make sure it finds zlib headers

cvsps/cvsps.spec

@@ -33,7 +33,7 @@ Distribution: OpenPKG [EVAL]
 Group:        SCM
 License:      GPL
 Version:      2.0rc1
-Release:      20030630
+Release:      20030702
 
 #   list of sources
 Source0:      http://www.cobite.com/cvsps/cvsps-%{version}.tar.gz
@@ -62,7 +62,7 @@ AutoReqProv:  no
 
 %build
     %{l_make} %{l_mflags -O} \
-        CC="%{l_cc}" LDFLAGS="%{l_ldflags}"
+        CC="%{l_cc} %{l_cppflags}" LDFLAGS="%{l_ldflags}"
 
 %install
     rm -rf $RPM_BUILD_ROOT