example-cxx works on Mac!

Using the global environment file, I was able to run most of the example and successfully test the BMI down to the end of https://babelizer.readthedocs.io/en/mdpiper-add-cxx-example/example-cxx.html#test-the-bmi.
csdms/babelizer#105

environment.yml

@@ -2,7 +2,9 @@
 name: wrap-all
 channels:
   - conda-forge
+  - nodefaults # Speeds solving env, by limiting the number of options
 dependencies:
+  # From examples in https://babelizer.readthedocs.io/en/mdpiper-add-cxx-example/
   - python>=3.10
   - make
   - cmake
@@ -11,11 +13,13 @@ dependencies:
   - bmi-c
   - cxx-compiler
   - bmi-cxx
-  # - fortran-compiler
-  # - bmi-fortran
+  - fortran-compiler
+  - bmi-fortran
   # - babelizer  # installs latest release. pip install below for dev
   - bmi-tester
-  - pymt>=1.3
+  # - pymt>=1.3  # Not installing for now, until it gets updated
+
+  # other dependancies to improve build workflow
   - gimli.units=0.3.1 # Before reorg (https://github.com/mcflugen/gimli/pull/18) 
                       # to prevent import error with pymt=1.3.1
 
@@ -26,4 +30,5 @@ dependencies:
   - pip
   - pip:
     # - -e git+https://github.com/csdms/babelizer.git@develop  # installs head of branch
+    # install head of `mdpiper/add-cxx-example` branch:
     - git+https://github.com/csdms/babelizer.git#111ed1b0f62e0a20ba373a465914ccbb5b17adb6

example-cxx/babel_heatcxx.toml

@@ -0,0 +1,41 @@
+# See https://babelizer.readthedocs.io/ for more information
+
+# Describe the library being wrapped.
+[library.HeatCxx]
+language = "c++"
+library = "bmiheatcxx"
+header = "bmi_heat.hxx"
+entry_point = "BmiHeat"
+
+# Describe compiler options need to build the library being wrapped.
+[build]
+undef_macros = []
+define_macros = []
+libraries = []
+library_dirs = []
+include_dirs = []
+extra_compile_args = []
+
+# Describe the newly wrapped package.
+[package]
+name = "pymt_heatcxx"
+requirements = []
+
+[info]
+github_username = "pymt-lab"
+package_author = "csdms"
+package_author_email = "[email protected]"
+package_license = "MIT License"
+summary = "PyMT component for the C++ heat model"
+
+[ci]
+python_version = [
+    "3.10",
+    "3.11",
+    "3.12",
+]
+os = [
+    "linux",
+    "mac",
+    "windows",
+]

example-cxx/test/config.txt

@@ -0,0 +1 @@
+1.5, 8.0, 6, 5