try to fix building under Solaris and Darwin and remove an obsolete subst

popt/popt.spec

@@ -32,7 +32,7 @@ Class:        BASE
 Group:        Libraries
 License:      LGPL
 Version:      1.14
-Release:      20080406
+Release:      20080408
 
 #   list of sources
 Source0:      http://rpm5.org/files/popt/popt-%{version}.tar.gz
@@ -66,11 +66,8 @@ AutoReqProv:  no
     %patch -p0
 
 %build
-    %{l_shtool} subst \
-        -e 's;test ! -f \.\./rpm\.c;false;' \
-        configure
     CC="%{l_cc}" \
-    CPPFLAGS="-DOPENPKG" \
+    CPPFLAGS="-DOPENPKG -DPOPT_fprintf=fprintf" \
     CFLAGS="%{l_cflags -O}" \
     GREP="grep" \
     ./configure \