diff --git a/configure.in b/configure.in
index 0ad186231..a80bb3dd2 100644
--- a/configure.in
+++ b/configure.in
@@ -7,13 +7,25 @@ AC_PROG_CXX
 AC_CHECK_TOOL(STRIP, strip, true)
 AC_CHECK_HEADERS(getopt.h)
 AC_CHECK_HEADER(ipal.h, HAVE_IPAL=yes, HAVE_IPAL=)
+AC_SUBST(HAVE_IPAL)
 AC_PROG_INSTALL
-AC_CHECK_LIB(dl,main,[DLLIB=-ldl])
+
+# --
+# Look for a dl library to use. First look for the standard dlopen
+# functions, and failing that look for the HP specific shl_load function.
+
+AC_CHECK_HEADERS(dlfcn.h dl.h, break)
+
+DLLIB=''
+AC_CHECK_LIB(dl,dlopen,[DLLIB=-ldl])
+if test -z "$DLLIB" ; then
+AC_CHECK_LIB(dld,shl_load,[DLLIB=-ldld])
+fi
 AC_SUBST(DLLIB)
+
 AC_CANONICAL_HOST
 # $host
 
-AC_SUBST(HAVE_IPAL)
 
 #######################
 ## test for underscores. The vpi module loader in vvm needs to know this
@@ -22,6 +34,7 @@ AC_SUBST(HAVE_IPAL)
 
 AC_CYGWIN
 AC_EXEEXT
+AC_SUBST(CYGWIN)
 AC_SUBST(EXEEXT)
 
 AC_MSG_CHECKING("for leading and/or trailing underscores")
@@ -39,14 +52,7 @@ if test ! -z "$output" -a -z "$CYGWIN" ; then
   AC_DEFINE(NEED_LU)
 fi
 
-PICFLAG=-fPIC
 
-if test ! -z "$CYGWIN" ; then
-  PICFLAG=
-fi
-
-AC_SUBST(CYGWIN)
-AC_SUBST(PICFLAG)
 
 output=`nm underscore.o|grep underscore_ 2>&1`
 if test ! -z "$output"; then
@@ -69,6 +75,26 @@ AC_MSG_RESULT("$CC_LEADING_UNDERSCORE $CC_TRAILING_UNDERSCORE")
 ## end of test for underscores
 #######################
 
+# The -fPIC flag is used to tell the compiler to make position
+# independent code. It is needed when making shared objects.
+
+AC_MSG_CHECKING("for flag to make position independent code")
+PICFLAG=-fPIC
+case "${host}" in
+
+     *-*-cygwin*)
+	PICFLAG=
+	;;
+
+     *-*-hpux*)
+	PICFLAG=+z
+	;;
+
+esac
+AC_SUBST(PICFLAG)
+AC_MSG_RESULT($PICFLAG)
+
+
 # The -rdynamic flag is used by iverilog when compiling the target,
 # to know how to export symbols of the main program to loadable modules
 # that are brought in by -ldl
@@ -89,18 +115,25 @@ case "${host}" in
 	rdynamic=""
 	;;
 
+    *-*-hpux*)
+	rdynamic="-E"
+	;;
 esac
-
 AC_SUBST(rdynamic)
-
 AC_MSG_RESULT($rdynamic)
 
-AC_MSG_CHECKING("for shared library build flag")
+AC_MSG_CHECKING("for shared library link flag")
 shared=-shared
 case "${host}" in
+
      *-*-cygwin*)
         shared="-mdll -Wl,--enable-auto-image-base"
 	;;
+
+     *-*-hpux*)
+	shared="-b"
+	;;
+
 esac
 
 AC_SUBST(shared)
diff --git a/t-dll.cc b/t-dll.cc
index 46e5cdbc5..080b8e2ce 100644
--- a/t-dll.cc
+++ b/t-dll.cc
@@ -17,14 +17,38 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #if !defined(WINNT) && !defined(macintosh)
-#ident "$Id: t-dll.cc,v 1.21 2000/12/14 23:23:07 steve Exp $"
+#ident "$Id: t-dll.cc,v 1.22 2000/12/15 05:45:25 steve Exp $"
 #endif
 
