configure.in
index 99f1a1e45..fa55d815a 100644
--- a/cadpli/configure.in
+++ b/cadpli/configure.in
@@ -10,6 +10,8 @@ AC_SUBST(EXEEXT)
 # Combined check for Microsoft-related bogosities; sets WIN32 if found
 AX_WIN32
 
+AX_ENABLE_SUFFIX
+
 AC_PROG_INSTALL
 
 AC_CHECK_HEADERS(malloc.h)
diff --git a/configure.in b/configure.in
index 5443f69ec..ab66fb7a8 100644
--- a/configure.in
+++ b/configure.in
@@ -92,6 +92,8 @@ AC_C_BIGENDIAN
 
 # $host
 
+AX_ENABLE_SUFFIX
+
 AX_LD_EXTRALIBS
 
 # Compiler option for position independent code, needed when making shared objects.
diff --git a/driver-vpi/Makefile.in b/driver-vpi/Makefile.in
index a33053ae1..73843a9bd 100644
--- a/driver-vpi/Makefile.in
+++ b/driver-vpi/Makefile.in
@@ -20,6 +20,8 @@ SHELL = /bin/sh
 
 VERSION = 0.9.devel
 
+suffix = @install_suffix@
+
 prefix = @prefix@
 exec_prefix = @exec_prefix@
 srcdir = @srcdir@
@@ -27,6 +29,8 @@ datarootdir = @datarootdir@
 
 VPATH = $(srcdir)
 
+suffix = @install_suffix@
+
 bindir = $(exec_prefix)/bin
 libdir = $(exec_prefix)/lib
 includedir = $(prefix)/include
@@ -65,6 +69,7 @@ main.o: main.c config.h
 
 config.h: config.h.in
 	sed -e 's;@IVLCC@;@CC@;' -e 's;@IVLCXX@;@CXX@;' \
+	    -e 's;@SUFFIX@;$(suffix);' \
 	    -e 's;@IVLCFLAGS@;@CXXFLAGS@;' \
 	    -e 's;@SHARED@;@shared@;' $< > $@
 
@@ -73,13 +78,13 @@ res.o: res.rc
 	windres -i res.rc -o res.o
 #
 
-install: all installdirs $(bindir)/iverilog-vpi@EXEEXT@
+install: all installdirs $(bindir)/iverilog-vpi$(suffix)@EXEEXT@
 
-$(bindir)/iverilog-vpi@EXEEXT@: ./iverilog-vpi@EXEEXT@
-	$(INSTALL_PROGRAM) ./iverilog-vpi@EXEEXT@ $(bindir)/iverilog-vpi@EXEEXT@
+$(bindir)/iverilog-vpi$(suffix)@EXEEXT@: ./iverilog-vpi@EXEEXT@
+	$(INSTALL_PROGRAM) ./iverilog-vpi@EXEEXT@ $(bindir)/iverilog-vpi$(suffix)@EXEEXT@
 
 installdirs: ../mkinstalldirs
 	$(srcdir)/../mkinstalldirs $(bindir)
 
 uninstall:
-	rm -f $(bindir)/iverilog-vpi@EXEEXT@
+	rm -f $(bindir)/iverilog-vpi$(suffix)@EXEEXT@
diff --git a/driver-vpi/config.h.in b/driver-vpi/config.h.in
index ca1005555..9f4da0c15 100644
--- a/driver-vpi/config.h.in
+++ b/driver-vpi/config.h.in
@@ -5,4 +5,5 @@
 #define IVERILOG_VPI_CXX       "@IVLCXX@"
 #define IVERILOG_VPI_CFLAGS    " @IVLCFLAGS@"
 #define IVERILOG_VPI_LDFLAGS   "@SHARED@"
-#define IVERILOG_VPI_LDLIBS    "-lveriuser -lvpi"
+#define IVERILOG_VPI_LDLIBS    "-lveriuser@SUFFIX@ -lvpi@SUFFIX@"
+#define IVERILOG_SUFFIX        "@SUFFIX@"
\ No newline at end of file
diff --git a/driver-vpi/main.c b/driver-vpi/main.c
index a5be8f8dc..a08260dfb 100644
--- a/driver-vpi/main.c
+++ b/driver-vpi/main.c
@@ -87,9 +87,9 @@ static void myExit(int exitVal)
 
 static void usage()
 {
-	fprintf(stderr,"usage: iverilog-vpi [src and obj files]...\n");
-	fprintf(stderr,"   or  iverilog-vpi -mingw=dir\n");
-	fprintf(stderr,"   or  iverilog-vpi -ivl=dir\n");
+	fprintf(stderr,"usage: iverilog-vpi" IVERILOG_SUFFIX " [src and obj files]...\n");
+	fprintf(stderr,"   or  iverilog-vpi" IVERILOG_SUFFIX " -mingw=dir\n");
+	fprintf(stderr,"   or  iverilog-vpi" IVERILOG_SUFFIX " -ivl=dir\n");
 	myExit(1);
 }
 
@@ -384,7 +384,7 @@ static int parse(int argc, char *argv[])
 		  /* Check for the --install-dir option */
 		else if (stricmp("--install-dir", argv[idx]) == 0) {
 			setup_ivl_environment();
-			printf("%s\\\\lib\\\\ivl\\\\.\n", gstr.pIVL);
+			printf("%s\\\\lib\\\\ivl" IVERILOG_SUFFIX "\\\\.\n", gstr.pIVL);
 			myExit(0);
 		}
 		  /* This is different than iverilog-vpi.sh, we don't
@@ -444,14 +444,14 @@ static void checkIvlDir(char *root)
 	initDynString(&path);
 	assign(&path,gstr.pIVL);
 	appendBackSlash(&path);
-	append(&path,"bin\\vvp.exe");
+	append(&path,"bin\\vvp" IVERILOG_SUFFIX ".exe");
 
 	irv = _stat(path,&stat_buf);
 	deInitDynString(path);
 
