do not try to set user or group id when installing
--- proftpd-1.3.2b.orig/Make.rules.in	2008-11-19 04:51:38.000000000 +0100
+++ proftpd-1.3.2b/Make.rules.in	2010-01-20 17:52:24.864178426 +0100
@@ -29,9 +29,9 @@ UTILS_LIBS=@UTILS_LIBS@ @LIBS@
 INSTALL=@INSTALL@
 INSTALL_USER=@install_user@
 INSTALL_GROUP=@install_group@
-INSTALL_BIN=$(INSTALL) @INSTALL_STRIP@ -o $(INSTALL_USER) -g $(INSTALL_GROUP) -m 0755
-INSTALL_SBIN=$(INSTALL) @INSTALL_STRIP@ -o $(INSTALL_USER) -g $(INSTALL_GROUP) -m 0755
-INSTALL_MAN=$(INSTALL) -o $(INSTALL_USER) -g $(INSTALL_GROUP) -m 0644
+INSTALL_BIN=$(INSTALL) @INSTALL_STRIP@ -m 0755
+INSTALL_SBIN=$(INSTALL) @INSTALL_STRIP@ -m 0755
+INSTALL_MAN=$(INSTALL) -m 0644
 
 RM=rm -f
 SHELL=/bin/sh