 # include  "compiler.h"
 # include  "t-dll.h"
-# include  <dlfcn.h>
 # include  <malloc.h>
 
+#if defined(HAVE_DLFCN_H)
+inline ivl_dll_t ivl_dlopen(const char*name)
+{ return dlopen(name,RTLD_NOW); }
+
+inline void* ivl_dlsym(ivl_dll_t dll, const char*nm)
+{ return dlsym(dll, nm); }
+
+inline void ivl_dlclose(ivl_dll_t dll)
+{ dlclose(dll); }
+
+#elif defined(HAVE_DL_H)
+inline ivl_dll_t ivl_dlopen(const char*name)
+{ return shl_load(name, BIND_IMMEDIATE, 0); }
+
+inline void* ivl_dlsym(ivl_dll_t dll, const char*nm)
+{
+      void*sym;
+      int rc = shl_findsym(&dll, nm, TYPE_PROCEDURE, &sym);
+      return (rc == 0) ? sym : 0;
+}
+
+inline void ivl_dlclose(ivl_dll_t dll)
+{ shl_unload(dll); }
+#endif
+
 static struct dll_target dll_target_obj;
 
 /*
@@ -149,7 +173,7 @@ static void scope_add_lpm(ivl_scope_t scope, ivl_lpm_t net)
 bool dll_target::start_design(const Design*des)
 {
       dll_path_ = des->get_flag("DLL");
-      dll_ = dlopen(dll_path_.c_str(), RTLD_NOW);
+      dll_ = ivl_dlopen(dll_path_.c_str());
       if (dll_ == 0) {
 	    cerr << dll_path_ << ": " << dlerror() << endl;
 	    return false;
@@ -170,7 +194,7 @@ bool dll_target::start_design(const Design*des)
       des_.root_->nlpm_ = 0;
       des_.root_->lpm_ = 0;
 
-      target_ = (target_design_f)dlsym(dll_, LU "target_design" TU);
+      target_ = (target_design_f)ivl_dlsym(dll_, LU "target_design" TU);
       if (target_ == 0) {
 	    cerr << dll_path_ << ": error: target_design entry "
 		  "point is missing." << endl;
@@ -187,7 +211,7 @@ bool dll_target::start_design(const Design*des)
 void dll_target::end_design(const Design*)
 {
       (target_)(&des_);
-      dlclose(dll_);
+      ivl_dlclose(dll_);
 }
 
 /*
@@ -617,6 +641,9 @@ extern const struct target tgt_dll = { "dll", &dll_target_obj };
 
 /*
  * $Log: t-dll.cc,v $
+ * Revision 1.22  2000/12/15 05:45:25  steve
+ *  Autoconfigure the dlopen functions.
+ *
  * Revision 1.21  2000/12/14 23:23:07  steve
  *  Support more logic gate types.
  *
diff --git a/t-dll.h b/t-dll.h
index 3b1980fe3..a78954e69 100644
--- a/t-dll.h
+++ b/t-dll.h
@@ -19,12 +19,20 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #if !defined(WINNT) && !defined(macintosh)
-#ident "$Id: t-dll.h,v 1.19 2000/12/05 06:29:33 steve Exp $"
+#ident "$Id: t-dll.h,v 1.20 2000/12/15 05:45:25 steve Exp $"
 #endif
 
 # include  "target.h"
 # include  "ivl_target.h"
 
+#if defined(HAVE_DLFCN_H)
+# include  <dlfcn.h>
+typedef void* ivl_dll_t;
+#elif defined(HAVE_DL_H)
+# include  <dl.h>
+typedef shl_t ivl_dll_t;
+#endif
+
 struct ivl_design_s {
 
       ivl_scope_t root_;
@@ -58,7 +66,7 @@ struct dll_target  : public target_t, public expr_scan_t {
       void scope(const NetScope*);
       void signal(const NetNet*);
 
-      void*dll_;
+      ivl_dll_t dll_;
       string dll_path_;
 
       ivl_design_s des_;
@@ -355,6 +363,9 @@ struct ivl_statement_s {
 
 /*
  * $Log: t-dll.h,v $
+ * Revision 1.20  2000/12/15 05:45:25  steve
+ *  Autoconfigure the dlopen functions.
+ *
  * Revision 1.19  2000/12/05 06:29:33  steve
  *  Make signal attributes available to ivl_target API.
  *