 	if (irv) {
 		fprintf(stderr,"error: %s does not appear to be the valid root directory of\n",root);
-		fprintf(stderr,"       Icarus Verilog.  Use the -ivl option of iverilog-vpi.exe to\n");
+		fprintf(stderr,"       Icarus Verilog.  Use the -ivl option of iverilog-vpi" IVERILOG_SUFFIX " to\n");
 		fprintf(stderr,"       point to the Icarus Verilog root directory.  For a Windows\n");
 		fprintf(stderr,"       command shell the option would be something like -ivl=c:\\iverilog\n");
 		fprintf(stderr,"       For a Cygwin shell the option would be something like\n");
@@ -503,7 +503,7 @@ static void setup_ivl_environment()
 		SetRegistryKey(IVL_REGKEY_IVL,gstr.pIVL);
 	} else if (!GetRegistryKey(IVL_REGKEY_IVL,&gstr.pIVL)) {
 			fprintf(stderr,"error: can not locate the Icarus Verilog root directory, use the -ivl option\n");
-			fprintf(stderr,"       of iverilog-vpi.exe to point to the Icarus Verilog root directory.\n");
+			fprintf(stderr,"       of iverilog-vpi" IVERILOG_SUFFIX " to point to the Icarus Verilog root directory.\n");
 			fprintf(stderr,"       For a Windows command shell the option would be something like\n");
 			fprintf(stderr,"       -ivl=c:\\iverilog  For a Cygwin shell the option would be something\n");
 			fprintf(stderr,"       like -ivl=c:\\\\iverilog\n");
@@ -516,7 +516,7 @@ static void setup_ivl_environment()
 	append(&gstr.pCFLAGS,gstr.pIVL);
 	appendBackSlash(&gstr.pCFLAGS);
 	append(&gstr.pCFLAGS, "\\");
-	append(&gstr.pCFLAGS,"include");
+	append(&gstr.pCFLAGS,"include" IVERILOG_SUFFIX);
 
 	  /* Build up the LDFLAGS option string */
 	assign(&gstr.pLDLIBS,"-L");
diff --git a/driver/Makefile.in b/driver/Makefile.in
index e3b91d3e4..f624bd427 100644
--- a/driver/Makefile.in
+++ b/driver/Makefile.in
@@ -20,6 +20,8 @@ SHELL = /bin/sh
 
 VERSION = 0.9.devel
 
+suffix = @install_suffix@
+
 prefix = @prefix@
 exec_prefix = @exec_prefix@
 srcdir = @srcdir@
@@ -68,7 +70,7 @@ cfparse.h cfparse.c: cfparse.y
 
 
 main.o: main.c globals.h ../version.h
-	$(CC) $(CPPFLAGS) $(CFLAGS) -c -DIVL_ROOT='"@libdir@/ivl"'  -DIVL_INC='"@includedir@"' -DIVL_LIB='"@libdir@"' -DDLLIB='"@DLLIB@"' $(srcdir)/main.c
+	$(CC) $(CPPFLAGS) $(CFLAGS) -c -DIVL_ROOT='"@libdir@/ivl$(suffix)"'  -DIVL_INC='"@includedir@"' -DIVL_LIB='"@libdir@"' -DDLLIB='"@DLLIB@"' $(srcdir)/main.c
 
 build_string.o: build_string.c globals.h
 cflexor.o: cflexor.c cfparse.h cfparse_misc.h globals.h
@@ -82,35 +84,35 @@ iverilog.pdf: iverilog.ps
 
 ifeq (@MINGW32@,yes)
 ifeq ($(MAN),none)
-INSTALL_DOC = $(mandir)/man1/iverilog.1
+INSTALL_DOC = $(mandir)/man1/iverilog$(suffix).1
 else
 ifeq ($(PS2PDF),none)
-INSTALL_DOC = $(mandir)/man1/iverilog.1
+INSTALL_DOC = $(mandir)/man1/iverilog$(suffix).1
 else
-INSTALL_DOC = $(prefix)/iverilog.pdf $(mandir)/man1/iverilog.1
+INSTALL_DOC = $(prefix)/iverilog$(suffix).pdf $(mandir)/man1/iverilog$(suffix).1
 all: iverilog.pdf
 endif
 endif
 INSTALL_DOCDIR = $(mandir)/man1
 else
-INSTALL_DOC = $(mandir)/man1/iverilog.1
+INSTALL_DOC = $(mandir)/man1/iverilog$(suffix).1
 INSTALL_DOCDIR = $(mandir)/man1
 endif
 
-install: all installdirs $(bindir)/iverilog@EXEEXT@ $(INSTALL_DOC)
+install: all installdirs $(bindir)/iverilog$(suffix)@EXEEXT@ $(INSTALL_DOC)
 
-$(bindir)/iverilog@EXEEXT@: ./iverilog@EXEEXT@
-	$(INSTALL_PROGRAM) ./iverilog@EXEEXT@ $(DESTDIR)$(bindir)/iverilog@EXEEXT@
+$(bindir)/iverilog$(suffix)@EXEEXT@: ./iverilog@EXEEXT@
+	$(INSTALL_PROGRAM) ./iverilog@EXEEXT@ $(DESTDIR)$(bindir)/iverilog$(suffix)@EXEEXT@
 
-$(mandir)/man1/iverilog.1: $(srcdir)/iverilog.man
-	$(INSTALL_DATA) $(srcdir)/iverilog.man $(DESTDIR)$(mandir)/man1/iverilog.1
+$(mandir)/man1/iverilog$(suffix).1: $(srcdir)/iverilog.man
+	$(INSTALL_DATA) $(srcdir)/iverilog.man $(DESTDIR)$(mandir)/man1/iverilog$(suffix).1
 
