diff '--color=auto' -Naur a/SConstruct b/SConstruct
--- a/SConstruct
+++ b/SConstruct
@@ -170,11 +170,7 @@
 
 cantera_git_commit = os.environ.get("CT_GIT_COMMIT")
 if not cantera_git_commit:
-    try:
-        cantera_git_commit = get_command_output("git", "rev-parse", "--short", "HEAD")
-        logger.info(f"Building Cantera from git commit {cantera_git_commit!r}")
-    except (subprocess.CalledProcessError, FileNotFoundError):
-        cantera_git_commit = "unknown"
+    cantera_git_commit = "unknown"
 else:
     logger.info(f"Building Cantera from git commit {cantera_git_commit!r}")
 
@@ -866,7 +862,7 @@
     toolchain = ["default"]
 
 env = Environment(tools=toolchain+["textfile", "subst", "recursiveInstall", "UnitsInterfaceBuilder", "wix", "gch"],
-                  ENV={"PATH": os.environ["PATH"]},
+                  ENV={'PATH': os.environ['PATH'], 'CCACHE_DIR': os.environ.get('CCACHE_DIR','')},
                   toolchain=toolchain,
                   **extraEnvArgs)
 
diff '--color=auto' -Naur a/src/SConscript b/src/SConscript
--- a/src/SConscript
+++ b/src/SConscript
@@ -90,7 +90,7 @@
     shim = pyenv.SharedObject("extensions/pythonShim.cpp")
     pylibname = f"../lib/cantera_python{pyenv['py_version_short'].replace('.', '_')}"
     lib = build(pyenv.SharedLibrary(pylibname, shim, SPAWN=get_spawn(pyenv)))
-    install("$inst_shlibdir", lib)
+    install("$inst_shlibdir/cantera", lib)
 
 
 # build the Cantera static library