--- Makefile.PL.orig	2023-03-20 17:43:14.000000000 +0100
+++ Makefile.PL	2023-03-20 17:43:24.000000000 +0100
@@ -120,7 +120,7 @@
     close H_IN;
     open (H, "<", $curl_h) or die ("Cannot open $curl_h: ".$!);
     while(<H>) {
-        if (/^#define (CURL[A-Za-z0-9_]*)/) {
+        if (/^#define (CURL[A-Za-z0-9_]*)[[:blank:]]/) {
             push @syms, $1;
         }
     }