-$(prefix)/iverilog.pdf: iverilog.pdf
-	$(INSTALL_DATA) iverilog.pdf $(prefix)/iverilog.pdf
+$(prefix)/iverilog$(suffix).pdf: iverilog.pdf
+	$(INSTALL_DATA) iverilog.pdf $(prefix)/iverilog$(suffix).pdf
 
 installdirs: ../mkinstalldirs
 	$(srcdir)/../mkinstalldirs $(DESTDIR)$(bindir) $(DESTDIR)$(INSTALL_DOCDIR)
 
 uninstall:
-	rm -f $(DESTDIR)$(bindir)/iverilog@EXEEXT@
-	rm -f $(DESTDIR)$(mandir)/man1/iverilog.1 $(DESTDIR)$(prefix)/iverilog.pdf
+	rm -f $(DESTDIR)$(bindir)/iverilog$(suffix)@EXEEXT@
+	rm -f $(DESTDIR)$(mandir)/man1/iverilog$(suffix).1 $(DESTDIR)$(prefix)/iverilog$(suffix).pdf
diff --git a/iverilog-vpi.sh b/iverilog-vpi.sh
index b49abe6cc..29c9a880c 100644
--- a/iverilog-vpi.sh
+++ b/iverilog-vpi.sh
@@ -17,17 +17,18 @@
 #    59 Temple Place - Suite 330
 #    Boston, MA 02111-1307, USA
 #
-#ident "$Id: iverilog-vpi.sh,v 1.17 2007/02/06 05:07:31 steve Exp $"
 
 # These are the variables used for compiling files
 CC=@IVCC@
 CXX=@IVCXX@
 CFLAGS="@PIC@ @IVCFLAGS@ -I@INCLUDEDIR@"
 
+SUFFIX=@SUFFIX@
+
 # These are used for linking...
 LD=$CC
 LDFLAGS="@SHARED@ -L@LIBDIR@"
-LDLIBS="-lveriuser -lvpi"
+LDLIBS="-lveriuser$SUFFIX -lvpi$SUFFIX"
 
 CCSRC=
 CXSRC=
@@ -101,7 +102,7 @@ do
 	 ;;
 
     --install-dir)
-	 echo "@LIBDIR@/ivl"
+	 echo "@LIBDIR@/ivl$SUFFIX"
 	 exit
 	 ;;
     esac
diff --git a/ivlpp/Makefile.in b/ivlpp/Makefile.in
index 2a3e0d22f..c4e0b1ccf 100644
--- a/ivlpp/Makefile.in
+++ b/ivlpp/Makefile.in
@@ -25,6 +25,8 @@ SHELL = /bin/sh
 
 VERSION = 0.0
 
+suffix = @install_suffix@
+
 prefix = @prefix@
 exec_prefix = @exec_prefix@
 srcdir = @srcdir@
@@ -60,16 +62,16 @@ ivlpp@EXEEXT@: $O
 lexor.c: lexor.lex
 	flex -olexor.c $(srcdir)/lexor.lex
 
-install: all installdirs $(libdir)/ivl/ivlpp@EXEEXT@
+install: all installdirs $(libdir)/ivl$(suffix)/ivlpp@EXEEXT@
 
-$(libdir)/ivl/ivlpp@EXEEXT@: ivlpp@EXEEXT@
-	$(INSTALL_PROGRAM) ./ivlpp@EXEEXT@ $(DESTDIR)$(libdir)/ivl/ivlpp@EXEEXT@
+$(libdir)/ivl$(suffix)/ivlpp@EXEEXT@: ivlpp@EXEEXT@
+	$(INSTALL_PROGRAM) ./ivlpp@EXEEXT@ $(DESTDIR)$(libdir)/ivl$(suffix)/ivlpp@EXEEXT@
 
 installdirs: ../mkinstalldirs
-	$(srcdir)/../mkinstalldirs $(DESTDIR)$(libdir)/ivl
+	$(srcdir)/../mkinstalldirs $(DESTDIR)$(libdir)/ivl$(suffix)
 
 uninstall:
-	rm -f $(DESTDIR)$(libdir)/ivl/ivlpp@EXEEXT@
+	rm -f $(DESTDIR)$(libdir)/ivl$(suffix)/ivlpp@EXEEXT@
 
 lexor.o: lexor.c globals.h
 main.o: main.c globals.h
diff --git a/libveriuser/Makefile.in b/libveriuser/Makefile.in
index 7fc807e84..5c69e5485 100644
--- a/libveriuser/Makefile.in
+++ b/libveriuser/Makefile.in
@@ -21,6 +21,7 @@
 #
 SHELL = /bin/sh
 
+suffix = @install_suffix@
 
 prefix = @prefix@
 exec_prefix = @exec_prefix@
@@ -86,15 +87,15 @@ clean:
 distclean: clean
 	rm -f Makefile config.status config.log config.cache config.h
 
-install:: all installdirs $(libdir)/libveriuser.a $(INSTALL32)
+install:: all installdirs $(libdir)/libveriuser$(suffix).a $(INSTALL32)
 
-$(libdir)/libveriuser.a: ./libveriuser.a
-	$(INSTALL_DATA) ./libveriuser.a $(DESTDIR)$(libdir)/libveriuser.a
+$(libdir)/libveriuser$(suffix).a: ./libveriuser.a
+	$(INSTALL_DATA) ./libveriuser.a $(DESTDIR)$(libdir)/libveriuser$(suffix).a
 
 installdirs: mkinstalldirs
 	$(srcdir)/mkinstalldirs $(DESTDIR)$(includedir) $(DESTDIR)$(libdir)
 
 uninstall::
-	rm -f $(DESTDIR)$(libdir)/libveriuser.a
+	rm -f $(DESTDIR)$(libdir)/libveriuser$(suffix).a
 
 -include $(patsubst %.o, dep/%.d, $O)
diff --git a/libveriuser/configure.in b/libveriuser/configure.in
index e185749be..d3a37b8d9 100644
--- a/libveriuser/configure.in
+++ b/libveriuser/configure.in
@@ -10,6 +10,8 @@ AC_PROG_RANLIB
 AC_EXEEXT
 AX_CPP_IDENT
 
+AX_ENABLE_SUFFIX
+
 AC_CHECK_HEADERS(malloc.h)
 
 AC_CHECK_SIZEOF(unsigned long long)
diff --git a/tgt-fpga/Makefile.in b/tgt-fpga/Makefile.in
index a540f346c..0413f258b 100644
--- a/tgt-fpga/Makefile.in
+++ b/tgt-fpga/Makefile.in
@@ -24,6 +24,8 @@ SHELL = /bin/sh
 
