fix installation under platforms where no system install(1) command exists

arj/arj.spec

@@ -34,7 +34,7 @@ Class:        EVAL
 Group:        Archiver
 License:      Open Source
 Version:      3.10.21
-Release:      20050124
+Release:      20050217
 
 #   list of sources
 Source0:      http://testcase.newmail.ru/files/arj-%{version}.tar.gz
@@ -69,6 +69,7 @@ AutoReqProv:  no
       CFLAGS="%{l_cflags -O}" \
       CPPFLAGS="%{l_cppflags}" \
       LDFLAGS="%{l_ldflags}" \
+      INSTALL="%{l_shtool} install -c" \
       ./configure \
           --prefix=%{l_prefix}
     ) || exit $?