--- configure.ac.orig	2022-07-22 10:09:32.000000000 -0500
+++ configure.ac	2022-07-22 10:11:54.000000000 -0500
@@ -1052,13 +1052,13 @@
     then
       LDFLAGS="$LDFLAGS -L$HOME/ports/lib"
     fi
-    if test -d /opt/local/include
+    if test -d @PREFIX@/include
     then 
-      CPPFLAGS="$CPPFLAGS -I/opt/local/include"
+      CPPFLAGS="$CPPFLAGS -I@PREFIX@/include"
     fi
-    if test -d /opt/local/lib
+    if test -d @PREFIX@/lib
     then
-      LDFLAGS="$LDFLAGS -L/opt/local/lib"
+      LDFLAGS="$LDFLAGS -L@PREFIX@/lib"
     fi
 #   CPPFLAGS="$CPPFLAGS -mmacosx-version-min=10.13"
 #   CFLAGS="$CFLAGS -mmacosx-version-min=10.13"