diff --git a/platform/posix/SConscript b/platform/posix/SConscript
index 0d55079b4c..90cc845456 100644
--- a/platform/posix/SConscript
+++ b/platform/posix/SConscript
@@ -83,16 +83,10 @@ if localenv["package_build"]:
     # conda package for now.
     # Users should compile against their local SDKs, which should be backwards
     # compatible with the SDK used for building.
-    cc_flags = []
-    for flag in localenv["CCFLAGS"]:
-        if not flag.startswith(("-isysroot", "-mmacosx", "/App")):
-            cc_flags.append(flag)
-    localenv["CCFLAGS"] = cc_flags
-    cc_flags = []
-    for flag in localenv["CXXFLAGS"]:
-        if not flag.startswith(("-isysroot", "-mmacosx", "/App")):
-            cc_flags.append(flag)
-    localenv["CXXFLAGS"] = cc_flags
+    excludes = (
+        "-isysroot", "-mmacosx", "-march", "-mtune", "-fdebug-prefix-map")
+    localenv["CCFLAGS"] = compiler_flag_list(localenv["CCFLAGS"], excludes)
+    localenv["CXXFLAGS"] = compiler_flag_list(localenv["CXXFLAGS"], excludes)
 
 mak = build(localenv.SubstFile('Cantera.mak', 'Cantera.mak.in'))
 install('$inst_incdir', mak)
diff --git a/samples/cxx/SConscript b/samples/cxx/SConscript
index a6a3de0a6b..bd0d98c973 100644
--- a/samples/cxx/SConscript
+++ b/samples/cxx/SConscript
@@ -59,24 +59,9 @@ set(CMAKE_EXE_LINKER_FLAGS ${CMAKE_EXE_LINKER_FLAGS} ${OpenMP_EXE_LINKER_FLAGS})
         # conda package for now.
         # Users should compile against their local SDKs, which should be backwards
         # compatible with the SDK used for building.
-        def split_compiler_flags(flags, excludes=[]):
-            """
-            Separate concatenated compiler flags in flag list.
-            Entries listed in 'exclude' are omitted.
-            """
-            flags = " ".join(flags)
-            flags = f" {flags}".split(" -")[1:]
-            # split concatenated entries
-            flags = [f"-{flag}" for flag in flags]
-            cc_flags = []
-            for flag in flags:
-                if not flag.startswith(excludes) and flag not in cc_flags:
-                    cc_flags.append(flag)
-            return cc_flags
-
         excludes = (
             "-isysroot", "-mmacosx", "-march", "-mtune", "-fdebug-prefix-map")
-        cc_flags = split_compiler_flags(localenv["CCFLAGS"] + localenv["CXXFLAGS"],
+        cc_flags = compiler_flag_list(localenv["CCFLAGS"] + localenv["CXXFLAGS"],
             excludes)
     else:
         incdirs.extend([localenv["sundials_include"], localenv["boost_inc_dir"]])
diff --git a/site_scons/buildutils.py b/site_scons/buildutils.py
index 2c5eb5c1b8..899b743a73 100644
--- a/site_scons/buildutils.py
+++ b/site_scons/buildutils.py
@@ -25,7 +25,7 @@
            "logger", "remove_directory", "remove_file", "test_results",
            "add_RegressionTest", "get_command_output", "listify", "which",
            "ConfigBuilder", "multi_glob", "get_spawn", "quoted",
-           "get_pip_install_location")
+           "get_pip_install_location", "compiler_flag_list")
 
 if TYPE_CHECKING:
     from typing import Iterable, TypeVar, Union, List, Dict, Tuple, Optional, \
@@ -1092,6 +1092,27 @@ def add_RegressionTest(env: "SCEnvironment") -> None:
     )
 
 
+def compiler_flag_list(
+        flags: "Union[str, Iterable]",
+        excludes: "Optional[Iterable]" = []
+    ) -> "List[str]":
+    """
+    Separate concatenated compiler flags in ``flags``.
+    Entries listed in ``excludes`` are omitted.
+    """
+    if not isinstance(flags, str):
+        flags = " ".join(flags)
+    # split concatenated entries
+    flags = f" {flags}".split(" -")[1:]
+    flags = [f"-{flag}" for flag in flags]
+    cc_flags = []
+    excludes = tuple(excludes)
+    for flag in flags:
+        if not flag.startswith(excludes) and flag not in cc_flags:
+            cc_flags.append(flag)
+    return cc_flags
+
+
 def quoted(s: str) -> str:
     """Return the given string wrapped in double quotes."""
     return f'"{s}"'