diff --git a/CMake/FindMMESH.cmake b/CMake/FindMMESH.cmake
new file mode 100644
index 00000000..e2a714a5
--- /dev/null
+++ b/CMake/FindMMESH.cmake
@@ -0,0 +1,94 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+#[=======================================================================[.rst:
+FindMMESH
+--------
+
+Find the native MMESH includes and library.
+
+IMPORTED Targets
+^^^^^^^^^^^^^^^^
+
+This module defines :prop_tgt:`IMPORTED` target ``MMESH::MMESH``, if
+MMESH has been found.
+
+Result Variables
+^^^^^^^^^^^^^^^^
+
+This module defines the following variables:
+
+::
+
+  MMESH_INCLUDE_DIRS   - where to find meshdecimation.h, etc.
+  MMESH_LIBRARIES      - List of libraries when using mmesh.
+  MMESH_FOUND          - True if mmesh found.
+
+Hints
+^^^^^
+
+A user may set ``MMESH_ROOT`` to a mmesh installation root to tell this
+module where to look.
+#]=======================================================================]
+
+set(_MMESH_SEARCHES)
+
+# Search MMESH_ROOT first if it is set.
+if(MMESH_ROOT)
+  set(_MMESH_SEARCH_ROOT PATHS ${MMESH_ROOT} NO_DEFAULT_PATH)
+  list(APPEND _MMESH_SEARCHES _MMESH_SEARCH_ROOT)
+endif()
+
+set(MMESH_NAMES mmesh)
+
+# Try each search configuration.
+foreach(search ${_MMESH_SEARCHES})
+	find_path(MMESH_INCLUDE_DIR NAMES meshdecimation.h ${${search}} PATH_SUFFIXES include include/mmesh mmesh)
+endforeach()
+
+# Allow MMESH_LIBRARY to be set manually, as the location of the openNURBS library
+if(NOT MMESH_LIBRARY)
+  foreach(search ${_MMESH_SEARCHES})
+    find_library(MMESH_LIBRARY NAMES ${MMESH_NAMES} NAMES_PER_DIR ${${search}} PATH_SUFFIXES lib)
+  endforeach()
+endif()
+
+unset(MMESH_NAMES)
+
+mark_as_advanced(MMESH_INCLUDE_DIR)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(MMESH REQUIRED_VARS MMESH_LIBRARY MMESH_INCLUDE_DIR)
+
+if(MMESH_FOUND)
+    set(MMESH_INCLUDE_DIRS ${MMESH_INCLUDE_DIR})
+
+    if(NOT MMESH_LIBRARIES)
+      set(MMESH_LIBRARIES ${MMESH_LIBRARY})
+    endif()
+
+    if(NOT TARGET MMESH::MMESH)
+      add_library(MMESH::MMESH UNKNOWN IMPORTED)
+      set_target_properties(MMESH::MMESH PROPERTIES
+        INTERFACE_INCLUDE_DIRECTORIES "${MMESH_INCLUDE_DIRS}")
+
+      if(MMESH_LIBRARY_RELEASE)
+        set_property(TARGET MMESH::MMESH APPEND PROPERTY
+          IMPORTED_CONFIGURATIONS RELEASE)
+        set_target_properties(MMESH::MMESH PROPERTIES
+          IMPORTED_LOCATION_RELEASE "${MMESH_LIBRARY_RELEASE}")
+      endif()
+
+      if(MMESH_LIBRARY_DEBUG)
+        set_property(TARGET MMESH::MMESH APPEND PROPERTY
+          IMPORTED_CONFIGURATIONS DEBUG)
+        set_target_properties(MMESH::MMESH PROPERTIES
+          IMPORTED_LOCATION_DEBUG "${MMESH_LIBRARY_DEBUG}")
+      endif()
+
+      if(NOT MMESH_LIBRARY_RELEASE AND NOT MMESH_LIBRARY_DEBUG)
+        set_property(TARGET MMESH::MMESH APPEND PROPERTY
+          IMPORTED_LOCATION "${MMESH_LIBRARY}")
+      endif()
+    endif()
+endif()
diff --git a/CMakeLists.txt b/CMakeLists.txt
index e9c256a5..8bfcdbcd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -639,6 +639,10 @@ add_project(pugixml GROUPS "BRLCAD;APPLESEED")
 # https://github.com/assimp/assimp
 add_project(assetimport GROUPS "BRLCAD")
 
+# mmesh - mesh optimization and decimation library
+# https://github.com/BRL-CAD/mmesh
+add_project(mmesh GROUPS "BRLCAD")
+
 # OpenCV - Open Source Computer Vision Library
 # http://opencv.org
 add_project(opencv GROUPS "BRLCAD_EXTRA")
diff --git a/mmesh/CMakeLists.txt b/mmesh/CMakeLists.txt
new file mode 100644
index 00000000..716bbc69
--- /dev/null
+++ b/mmesh/CMakeLists.txt
@@ -0,0 +1,50 @@
+cad_enable(MMESH "librt")
+
+bext_enable(MMESH)
+
+# Decision made
+
+if (ENABLE_MMESH)
+
+  git_submodule_init(mmesh src/mmcore.c)
+
+  TargetDeps(MMESH)
+
+  ExternalProject_Add(MMESH_BLD
+    URL "${CMAKE_CURRENT_SOURCE_DIR}/mmesh"
+    BUILD_ALWAYS ${EXT_BUILD_ALWAYS} ${LOG_OPTS}
+    #PATCH_COMMAND ${PATCH_EXECUTABLE};-E;-p1;${PATCH_OPTIONS};-i;${CMAKE_CURRENT_SOURCE_DIR}/mmesh.patch
+    CMAKE_ARGS
+    ${BUILD_TYPE_SPECIFIER}
+    -DBIN_DIR=${BIN_DIR}
+    -DLIB_DIR=${LIB_DIR}
+    -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+    -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
+    -DCMAKE_INSTALL_PREFIX=${CMAKE_BUNDLE_INSTALL_PREFIX}
+    -DCMAKE_INSTALL_LIBDIR:PATH=${LIB_DIR}
+    -DCMAKE_INSTALL_RPATH=${CMAKE_BUNDLE_INSTALL_PREFIX}/${LIB_DIR}
+    LOG_CONFIGURE ${EXT_BUILD_QUIET}
+    LOG_BUILD ${EXT_BUILD_QUIET}
+    LOG_INSTALL ${EXT_BUILD_QUIET}
+    LOG_OUTPUT_ON_FAILURE ${EXT_BUILD_QUIET}
+    STEP_TARGETS install
+    )
+
+  TargetInstallDeps(MMESH MMESH_DEPENDS)
+
+  # Copy the license into position in CMAKE_BUNDLE_INSTALL_PREFIX
+  configure_file(
+    ${CMAKE_CURRENT_SOURCE_DIR}/mmesh/LICENSE
+    ${DOC_LICENSE_DIR}/mmesh.txt
+    COPYONLY
+    )
+
+endif (ENABLE_MMESH)
+
+# Local Variables:
+# tab-width: 8
+# mode: cmake
+# indent-tabs-mode: t
+# End:
+# ex: shiftwidth=2 tabstop=8
+
diff --git a/mmesh/mmesh.deps b/mmesh/mmesh.deps
new file mode 100644
index 00000000..ecdeab5f
--- /dev/null
+++ b/mmesh/mmesh.deps
@@ -0,0 +1,2 @@
+PATCH
+