--- rpm-4.8.0/build/files.c.special-doc-dir	2016-01-13 16:30:19.998551710 +0100
+++ rpm-4.8.0/build/files.c	2016-01-13 16:53:35.160204917 +0100
@@ -1928,6 +1928,30 @@ static rpmRC processPackageFiles(rpmSpec
 	    int _missing_doc_files_terminate_build =
 		    rpmExpandNumeric("%{?_missing_doc_files_terminate_build}");
 	    rpmRC rc;
+	    char *sDoc;
+	    int i, sDocLen;
+
+	    sDoc = rpmGenPath(fl.buildRoot, NULL, pkg->specialDocDir);
+	    sDocLen = strlen(sDoc);
+
+	    /* Check if specialDocDir is empty */
+	    for (i = 0; i < fl.fileListRecsUsed; i++) {
+		char *diskPath = fl.fileList[i].diskPath;
+
+		/* Just to be sure */
+		if (!diskPath)
+		    continue;
+
+		if (strlen(diskPath) > sDocLen &&
+		    rstreqn(diskPath, sDoc, sDocLen)) {
+
+		    /* Warn if specialDocDir is not empty */
+		    rpmlog(RPMLOG_WARNING, _("filelist: Can't mix \"%%doc\" "
+		    "with relative path and files with absolute path "
+		    "starting with: \"%s\"\n"), pkg->specialDocDir);
+		    break;
+		}
+	    }
 
 	    rc = doScript(spec, RPMBUILD_STRINGBUF, "%doc", pkg->specialDoc, test);
 	    if (rc != RPMRC_OK && _missing_doc_files_terminate_build)