 VERSION = 0.0
 
+suffix = @install_suffix@
+
 prefix = @prefix@
 exec_prefix = @exec_prefix@
 srcdir = @srcdir@
@@ -87,39 +89,39 @@ distclean: clean
 check: all
 
 ifeq (@WIN32@,yes)
-INSTALL_DOC = $(prefix)/iverilog-fpga.pdf $(mandir)/man1/iverilog-fpga.1
+INSTALL_DOC = $(prefix)/iverilog-fpga$(suffix).pdf $(mandir)/man1/iverilog-fpga$(suffix).1
 INSTALL_DOCDIR = $(mandir)/man1
 all: iverilog-fpga.pdf
 else
-INSTALL_DOC = $(mandir)/man1/iverilog-fpga.1
+INSTALL_DOC = $(mandir)/man1/iverilog-fpga$(suffix).1
 INSTALL_DOCDIR = $(mandir)/man1
 endif
 
-install: all installdirs $(libdir)/ivl/fpga.tgt $(INSTALL_DOC) $(libdir)/ivl/fpga.conf $(libdir)/ivl/fpga-s.conf
+install: all installdirs $(libdir)/ivl$(suffix)/fpga.tgt $(INSTALL_DOC) $(libdir)/ivl$(suffix)/fpga.conf $(libdir)/ivl$(suffix)/fpga-s.conf
 
-$(libdir)/ivl/fpga.tgt: ./fpga.tgt
-	$(INSTALL_PROGRAM) ./fpga.tgt $(libdir)/ivl/fpga.tgt
+$(libdir)/ivl$(suffix)/fpga.tgt: ./fpga.tgt
+	$(INSTALL_PROGRAM) ./fpga.tgt $(libdir)/ivl$(suffix)/fpga.tgt
 
-$(libdir)/ivl/fpga.conf: $(srcdir)/fpga.conf
-	$(INSTALL_DATA) $(srcdir)/fpga.conf $(libdir)/ivl/fpga.conf
+$(libdir)/ivl$(suffix)/fpga.conf: $(srcdir)/fpga.conf
+	$(INSTALL_DATA) $(srcdir)/fpga.conf $(libdir)/ivl$(suffix)/fpga.conf
 
-$(libdir)/ivl/fpga-s.conf: $(srcdir)/fpga-s.conf
-	$(INSTALL_DATA) $(srcdir)/fpga-s.conf $(libdir)/ivl/fpga-s.conf
+$(libdir)/ivl$(suffix)/fpga-s.conf: $(srcdir)/fpga-s.conf
+	$(INSTALL_DATA) $(srcdir)/fpga-s.conf $(libdir)/ivl$(suffix)/fpga-s.conf
 
 
-$(mandir)/man1/iverilog-fpga.1: $(srcdir)/iverilog-fpga.man
-	$(INSTALL_DATA) $(srcdir)/iverilog-fpga.man $(mandir)/man1/iverilog-fpga.1
+$(mandir)/man1/iverilog-fpga$(suffix).1: $(srcdir)/iverilog-fpga.man
+	$(INSTALL_DATA) $(srcdir)/iverilog-fpga.man $(mandir)/man1/iverilog-fpga$(suffix).1
 
-$(prefix)/iverilog-fpga.pdf: iverilog-fpga.pdf
-	$(INSTALL_DATA) iverilog-fpga.pdf $(prefix)/iverilog-fpga.pdf
+$(prefix)/iverilog-fpga$(suffix).pdf: iverilog-fpga.pdf
+	$(INSTALL_DATA) iverilog-fpga.pdf $(prefix)/iverilog-fpga$(suffix).pdf
 
 installdirs: ../mkinstalldirs
-	$(srcdir)/../mkinstalldirs $(libdir)/ivl
+	$(srcdir)/../mkinstalldirs $(libdir)/ivl$(suffix)
 
 uninstall:
-	rm -f $(libdir)/ivl/fpga.tgt
+	rm -f $(libdir)/ivl$(suffix)/fpga.tgt
 	rm -f $(INSTALL_DOC)
-	rm -f $(libdir)/ivl/fpga-s.conf
-	rm -f $(libdir)/ivl/fpga.conf
+	rm -f $(libdir)/ivl$(suffix)/fpga-s.conf
+	rm -f $(libdir)/ivl$(suffix)/fpga.conf
 
 -include $(patsubst %.o, dep/%.d, $O)
diff --git a/tgt-fpga/configure.in b/tgt-fpga/configure.in
index 725d36bdd..5481e1d8f 100644
--- a/tgt-fpga/configure.in
+++ b/tgt-fpga/configure.in
@@ -9,6 +9,8 @@ AC_PROG_INSTALL
 AC_CANONICAL_HOST
 # $host
 
+AX_ENABLE_SUFFIX
+
 # Combined check for Microsoft-related bogosities; sets WIN32 if found
 AX_WIN32
 
diff --git a/tgt-null/Makefile.in b/tgt-null/Makefile.in
index 845b2f0e1..5cb577068 100644
--- a/tgt-null/Makefile.in
+++ b/tgt-null/Makefile.in
@@ -20,6 +20,8 @@ SHELL = /bin/sh
 
 VERSION = 0.9.devel
 
+suffix = @install_suffix@
+
 prefix = @prefix@
 exec_prefix = @exec_prefix@
 srcdir = @srcdir@
@@ -28,7 +30,6 @@ VPATH = $(srcdir)
 
 bindir = @bindir@
 libdir = @libdir@
-includedir = $(prefix)/include
 
 CC = @CC@
 INSTALL = @INSTALL@
@@ -72,25 +73,25 @@ distclean: clean
 
 check: all
 
-install: all installdirs $(libdir)/ivl/null.tgt $(INSTALL_DOC) $(libdir)/ivl/null.conf $(libdir)/ivl/null-s.conf
+install: all installdirs $(libdir)/ivl$(suffix)/null.tgt $(INSTALL_DOC) $(libdir)/ivl$(suffix)/null.conf $(libdir)/ivl$(suffix)/null-s.conf
 
