diff --git a/Makefile.in b/Makefile.in
index 89d272e2d..f3dcf7b70 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -19,6 +19,7 @@ LIBS=@LIBS@
 ## -lrt is for timer_create and timer_settime
 LDFLAGS=@LDFLAGS@ -lpthread -fopenmp
 LDFLAGS_EXTRA=
+PREFIX=@prefix@
 #########################
 
 Z3=z3
@@ -435,3 +436,31 @@ checkgmake:
 	@ ./gmaketest --make=$(MAKE) || \
           (echo "Z3 needs GNU-Make to be built"; exit 1)
 
+################################
+#
+# installation/uninstallation
+#
+################################
+
+install: $(BIN_DIR)/$(Z3) $(BIN_DIR)/lib$(Z3).so  $(BIN_DIR)/lib$(Z3).a
+	@mkdir -p $(PREFIX)/bin
+	@mkdir -p $(PREFIX)/lib
+	@mkdir -p $(PREFIX)/include
+	@cp $(BIN_DIR)/$(Z3) $(PREFIX)/bin
+	@cp $(BIN_DIR)/lib$(Z3).so $(PREFIX)/lib
+	@cp $(BIN_DIR)/lib$(Z3).a $(PREFIX)/lib
+	@cp lib/z3_api.h    $(PREFIX)/include
+	@cp lib/z3.h        $(PREFIX)/include
+	@cp lib/z3_v1.h     $(PREFIX)/include
+	@cp lib/z3_macros.h $(PREFIX)/include
+	@cp c++/z3++.h      $(PREFIX)/include
+
+uninstall:
+	@rm -f $(PREFIX)/bin/$(Z3)
+	@rm -f $(PREFIX)/lib/lib$(Z3).so
+	@rm -f $(PREFIX)/lib/lib$(Z3).a
+	@rm -f $(PREFIX)/include/z3_api.h
+	@rm -f $(PREFIX)/include/z3.h
+	@rm -f $(PREFIX)/include/z3_v1.h
+	@rm -f $(PREFIX)/include/z3_macros.h
+	@rm -f $(PREFIX)/include/z3++.h
diff --git a/README b/README
index 14cf735c5..696f8e0e8 100644
--- a/README
+++ b/README
@@ -19,33 +19,26 @@ Z3 can be built using Visual Studio Command Prompt, Visual Studio and make/gcc.
     msbuild z3-prover.sln 
   All components will be located at /debug
 
-1) Building Z3 using g++/make
+2) Building Z3 using g++/make
 Your machine must also have the following commands to be able to build Z3:
 autoconf, sed, awk, dos2unix commands
 
-
-- Open a shell
-- For building the z3 executable, execute
- 
   autoconf
   ./configure
   make
+  sudo make install
 
-The z3 executable will be located at bin/external/
+It will install z3 executable at /usr/local/bin, libraries at /usr/local/lib, and include files at /usr/local/include.
+Use the following commands to install in a different prefix (e.g., /usr).
 
-- If you want a static library for Z3
+  autoconf
+  ./configure --prefix=/usr
+  make
+  sudo make install
 
-  make a
+To uninstall z3, use
 
-- If you also want the z3 shared library, execute
-
-  make so
-
-  for libz3.so (on Linux)
-
-  make dylib
-
-  for libz3.dylib (on OSX)
+  sudo make uninstall
 
 Remark: the Z3 makefile imports the source file list from Visual Studio project files.
 To add new source files to the Z3 core, you must include them at: lib/lib.vcxproj
diff --git a/lib/goal.cpp b/lib/goal.cpp
index 0146ac252..a84b34dd5 100644
--- a/lib/goal.cpp
+++ b/lib/goal.cpp
@@ -284,6 +284,30 @@ void goal::display_with_dependencies(cmd_context & ctx, std::ostream & out) cons
     out << "\n  :precision " << prec() << " :depth " << depth() << ")" << std::endl;
 }
 
+void goal::display_with_dependencies(std::ostream & out) const {
+    ptr_vector<expr> deps;
+    out << "(goal";
+    unsigned sz = size();
+    for (unsigned i = 0; i < sz; i++) {
+        out << "\n  |-";
+        deps.reset();
+        m().linearize(dep(i), deps);
+        ptr_vector<expr>::iterator it  = deps.begin();
+        ptr_vector<expr>::iterator end = deps.end();
+        for (; it != end; ++it) {
+            expr * d = *it;
+            if (is_uninterp_const(d)) {
+                out << " " << mk_ismt2_pp(d, m());
+            }
+            else {
+                out << " #" << d->get_id();
+            }
+        }
+        out << "\n  " << mk_ismt2_pp(form(i), m(), 2);
+    }
+    out << "\n  :precision " << prec() << " :depth " << depth() << ")" << std::endl;
+}
+
 void goal::display(cmd_context & ctx) const {
     display(ctx, ctx.regular_stream());
 }
@@ -473,7 +497,7 @@ void goal::elim_redundancies() {
                     proof * prs[2] = { pr(get_idx(atom)), pr(i) };
                     p = m().mk_unit_resolution(2, prs);
                 }
-                expr_dependency * d = 0;
+                expr_dependency_ref d(m());
                 if (unsat_core_enabled())
                     d = m().mk_join(dep(get_idx(atom)), dep(i));
                 push_back(m().mk_false(), p, d);                    
@@ -490,7 +514,7 @@ void goal::elim_redundancies() {
                     proof * prs[2] = { pr(get_not_idx(f)), pr(i) };
                     p = m().mk_unit_resolution(2, prs);
                 }
-                expr_dependency * d = 0;
+                expr_dependency_ref d(m());
                 if (unsat_core_enabled())
                     d = m().mk_join(dep(get_not_idx(f)), dep(i));
                 push_back(m().mk_false(), p, d);
diff --git a/lib/goal.h b/lib/goal.h
index 9beb9421e..61c7e2081 100644
--- a/lib/goal.h
+++ b/lib/goal.h
@@ -180,6 +180,7 @@ public:
     void display_dimacs(std::ostream & out) const;
     void display_with_dependencies(cmd_context & ctx, std::ostream & out) const;
     void display_with_dependencies(cmd_context & ctx) const;
+    void display_with_dependencies(std::ostream & out) const;
 
     bool sat_preserved() const { 
         return prec() == PRECISE || prec() == UNDER; 
diff --git a/lib/simplify_tactic.cpp b/lib/simplify_tactic.cpp
index 2a912822b..a7ce0b39f 100644
--- a/lib/simplify_tactic.cpp
+++ b/lib/simplify_tactic.cpp
@@ -67,6 +67,7 @@ struct simplify_tactic::imp {
         TRACE("after_simplifier_bug", g.display(tout););
         g.elim_redundancies();
         TRACE("after_simplifier", g.display(tout););
+        TRACE("after_simplifier_detail", g.display_with_dependencies(tout););
         SASSERT(g.is_well_sorted());
     }