diff --git a/ports/cnl/CONTROL b/ports/cnl/CONTROL
new file mode 100644
index 0000000000..7aa93f60eb
--- /dev/null
+++ b/ports/cnl/CONTROL
@@ -0,0 +1,3 @@
+Source: cnl
+Version: 2019-01-09
+Description: A Compositional Numeric Library for C++
diff --git a/ports/cnl/portfile.cmake b/ports/cnl/portfile.cmake
new file mode 100644
index 0000000000..0eb23e1c9d
--- /dev/null
+++ b/ports/cnl/portfile.cmake
@@ -0,0 +1,28 @@
+# header-only library
+
+include(vcpkg_common_functions)
+
+vcpkg_from_github(
+    OUT_SOURCE_PATH SOURCE_PATH
+    REPO johnmcfarlane/cnl
+    REF 9f632898a4738b9e41de90e66d4f6ddb84bda08b
+    SHA512 ffde0b5aa58e79b5a03eee588c0e43d17ab2ddb2ffb12508f9d1b0e05aa54bb6c653986f183ce339e73c562efd749af6bd3907d816c9f79bf48f1e84ded3ac13
+    HEAD_REF develop
+)
+
+vcpkg_configure_cmake(
+    SOURCE_PATH ${SOURCE_PATH}
+    PREFER_NINJA
+)
+
+vcpkg_install_cmake()
+
+vcpkg_fixup_cmake_targets(CONFIG_PATH lib/cmake/${PORT})
+
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug ${CURRENT_PACKAGES_DIR}/lib)
+
+# Handle copyright
+configure_file(${SOURCE_PATH}/LICENSE_1_0.txt ${CURRENT_PACKAGES_DIR}/share/${PORT}/copyright COPYONLY)
+
+# CMake integration test
+vcpkg_test_cmake(PACKAGE_NAME ${PORT})