-$(libdir)/ivl/null.tgt: ./null.tgt
-	$(INSTALL_PROGRAM) ./null.tgt $(DESTDIR)$(libdir)/ivl/null.tgt
+$(libdir)/ivl$(suffix)/null.tgt: ./null.tgt
+	$(INSTALL_PROGRAM) ./null.tgt $(DESTDIR)$(libdir)/ivl$(suffix)/null.tgt
 
-$(libdir)/ivl/null.conf: $(srcdir)/null.conf
-	$(INSTALL_DATA) $(srcdir)/null.conf $(DESTDIR)$(libdir)/ivl/null.conf
+$(libdir)/ivl$(suffix)/null.conf: $(srcdir)/null.conf
+	$(INSTALL_DATA) $(srcdir)/null.conf $(DESTDIR)$(libdir)/ivl$(suffix)/null.conf
 
-$(libdir)/ivl/null-s.conf: $(srcdir)/null-s.conf
-	$(INSTALL_DATA) $(srcdir)/null-s.conf $(DESTDIR)$(libdir)/ivl/null-s.conf
+$(libdir)/ivl$(suffix)/null-s.conf: $(srcdir)/null-s.conf
+	$(INSTALL_DATA) $(srcdir)/null-s.conf $(DESTDIR)$(libdir)/ivl$(suffix)/null-s.conf
 
 
 installdirs: ../mkinstalldirs
-	$(srcdir)/../mkinstalldirs $(DESTDIR)$(includedir) $(DESTDIR)$(bindir) $(DESTDIR)$(libdir)/ivl
+	$(srcdir)/../mkinstalldirs $(DESTDIR)$(bindir) $(DESTDIR)$(libdir)/ivl$(suffix)
 
 uninstall:
-	rm -f $(DESTDIR)$(libdir)/ivl/null.tgt
-	rm -f $(DESTDIR)$(libdir)/ivl/null.conf
-	rm -f $(DESTDIR)$(libdir)/ivl/null-s.conf
+	rm -f $(DESTDIR)$(libdir)/ivl$(suffix)/null.tgt
+	rm -f $(DESTDIR)$(libdir)/ivl$(suffix)/null.conf
+	rm -f $(DESTDIR)$(libdir)/ivl$(suffix)/null-s.conf
 
 
 -include $(patsubst %.o, dep/%.d, $O)
diff --git a/tgt-stub/Makefile.in b/tgt-stub/Makefile.in
index fbf4702b3..b77bd6ec9 100644
--- a/tgt-stub/Makefile.in
+++ b/tgt-stub/Makefile.in
@@ -20,6 +20,8 @@ SHELL = /bin/sh
 
 VERSION = 0.9.devel
 
+suffix = @install_suffix@
+
 prefix = @prefix@
 exec_prefix = @exec_prefix@
 srcdir = @srcdir@
@@ -72,25 +74,25 @@ distclean: clean
 
 check: all
 
-install: all installdirs $(libdir)/ivl/stub.tgt \
-	$(libdir)/ivl/stub.conf $(libdir)/ivl/stub-s.conf
+install: all installdirs $(libdir)/ivl$(suffix)/stub.tgt \
+	$(libdir)/ivl$(suffix)/stub.conf $(libdir)/ivl$(suffix)/stub-s.conf
 
-$(libdir)/ivl/stub.tgt: ./stub.tgt
-	$(INSTALL_PROGRAM) ./stub.tgt $(DESTDIR)$(libdir)/ivl/stub.tgt
+$(libdir)/ivl$(suffix)/stub.tgt: ./stub.tgt
+	$(INSTALL_PROGRAM) ./stub.tgt $(DESTDIR)$(libdir)/ivl$(suffix)/stub.tgt
 
-$(libdir)/ivl/stub.conf: stub.conf
-	$(INSTALL_DATA) $< $(DESTDIR)$(libdir)/ivl/stub.conf
+$(libdir)/ivl$(suffix)/stub.conf: stub.conf
+	$(INSTALL_DATA) $< $(DESTDIR)$(libdir)/ivl$(suffix)/stub.conf
 
-$(libdir)/ivl/stub-s.conf: stub-s.conf
-	$(INSTALL_DATA) $< $(DESTDIR)$(libdir)/ivl/stub-s.conf
+$(libdir)/ivl$(suffix)/stub-s.conf: stub-s.conf
+	$(INSTALL_DATA) $< $(DESTDIR)$(libdir)/ivl$(suffix)/stub-s.conf
 
 installdirs: ../mkinstalldirs
-	$(srcdir)/../mkinstalldirs $(DESTDIR)$(includedir) $(DESTDIR)$(bindir) $(DESTDIR)$(libdir)/ivl
+	$(srcdir)/../mkinstalldirs $(DESTDIR)$(includedir) $(DESTDIR)$(bindir) $(DESTDIR)$(libdir)/ivl$(suffix)
 
 uninstall:
-	rm -f $(DESTDIR)$(libdir)/ivl/stub.tgt
-	rm -f $(DESTDIR)$(libdir)/ivl/stub.conf
-	rm -f $(DESTDIR)$(libdir)/ivl/stub-s.conf
+	rm -f $(DESTDIR)$(libdir)/ivl$(suffix)/stub.tgt
+	rm -f $(DESTDIR)$(libdir)/ivl$(suffix)/stub.conf
+	rm -f $(DESTDIR)$(libdir)/ivl$(suffix)/stub-s.conf
 
 
 -include $(patsubst %.o, dep/%.d, $O)
diff --git a/tgt-stub/configure.in b/tgt-stub/configure.in
index dab124974..5f3b050bb 100644
--- a/tgt-stub/configure.in
+++ b/tgt-stub/configure.in
@@ -9,6 +9,8 @@ AC_PROG_INSTALL
 AC_CANONICAL_HOST
 # $host
 
