$NetBSD$

setresuid isn't supported on NetBSD.

--- configure.orig	2020-11-01 11:52:06.488906380 +0000
+++ configure
@@ -340,7 +340,9 @@ int main(void) {
 	setresuid(0, 0, 0);
 	return 0;
 }'
+if [ "$(uname)" != "NetBSD" ]; then
 check_func "setresuid" "$src" || die "system has no setresuid(2): not supported"
+fi
 
 #
 # Check for closefrom().
