diff -Naur old/SConstruct new/SConstruct
--- old/SConstruct	2021-02-13 01:18:43.000000000 +0300
+++ new/SConstruct	2021-02-13 01:27:06.000000000 +0300
@@ -193,7 +193,7 @@
     toolchain = ['default']
 
 env = Environment(tools=toolchain+['textfile', 'subst', 'recursiveInstall', 'wix', 'gch'],
-                  ENV={'PATH': os.environ['PATH']},
+                  ENV={'PATH': os.environ['PATH'], 'CCACHE_DIR': os.environ.get('CCACHE_DIR','')},
                   toolchain=toolchain,
                   **extraEnvArgs)
 
@@ -724,10 +724,7 @@
 env['cantera_pure_version'] = re.match(r'(\d+\.\d+\.\d+)', env['cantera_version']).group(0)
 env['cantera_short_version'] = re.match(r'(\d+\.\d+)', env['cantera_version']).group(0)
 
-try:
-    env['git_commit'] = getCommandOutput('git', 'rev-parse', '--short', 'HEAD')
-except Exception:
-    env['git_commit'] = 'unknown'
+env['git_commit'] = 'unknown'
 
 # Print values of all build options:
 print("Configuration variables read from 'cantera.conf' and command line:")
diff -Naur old/interfaces/cython/SConscript new/interfaces/cython/SConscript
--- old/interfaces/cython/SConscript	2021-02-13 01:18:43.000000000 +0300
+++ new/interfaces/cython/SConscript	2021-02-13 01:59:29.000000000 +0300
@@ -108,8 +108,7 @@
     elif localenv['libdirname'] != 'lib':
         # 64-bit RHEL / Fedora etc. or e.g. x32 Gentoo profile
         extra = localenv.subst(
-            ' --prefix=${{python_prefix}}'
-            ' --install-lib=${{python_prefix}}/${{libdirname}}/python{}/site-packages'.format(py_version))
+            ' --prefix=${stage_dir}${prefix} --install-lib=${python_prefix}')
     else:
         extra = '--user'
         localenv.AppendENVPath(
diff -Naur old/test_problems/SConscript new/test_problems/SConscript
--- old/test_problems/SConscript	2021-02-13 01:18:43.000000000 +0300
+++ new/test_problems/SConscript	2021-02-13 01:42:19.000000000 +0300
@@ -222,7 +222,7 @@
 CompileAndTest('VPsilane_test')
 
 CompileAndTest('clib', 'clib_test', 'clib_test',
-               extensions=['^clib_test.c'], libs=['cantera_shared'])
+               extensions=['^clib_test.c'])
 
 # C++ Samples
 Test('cxx-bvp', 'cxx_samples', '#build/samples/cxx/bvp/blasius', None,