+AX_ENABLE_SUFFIX
+
 # Combined check for Microsoft-related bogosities; sets WIN32 if found
 AX_WIN32
 
diff --git a/tgt-vhdl/Makefile.in b/tgt-vhdl/Makefile.in
index 2348e5e97..c1bbe956d 100644
--- a/tgt-vhdl/Makefile.in
+++ b/tgt-vhdl/Makefile.in
@@ -20,6 +20,8 @@ SHELL = /bin/sh
 
 VERSION = 0.0
 
+suffix = @install_suffix@
+
 prefix = @prefix@
 prefix = @prefix@
 exec_prefix = @exec_prefix@
@@ -74,23 +76,23 @@ distclean: clean
 
 check: all
 
-install: all installdirs $(libdir)/ivl/vhdl.tgt $(libdir)/ivl/vhdl.conf \
-	$(libdir)/ivl/vhdl-s.conf
+install: all installdirs $(libdir)/ivl$(suffix)/vhdl.tgt $(libdir)/ivl$(suffix)/vhdl.conf \
+	$(libdir)/ivl$(suffix)/vhdl-s.conf
 
-$(libdir)/ivl/vhdl.tgt: ./vhdl.tgt
-	$(INSTALL_PROGRAM) ./vhdl.tgt $(DESTDIR)$(libdir)/ivl/vhdl.tgt
+$(libdir)/ivl$(suffix)/vhdl.tgt: ./vhdl.tgt
+	$(INSTALL_PROGRAM) ./vhdl.tgt $(DESTDIR)$(libdir)/ivl$(suffix)/vhdl.tgt
 
-$(libdir)/ivl/vhdl.conf: vhdl.conf
-	$(INSTALL_DATA) $< $(DESTDIR)$(libdir)/ivl/vhdl.conf
+$(libdir)/ivl$(suffix)/vhdl.conf: vhdl.conf
+	$(INSTALL_DATA) $< $(DESTDIR)$(libdir)/ivl$(suffix)/vhdl.conf
 
-$(libdir)/ivl/vhdl-s.conf: vhdl-s.conf
-	$(INSTALL_DATA) $< $(DESTDIR)$(libdir)/ivl/vhdl-s.conf
+$(libdir)/ivl$(suffix)/vhdl-s.conf: vhdl-s.conf
+	$(INSTALL_DATA) $< $(DESTDIR)$(libdir)/ivl$(suffix)/vhdl-s.conf
 
 installdirs: ../mkinstalldirs
-	$(srcdir)/../mkinstalldirs $(DESTDIR)$(libdir)/ivl
+	$(srcdir)/../mkinstalldirs $(DESTDIR)$(libdir)/ivl$(suffix)
 
 uninstall:
-	rm -f $(DESTDIR)$(libdir)/ivl/vhdl.tgt $(DESTDIR)$(libdir)/ivl/vhdl.conf
+	rm -f $(DESTDIR)$(libdir)/ivl$(suffix)/vhdl.tgt $(DESTDIR)$(libdir)/ivl$(suffix)/vhdl.conf $(DESTDIR)$(libdir)/ivl$(suffix)/vhdl-s.conf
 
 
 -include $(patsubst %.o, dep/%.d, $O)
diff --git a/tgt-vhdl/configure.in b/tgt-vhdl/configure.in
index 3223b50e8..52ca76897 100644
--- a/tgt-vhdl/configure.in
+++ b/tgt-vhdl/configure.in
@@ -11,6 +11,8 @@ AC_PROG_INSTALL
 AC_CANONICAL_HOST
 # $host
 
+AX_ENABLE_SUFFIX
+
 # Combined check for Microsoft-related bogosities; sets WIN32 if found
 AX_WIN32
 
diff --git a/tgt-vvp/Makefile.in b/tgt-vvp/Makefile.in
index b71c1310a..4c1076523 100644
--- a/tgt-vvp/Makefile.in
+++ b/tgt-vvp/Makefile.in
@@ -23,6 +23,8 @@ SHELL = /bin/sh
 
 VERSION = 0.0
 
+suffix = @install_suffix@
+
 prefix = @prefix@
 exec_prefix = @exec_prefix@
 srcdir = @srcdir@
@@ -69,10 +71,10 @@ vvp.tgt: $O $(TGTDEPLIBS)
 	$(CC) @shared@ -o $@ $O $(TGTLDFLAGS)
 
 vvp.conf: $(srcdir)/vvp.conf.in
-	echo 'flag:VVP_EXECUTABLE=$(bindir)/vvp' | cat $(srcdir)/vvp.conf.in - > vvp.conf
+	echo 'flag:VVP_EXECUTABLE=$(bindir)/vvp$(suffix)' | cat $(srcdir)/vvp.conf.in - > vvp.conf
 
 vvp-s.conf: $(srcdir)/vvp-s.conf.in
-	echo 'flag:VVP_EXECUTABLE=$(bindir)/vvp' | cat $(srcdir)/vvp-s.conf.in - > vvp-s.conf
+	echo 'flag:VVP_EXECUTABLE=$(bindir)/vvp$(suffix)' | cat $(srcdir)/vvp-s.conf.in - > vvp-s.conf
 
 Makefile: Makefile.in config.status
 	./config.status
@@ -85,23 +87,23 @@ distclean: clean
 
 check: all
 
-install: all installdirs $(libdir)/ivl/vvp.tgt $(libdir)/ivl/vvp.conf $(libdir)/ivl/vvp-s.conf
+install: all installdirs $(libdir)/ivl$(suffix)/vvp.tgt $(libdir)/ivl$(suffix)/vvp.conf $(libdir)/ivl$(suffix)/vvp-s.conf
 
-$(libdir)/ivl/vvp.tgt: ./vvp.tgt
-	$(INSTALL_PROGRAM) ./vvp.tgt $(DESTDIR)$(libdir)/ivl/vvp.tgt
+$(libdir)/ivl$(suffix)/vvp.tgt: ./vvp.tgt
+	$(INSTALL_PROGRAM) ./vvp.tgt $(DESTDIR)$(libdir)/ivl$(suffix)/vvp.tgt
 
