diff -Nur old/cantera-2.4.0/SConstruct new/cantera-2.4.0/SConstruct
--- old/SConstruct	2018-08-24 16:24:45.000000000 +0300
+++ new/SConstruct	2019-07-17 15:50:06.000000000 +0300
@@ -189,7 +189,7 @@
     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)
 
@@ -327,6 +327,14 @@
         'prefix',
         'Set this to the directory where Cantera should be installed.',
         defaults.prefix, PathVariable.PathAccept),
+    PathVariable(
+        'libdirname',
+        """Set this to the directory where Cantera libraries should be installed.
+           Some distributions (e.g. Fedora/RHEL) use 'lib64' instead of 'lib' on 64-bit systems
+           or could use some other library directory name instead of 'lib' depends
+           on architecture and profile (e.g. Gentoo 'libx32' on x32 profile).
+           If user didn't set 'libdirname' configuration variable set it to default value 'lib'""",
+        'lib', PathVariable.PathAccept),
     EnumVariable(
         'python_package',
         """If you plan to work in Python, then you need the ``full`` Cantera Python
@@ -723,10 +731,7 @@
 env['cantera_pure_version'] = '.'.join(str(x) for x in ctversion.version)
 env['cantera_short_version'] = '.'.join(str(x) for x in ctversion.version[:2])
 
-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:")
@@ -1061,7 +1066,7 @@
 
     # Ignore the minor version, e.g. 2.4.x -> 2.4
     env['sundials_version'] = '.'.join(sundials_version.split('.')[:2])
-    if env['sundials_version'] not in ('2.4','2.5','2.6','2.7','3.0','3.1'):
+    if env['sundials_version'] not in ('2.4','2.5','2.6','2.7','3.0','3.1','3.2'):
         print("""ERROR: Sundials version %r is not supported.""" % env['sundials_version'])
         sys.exit(1)
     print("""INFO: Using system installation of Sundials version %s.""" % sundials_version)
@@ -1465,12 +1470,6 @@
 # *** Set additional configuration variables ***
 # **********************************************
 
-# Some distributions (e.g. Fedora/RHEL) use 'lib64' instead of 'lib' on 64-bit systems
-if any(name.startswith('/usr/lib64/python') for name in sys.path):
-    env['libdirname'] = 'lib64'
-else:
-    env['libdirname'] = 'lib'
-
 # On Debian-based systems, need to special-case installation to
 # /usr/local because of dist-packages vs site-packages
 env['debian'] = any(name.endswith('dist-packages') for name in sys.path)
diff -Nur old/cantera-2.4.0/test_problems/SConscript new/cantera-2.4.0/test_problems/SConscript
--- old/test_problems/SConscript	2018-08-24 16:24:45.000000000 +0300
+++ new/test_problems/SConscript	2019-07-17 15:41:35.000000000 +0300
@@ -282,7 +282,7 @@
 CompileAndTest('VPsilane_test', 'VPsilane_test', 'VPsilane_test', 'output_blessed.txt')
 
 CompileAndTest('clib', 'clib_test', 'clib_test', 'output_blessed.txt',
-               extensions=['^clib_test.c'], libs=['cantera_shared'])
+               extensions=['^clib_test.c'])
 
 # Force explicitly-named tests to run even if SCons thinks they're up to date
 for command in COMMAND_LINE_TARGETS: