diff -Nurd nut-2.8.0.orig/m4/nut_compiler_family.m4 nut-2.8.0/m4/nut_compiler_family.m4
--- nut-2.8.0.orig/m4/nut_compiler_family.m4	2022-04-23 07:56:07.000000000 -0400
+++ nut-2.8.0/m4/nut_compiler_family.m4	2023-03-26 03:48:01.000000000 -0400
@@ -144,25 +144,6 @@
 dnl    AS_IF([test "x$GCC" = xyes], [CFLAGS="$CFLAGS -Wno-unknown-warning"])
 dnl    AS_IF([test "x$GXX" = xyes], [CXXFLAGS="$CXXFLAGS -Wno-unknown-warning"])
 
-dnl # There should be no need to include standard system paths (and possibly
-dnl # confuse the compiler assumptions - along with its provided headers)...
-dnl # ideally; in practice however cppunit, net-snmp and some system include
-dnl # files do cause grief to picky compiler settings (more so from third
-dnl # party packages shipped via /usr/local/... namespace):
-    AS_IF([test "x$CLANGCC" = xyes -o "x$GCC" = xyes], [
-dnl #        CFLAGS="-isystem /usr/include $CFLAGS"
-        AS_IF([test -d /usr/local/include],
-            [CFLAGS="-isystem /usr/local/include $CFLAGS"])
-        AS_IF([test -d /usr/pkg/include],
-            [CFLAGS="-isystem /usr/pkg/include $CFLAGS"])
-    ])
-    AS_IF([test "x$CLANGXX" = xyes -o "x$GXX" = xyes], [
-dnl #        CXXFLAGS="-isystem /usr/include $CXXFLAGS"
-        AS_IF([test -d /usr/local/include],
-            [CXXFLAGS="-isystem /usr/local/include $CXXFLAGS"])
-        AS_IF([test -d /usr/pkg/include],
-            [CXXFLAGS="-isystem /usr/pkg/include $CXXFLAGS"])
-    ])
 
 dnl # Default to avoid noisy warnings on older compilers
 dnl # (gcc-4.x, clang-3.x) due to their preference of