-$(libdir)/ivl/vvp.conf: vvp.conf
-	$(INSTALL_DATA) $< $(DESTDIR)$(libdir)/ivl/vvp.conf
+$(libdir)/ivl$(suffix)/vvp.conf: vvp.conf
+	$(INSTALL_DATA) $< $(DESTDIR)$(libdir)/ivl$(suffix)/vvp.conf
 
-$(libdir)/ivl/vvp-s.conf: vvp-s.conf
-	$(INSTALL_DATA) $< $(DESTDIR)$(libdir)/ivl/vvp-s.conf
+$(libdir)/ivl$(suffix)/vvp-s.conf: vvp-s.conf
+	$(INSTALL_DATA) $< $(DESTDIR)$(libdir)/ivl$(suffix)/vvp-s.conf
 
 
 installdirs: ../mkinstalldirs
-	$(srcdir)/../mkinstalldirs $(DESTDIR)$(libdir)/ivl
+	$(srcdir)/../mkinstalldirs $(DESTDIR)$(libdir)/ivl$(suffix)
 
 uninstall:
-	rm -f $(DESTDIR)$(libdir)/ivl/vvp.tgt $(DESTDIR)$(libdir)/ivl/vvp.conf $(DESTDIR)$(libdir)/ivl/vvp-s.conf
+	rm -f $(DESTDIR)$(libdir)/ivl$(suffix)/vvp.tgt $(DESTDIR)$(libdir)/ivl$(suffix)/vvp.conf $(DESTDIR)$(libdir)/ivl$(suffix)/vvp-s.conf
 
 
 -include $(patsubst %.o, dep/%.d, $O)
diff --git a/tgt-vvp/configure.in b/tgt-vvp/configure.in
index eef3ee18f..9a245752a 100644
--- a/tgt-vvp/configure.in
+++ b/tgt-vvp/configure.in
@@ -10,6 +10,8 @@ AC_PROG_INSTALL
 AC_CANONICAL_HOST
 # $host
 
+AX_ENABLE_SUFFIX
+
 # Combined check for Microsoft-related bogosities; sets WIN32 if found
 AX_WIN32
 
diff --git a/vpi/Makefile.in b/vpi/Makefile.in
index d6ee95e6e..77c5b492b 100644
--- a/vpi/Makefile.in
+++ b/vpi/Makefile.in
@@ -20,6 +20,8 @@ SHELL = /bin/sh
 
 VERSION = 0.9.devel
 
+suffix = @install_suffix@
+
 prefix = @prefix@
 exec_prefix = @exec_prefix@
 srcdir = @srcdir@
@@ -30,7 +32,7 @@ bindir = @bindir@
 libdir = @libdir@
 includedir = $(prefix)/include
 
-vpidir = $(libdir)/ivl
+vpidir = $(libdir)/ivl$(suffix)
 
 CC = @CC@
 INSTALL = @INSTALL@
@@ -114,26 +116,26 @@ distclean: clean
 check: all
 
 install: all installdirs \
-    $(vpidir)/system.vpi $(libdir)/ivl/system.sft \
-    $(vpidir)/va_math.vpi $(libdir)/ivl/va_math.sft \
-    $(vpidir)/v2005_math.vpi $(libdir)/ivl/v2005_math.sft
+    $(vpidir)/system.vpi $(vpidir)/system.sft \
+    $(vpidir)/va_math.vpi $(vpidir)/va_math.sft \
+    $(vpidir)/v2005_math.vpi $(vpidir)/v2005_math.sft
 
 $(vpidir)/system.vpi: ./system.vpi
 	$(INSTALL_PROGRAM) ./system.vpi $(DESTDIR)$(vpidir)/system.vpi
 
-$(libdir)/ivl/system.sft: system.sft
+$(vpidir)/system.sft: system.sft
 	$(INSTALL_DATA) $< $(DESTDIR)$@
 
 $(vpidir)/va_math.vpi: ./va_math.vpi
 	$(INSTALL_PROGRAM) ./va_math.vpi $(DESTDIR)$(vpidir)/va_math.vpi
 
-$(libdir)/ivl/va_math.sft: va_math.sft
+$(vpidir)/va_math.sft: va_math.sft
 	$(INSTALL_DATA) $< $(DESTDIR)$@
 
 $(vpidir)/v2005_math.vpi: ./v2005_math.vpi
 	$(INSTALL_PROGRAM) ./v2005_math.vpi $(DESTDIR)$(vpidir)/v2005_math.vpi
 
-$(libdir)/ivl/v2005_math.sft: v2005_math.sft
+$(vpidir)/v2005_math.sft: v2005_math.sft
 	$(INSTALL_DATA) $< $(DESTDIR)$@
 
 installdirs: ../mkinstalldirs
@@ -141,10 +143,10 @@ installdirs: ../mkinstalldirs
 
 uninstall:
 	rm -f $(DESTDIR)$(vpidir)/system.vpi
-	rm -f $(DESTDIR)$(libdir)/ivl/system.sft
+	rm -f $(DESTDIR)$(vpidir)/system.sft
 	rm -f $(DESTDIR)$(vpidir)/va_math.vpi
-	rm -f $(DESTDIR)$(libdir)/ivl/va_math.sft
+	rm -f $(DESTDIR)$(vpidir)/va_math.sft
 	rm -f $(DESTDIR)$(vpidir)/v2005_math.vpi
-	rm -f $(DESTDIR)$(libdir)/ivl/v2005_math.sft
+	rm -f $(DESTDIR)$(vpidir)/v2005_math.sft
 
 -include $(patsubst %.o, dep/%.d, $O)
diff --git a/vpi/configure.in b/vpi/configure.in
index 9e0125650..bf3d8f775 100644
--- a/vpi/configure.in
+++ b/vpi/configure.in
@@ -71,6 +71,8 @@ AC_SUBST(file64_support)
 
 # $host
 
+AX_ENABLE_SUFFIX
+
 # Compiler option for position independent code, needed when making shared objects.
 AX_C_PICFLAG
 
diff --git a/vvp/Makefile.in b/vvp/Makefile.in
index a65994e6b..17cf2face 100644
--- a/vvp/Makefile.in
+++ b/vvp/Makefile.in
@@ -21,6 +21,8 @@
 #
 SHELL = /bin/sh
 
