diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 56cfe9c..af875df 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,6 +16,7 @@ jobs:
         ./py/bin/pip install -U ivpm
         ./py/bin/python3 -m ivpm update -a
         ./packages/python/bin/pip install -U typing_extensions build
+        ./packages/python/bin/pip install pcpp cxxheaderparser
         ./packages/python/bin/python3 setup.py build_ext --inplace
         ./packages/python/bin/python3 -m build -n
         ls src
diff --git a/ivpm.yaml b/ivpm.yaml
index a113253..d5964a6 100644
--- a/ivpm.yaml
+++ b/ivpm.yaml
@@ -8,14 +8,6 @@ package:
 
   dep-sets:
 
-  - name: default
-    deps:
-    - name: pytest
-      src: pypi
-        #    - name: pyvsc-dataclasses
-        #      src: pypi
-    - name: fusesoc
-      src: pypi
 
   - name: default-dev
     deps:
@@ -35,7 +27,6 @@ package:
       url: https://github.com/dv-flow/dv-flow-libhdlsim.git
     - name: dv-flow-mgr
       url: https://github.com/dv-flow/dv-flow-mgr.git
-      branch: mballance/taskdeps
     - name: verilator
       url: https://github.com/edapack/verilator-bin
       src: gh-rls
@@ -107,6 +98,15 @@ package:
     - name: doxygen-filter-sv
       url: https://github.com/SeanOBoyle/DoxygenFilterSystemVerilog.git
 
+  - name: default
+    deps:
+    - name: pytest
+      src: pypi
+        #    - name: pyvsc-dataclasses
+        #      src: pypi
+    - name: fusesoc
+      src: pypi
+
   env:
     - name: PATH
       path-prepend: 
diff --git a/src/hdl_if/impl/call/gen_sv_class.py b/src/hdl_if/impl/call/gen_sv_class.py
index cbcaa28..d36a7ba 100644
--- a/src/hdl_if/impl/call/gen_sv_class.py
+++ b/src/hdl_if/impl/call/gen_sv_class.py
@@ -37,6 +37,7 @@ def __init__(self, out, ind="", uvm=False, deprecated=False):
         self._deprecated = deprecated
         self._have_imp = False
         self._struct_types = set()  # Track struct types used in API
+        self._emitted_struct_types = set()  # Track struct types already emitted (across multiple gen() calls)
         pass
 
     def _collect_methods(self, api: ApiDef):
@@ -93,16 +94,20 @@ def gen(self, api : ApiDef):
         # Collect struct types used in the API
         self._collect_struct_types(api)
         
-        # Generate struct typedefs
-        if self._struct_types:
-            for struct_type in sorted(self._struct_types, key=lambda t: t.__name__):
+        # Generate struct typedefs only for types not already emitted
+        new_struct_types = self._struct_types - self._emitted_struct_types
+        if new_struct_types:
+            for struct_type in sorted(new_struct_types, key=lambda t: t.__name__):
                 self.gen_struct_typedef(struct_type)
                 self.println()
             
-            # Generate conversion functions for each struct
-            for struct_type in sorted(self._struct_types, key=lambda t: t.__name__):
+            # Generate conversion functions for each new struct
+            for struct_type in sorted(new_struct_types, key=lambda t: t.__name__):
                 self.gen_struct_conversion_functions(struct_type)
                 self.println()
+            
+            self._emitted_struct_types.update(new_struct_types)
+        self._struct_types = set()
 
         # Existing class generation (unchanged)
 #        self.gen_class_interface_exp(api)
diff --git a/src/hdl_if/share/dpi/pyhdl_if.sv b/src/hdl_if/share/dpi/pyhdl_if.sv
index 7829538..417e6a9 100644
--- a/src/hdl_if/share/dpi/pyhdl_if.sv
+++ b/src/hdl_if/share/dpi/pyhdl_if.sv
@@ -207,7 +207,7 @@ package pyhdl_if;
     function automatic PyObject pyhdl_pi_if_HandleErr(PyObject obj);
         if (obj == null) begin
             $display("--> HandleErr");
-            $stacktrace;
+            `STACKTRACE;
             PyErr_Print();
             $display("<-- HandleErr");
         end
diff --git a/src/hdl_if/share/dpi/pyhdl_if_macros.svh b/src/hdl_if/share/dpi/pyhdl_if_macros.svh
index 7e410ba..1501f17 100644
--- a/src/hdl_if/share/dpi/pyhdl_if_macros.svh
+++ b/src/hdl_if/share/dpi/pyhdl_if_macros.svh
@@ -29,7 +29,11 @@
     $display x ; \
     $finish ;
 
