Index: setup.py
--- setup.py.orig
+++ setup.py
@@ -107,7 +107,7 @@ class SABCToolsBuild(build_ext):
                 log.info("==> C++17 flag not available")
         else:
             # TODO: consider -flto - may require some extra testing
-            ldflags = ["-ldl"]  # for dlopen
+            ldflags = []  # for dlopen
             cflags = [
                 "-Wall",
                 "-Wextra",
@@ -115,7 +115,6 @@ class SABCToolsBuild(build_ext):
                 "-fomit-frame-pointer",
                 "-fno-rtti",
                 "-fno-exceptions",
-                "-O3",
                 "-fPIC",
                 "-fwrapv",
             ]
