diff --git a/devel/rcs/Portfile b/devel/rcs/Portfile
index 7a32ca0fc55f8..e04cbd0e7bd21 100644
--- a/devel/rcs/Portfile
+++ b/devel/rcs/Portfile
@@ -29,6 +29,11 @@ checksums           rmd160  0adde8a075de346e4229a893366e2aa396b4e651 \
                     sha256  43ddfe10724a8b85e2468f6403b6000737186f01e60e0bd62fde69d842234cc5 \
                     size    917331
 
+if {${os.platform} eq "darwin" && ${os.major} > 22} {
+    configure.cflags-append \
+                    -Wno-error=incompatible-function-pointer-types
+}
+
 set docdir          ${prefix}/share/doc/${name}
 
 post-destroot {