error in setup.py when git command is not available

dispaset/__init__.py

@@ -64,11 +64,15 @@
 try:
     from setuptools_scm import get_version
     import warnings
+    from shutil import which
     with warnings.catch_warnings():
         warnings.simplefilter("ignore")
-        version = get_version(version_scheme='post-release',
-                              local_scheme=lambda version: version.format_choice("" if version.exact else "+{node}", "+dirty"),
-                              root='..', relative_to=__file__)
+        if which('git') is not None:
+            version = get_version(version_scheme='post-release',
+                                  local_scheme=lambda version: version.format_choice("" if version.exact else "+{node}", "+dirty"),
+                                  root='..', relative_to=__file__)
+        else:
+            version='N/A'
 except (ImportError, LookupError):
     try:
         from pkg_resources import get_distribution, DistributionNotFound

environment.yml

@@ -8,7 +8,7 @@ dependencies:
   - scipy>=0.15
   - matplotlib>=1.5.1
   - pandas>= 0.19
-  - xlrd >= 0.9
+  - xlrd = 1.2.0
   - xarray >= 0.11
   - netcdf4
   - pyyaml >= 5.1

setup.py

@@ -44,6 +44,7 @@ def read(*parts):
         "xlrd >= 0.9",
         "matplotlib >= 1.5.1",
         "gdxcc >= 7",
+	"xlrd == 1.2.0",
         "gamsxcc",
         "optcc",
         "setuptools_scm",