diff --git a/idma.mk b/idma.mk
index 04f0bdd9..e76fab2a 100644
--- a/idma.mk
+++ b/idma.mk
@@ -17,6 +17,24 @@ VERILATOR   ?= verilator
 VLOGAN      ?= vlogan
 VSIM        ?= vsim
 
+# Provision a local uv venv when the generator deps are not already available.
+IDMA_VENV_PY := $(IDMA_ROOT)/.venv/bin/python
+ifeq ($(shell $(PYTHON) -c 'import mako' >/dev/null 2>&1 && echo ok),ok)
+else ifeq ($(shell $(IDMA_VENV_PY) -c 'import mako' >/dev/null 2>&1 && echo ok),ok)
+  PYTHON      := $(IDMA_VENV_PY)
+  export PATH := $(IDMA_ROOT)/.venv/bin:$(PATH)
+else ifeq ($(shell command -v uv >/dev/null 2>&1 && echo ok),ok)
+  $(info iDMA: provisioning the generator environment (uv sync --locked) ...)
+  _idma_uv_sync := $(shell cd $(IDMA_ROOT) && uv sync --locked 1>&2 || echo FAIL)
+  ifeq ($(_idma_uv_sync),FAIL)
+    $(error iDMA: 'uv sync --locked' failed; see output above)
+  endif
+  PYTHON      := $(IDMA_VENV_PY)
+  export PATH := $(IDMA_ROOT)/.venv/bin:$(PATH)
+else
+  $(error iDMA RTL generation needs 'uv' (https://docs.astral.sh/uv) on PATH, or a venv with the pyproject.toml deps activated)
+endif
+
 # Shell
 SHELL := /bin/bash