+suffix = @install_suffix@
+
 prefix = @prefix@
 exec_prefix = @exec_prefix@
 srcdir = @srcdir@
@@ -53,9 +55,9 @@ LIBS = @LIBS@ @EXTRALIBS@
 
 dllib=@DLLIB@
 
-MDIR1 = -DMODULE_DIR1=\"$(libdir)/ivl/@vpidir1@\"
+MDIR1 = -DMODULE_DIR1=\"$(libdir)/ivl$(suffix)/@vpidir1@\"
 ifneq (x@vpidir2@,x)
-MDIR2 = -DMODULE_DIR2=\"$(libdir)/ivl/@vpidir2@\"
+MDIR2 = -DMODULE_DIR2=\"$(libdir)/ivl$(suffix)/@vpidir2@\"
 endif
 
 all: dep vvp@EXEEXT@ libvpi.a
@@ -139,18 +141,18 @@ vvp.pdf: $(srcdir)/vvp.man
 
 ifeq (@MINGW32@,yes)
 ifeq ($(MAN),none)
-INSTALL_DOC = $(mandir)/man1/vvp.1
+INSTALL_DOC = $(mandir)/man1/vvp$(suffix).1
 else
 ifeq ($(PS2PDF),none)
-INSTALL_DOC = $(mandir)/man1/vvp.1
+INSTALL_DOC = $(mandir)/man1/vvp$(suffix).1
 else
-INSTALL_DOC = $(prefix)/vvp.pdf $(mandir)/man1/vvp.1
+INSTALL_DOC = $(prefix)/vvp$(suffix).pdf $(mandir)/man1/vvp$(suffix).1
 all: vvp.pdf
 endif
 endif
 INSTALL_DOCDIR = $(mandir)/man1
 else
-INSTALL_DOC = $(mandir)/man1/vvp.1
+INSTALL_DOC = $(mandir)/man1/vvp$(suffix).1
 INSTALL_DOCDIR = $(mandir)/man1
 endif
 
@@ -158,27 +160,27 @@ Makefile: Makefile.in config.status
 	./config.status
 
 
-install: all installdirs $(bindir)/vvp@EXEEXT@ $(libdir)/libvpi.a $(INSTALL_DOC)
+install: all installdirs $(bindir)/vvp$(suffix)@EXEEXT@ $(libdir)/libvpi$(suffix).a $(INSTALL_DOC)
 
-$(bindir)/vvp@EXEEXT@: ./vvp@EXEEXT@
-	$(INSTALL_PROGRAM) ./vvp@EXEEXT@ $(DESTDIR)$(bindir)/vvp@EXEEXT@
+$(bindir)/vvp$(suffix)@EXEEXT@: ./vvp@EXEEXT@
+	$(INSTALL_PROGRAM) ./vvp@EXEEXT@ $(DESTDIR)$(bindir)/vvp$(suffix)@EXEEXT@
 
-$(libdir)/libvpi.a : ./libvpi.a
-	$(INSTALL_DATA) libvpi.a $(DESTDIR)$(libdir)/libvpi.a
+$(libdir)/libvpi$(suffix).a : ./libvpi.a
+	$(INSTALL_DATA) libvpi.a $(DESTDIR)$(libdir)/libvpi$(suffix).a
 
-$(mandir)/man1/vvp.1: $(srcdir)/vvp.man
-	$(INSTALL_DATA) $(srcdir)/vvp.man $(DESTDIR)$(mandir)/man1/vvp.1
+$(mandir)/man1/vvp$(suffix).1: $(srcdir)/vvp.man
+	$(INSTALL_DATA) $(srcdir)/vvp.man $(DESTDIR)$(mandir)/man1/vvp$(suffix).1
 
-$(prefix)/vvp.pdf: vvp.pdf
-	$(INSTALL_DATA) vvp.pdf $(DESTDIR)$(prefix)/vvp.pdf
+$(prefix)/vvp$(suffix).pdf: vvp.pdf
+	$(INSTALL_DATA) vvp.pdf $(DESTDIR)$(prefix)/vvp$(suffix).pdf
 
 installdirs: $(srcdir)/mkinstalldirs
 	$(srcdir)/mkinstalldirs $(DESTDIR)$(bindir) $(DESTDIR)$(libdir) $(DESTDIR)$(INSTALL_DOCDIR)
 
 
 uninstall: $(UNINSTALL32)
-	rm -f $(DESTDIR)$(bindir)/vvp@EXEEXT@
-	rm -f $(DESTDIR)$(libdir)/libvpi.a
-	rm -f $(DESTDIR)$(mandir)/man1/vvp.1 $(DESTDIR)$(prefix)/vvp.pdf
+	rm -f $(DESTDIR)$(bindir)/vvp$(suffix)@EXEEXT@
+	rm -f $(DESTDIR)$(libdir)/libvpi$(suffix).a
+	rm -f $(DESTDIR)$(mandir)/man1/vvp$(suffix).1 $(DESTDIR)$(prefix)/vvp$(suffix).pdf
 
 -include $(patsubst %.o, dep/%.d, $O)
diff --git a/vvp/configure.in b/vvp/configure.in
index 28e762708..3ffa8bc4c 100644
--- a/vvp/configure.in
+++ b/vvp/configure.in
@@ -3,6 +3,8 @@ AC_CONFIG_HEADER(config.h)
 
 AC_PROG_CC
 
+AX_ENABLE_SUFFIX
+
 #######################
 ## test for underscores. The vpi module loader in vvm needs to know this
 ## in order to know the name of the start symbol for the .vpi module.
@@ -98,6 +100,7 @@ AC_CHECK_FUNCS(lround nan)
 AC_CHECK_HEADERS(sys/resource.h)
 case "${host}" in *linux*) AC_DEFINE([LINUX], [1], [Host operating system is Linux.]) ;; esac
 
+
 # Linker option used when compiling the target
 AX_LD_RDYNAMIC