Corrected version and naming problems with additional variables, as Ralf suggested.

infozip/infozip.spec

@@ -23,6 +23,11 @@
 ##  SUCH DAMAGE.
 ##
 
+%define       V_zip_here   2.3
+%define       V_zip_real   23
+%define       V_unzip_here 5.50
+%define       V_unzip_real 550
+
 #   package information
 Name:         infozip
 Summary:      Un-/Packing Tools for [PK]ZIP Files
@@ -32,12 +37,12 @@ Packager:     The OpenPKG Project
 Distribution: OpenPKG [REL]
 Group:        Archiver
 License:      BSD
-Version:      2.3
-Release:      20020315
+Version:      20020419
+Release:      20020419
 
 #   list of sources
-Source0:      ftp://ftp.info-zip.org/pub/infozip/src/zip23.tar.gz
-Source1:      ftp://ftp.info-zip.org/pub/infozip/src/unzip550.tar.gz
+Source0:      ftp://ftp.info-zip.org/pub/infozip/src/zip%{V_zip_real}.tar.gz
+Source1:      ftp://ftp.info-zip.org/pub/infozip/src/unzip%{V_unzip_real}.tar.gz
 
 #   build information
 Prefix:       %{l_prefix}
@@ -57,10 +62,10 @@ AutoReqProv:  no
     %setup1 -q -T -D -a 1
 
 %build
-    ( cd zip-2.3
+    ( cd zip-%{V_zip_here}
       %{l_make} %{l_mflags} -f unix/Makefile generic
     )
-    ( cd unzip-5.42
+    ( cd unzip-%{V_unzip_here}
       os=generic
       case "%{l_target}" in
           *-linux*   ) os=linux_noasm ;;
@@ -73,12 +78,12 @@ AutoReqProv:  no
 %install
     rm -rf $RPM_BUILD_ROOT
     %{l_shtool} mkdir -f -p -m 755 $RPM_BUILD_ROOT%{l_prefix}
-    ( cd zip-2.3
+    ( cd zip-%{V_zip_here}
       %{l_make} %{l_mflags} -f unix/Makefile install \
           prefix=$RPM_BUILD_ROOT%{l_prefix} \
           INSTALL_D="%{l_shtool} mkdir -f -p -m 755"
     )
-    ( cd unzip-5.42
+    ( cd unzip-%{V_unzip_here}
       %{l_make} %{l_mflags} -f unix/Makefile install \
           prefix=$RPM_BUILD_ROOT%{l_prefix} \
           INSTALL_D="%{l_shtool} mkdir -f -p -m 755"