+`ifdef XILINX_SIMULATOR
+`define STACKTRACE $display("TODO: no stacktrace support in Xilinx simulator")
+`else
 `define STACKTRACE $stacktrace
+`endif
 
 
 `endif /* INCLUDED_PYHDL_IF_MACROS_SVH */
diff --git a/tests/unit/data/test_struct/struct_bfm.sv b/tests/unit/data/test_struct/struct_bfm.sv
index c425b8a..5309de4 100644
--- a/tests/unit/data/test_struct/struct_bfm.sv
+++ b/tests/unit/data/test_struct/struct_bfm.sv
@@ -30,8 +30,8 @@ module struct_bfm
     Point_t     stored_point;
 
     initial begin
-        StructBFM_Impl impl = new();
-        StructTest_exp_impl test;
+        automatic StructBFM_Impl impl = new();
+        automatic StructTest_exp_impl test;
         int fd;
         string line;
         
diff --git a/tests/unit/data/test_struct/struct_comprehensive_bfm.sv b/tests/unit/data/test_struct/struct_comprehensive_bfm.sv
index 98dcecf..7603a9b 100644
--- a/tests/unit/data/test_struct/struct_comprehensive_bfm.sv
+++ b/tests/unit/data/test_struct/struct_comprehensive_bfm.sv
@@ -90,8 +90,8 @@ module struct_comprehensive_bfm
     ComprehensiveBFM_imp_impl#(ComprehensiveBFM_Impl) bfm;
 
     initial begin
-        ComprehensiveBFM_Impl impl = new();
-        ComprehensiveTest_exp_impl test;
+        automatic ComprehensiveBFM_Impl impl = new();
+        automatic ComprehensiveTest_exp_impl test;
         int fd;
         string line;
         
diff --git a/tests/unit/test_api_gen_sv_filtering.py b/tests/unit/test_api_gen_sv_filtering.py
index 1a137d4..177e71f 100644
--- a/tests/unit/test_api_gen_sv_filtering.py
+++ b/tests/unit/test_api_gen_sv_filtering.py
@@ -450,3 +450,45 @@ def __init__(self):
         assert len(filtered) == 3
         names = [a.name for a in filtered]
         assert names == ["First", "Second", "Third"]
+
+    def test_no_duplicate_struct_typedefs_across_apis(self):
+        """Test that struct typedefs are not duplicated when multiple APIs share the same struct type."""
+
+        class Point(ct.Structure):
+            _fields_ = [
+                ("x", ct.c_int32),
+                ("y", ct.c_int32),
+            ]
+
+        @api
+        class FirstAPI(object):
+            @imp
+            async def func1(self, pt: Point):
+                pass
+
+        @api
+        class SecondAPI(object):
+            @exp
+            def func2(self, pt: Point):
+                pass
+
+        all_apis = ApiDefRgy.inst().getApis()
+
+        out = io.StringIO()
+        gen = GenSVClass(out, ind="", uvm=False, deprecated=False)
+        for a in all_apis:
+            gen.gen(a)
+        sv_content = out.getvalue()
+
+        # Count occurrences of the struct typedef — must appear exactly once
+        typedef_count = sv_content.count("typedef struct")
+        assert typedef_count == 1, (
+            f"Expected 1 struct typedef for Point_t, but found {typedef_count}. "
+            f"Duplicate typedefs cause SV compilation errors."
+        )
+        # Conversion function definitions must also appear exactly once
+        # (the name may also appear in calls within API method bodies)
+        assert sv_content.count("function Point_t pyhdl_if_py_to_struct_Point") == 1, \
+            "pyhdl_if_py_to_struct_Point conversion function definition duplicated"
+        assert sv_content.count("function pyhdl_if::PyObject pyhdl_if_struct_to_py_Point") == 1, \
+            "pyhdl_if_struct_to_py_Point conversion function definition duplicated"