--- build/parseSpec.c.orig	2025-01-07 09:55:58.006136886 +0000
+++ build/parseSpec.c	2025-01-07 09:56:23.618086661 +0000
@@ -1321,9 +1321,11 @@ static rpmSpec parseSpec(const char *spe
 	rpmPushMacroFlags(spec->macros, "_top_builddir", NULL,
 			top_builddir, RMIL_GLOBAL, RPMMACRO_LITERAL);
 
-	/* Undefine (!!) %_builddir so %global misuses fall through */
+	/* Undefine (!!) %_builddir and %buildroot so %global misuses fall through */
 	while (rpmMacroIsDefined(spec->macros, "_builddir"))
 	    rpmPopMacro(spec->macros, "_builddir");
+	while (rpmMacroIsDefined(spec->macros, "buildroot"))
+	    rpmPopMacro(spec->macros, "buildroot");
 	free(top_builddir);
     }