diff --git a/src/SPC/builder/traits/UnixLibraryTrait.php b/src/SPC/builder/traits/UnixLibraryTrait.php
index 8e69f6d3..f302bbfa 100644
--- a/src/SPC/builder/traits/UnixLibraryTrait.php
+++ b/src/SPC/builder/traits/UnixLibraryTrait.php
@@ -118,4 +118,13 @@ trait UnixLibraryTrait
     {
         return getenv($this->getSnakeCaseName() . '_LIBS') ?: '';
     }
+
+    public function getLibExtraCXXFlags(): string
+    {
+        $env = getenv($this->getSnakeCaseName() . '_CXXFLAGS') ?: '';
+        if (!str_contains($env, $this->builder->arch_cxx_flags)) {
+            $env .= $this->builder->arch_cxx_flags;
+        }
+        return $env;
+    }
 }
diff --git a/src/SPC/util/UnixShell.php b/src/SPC/util/UnixShell.php
index 957d66a6..be80cb4c 100644
--- a/src/SPC/util/UnixShell.php
+++ b/src/SPC/util/UnixShell.php
@@ -70,6 +70,7 @@ class UnixShell
             'CFLAGS' => $library->getLibExtraCFlags(),
             'LDFLAGS' => $library->getLibExtraLdFlags(),
             'LIBS' => $library->getLibExtraLibs(),
+            'CXXFLAGS' => $library->getLibExtraCXXFlags(),
         ]);
         return $this;
     }