switch to alternative BuildRoot approach in order to fix curl-config setup

curl/curl.spec

@@ -41,7 +41,7 @@ Source0:      http://curl.haxx.se/download/curl-%{version}.tar.bz2
 #   build information
 Prefix:       %{l_prefix}
 BuildRoot:    %{l_buildroot}
-BuildPreReq:  OpenPKG, openpkg >= 20020206, openssl
+BuildPreReq:  OpenPKG, openpkg >= 20020206, openssl, make
 PreReq:       OpenPKG, openpkg >= 20020206
 AutoReq:      no
 AutoReqProv:  no
@@ -64,14 +64,14 @@ AutoReqProv:  no
     LDFLAGS="-L%{l_prefix}/lib" \
     ./configure \
         --cache-file=config.cache \
-        --prefix=$RPM_BUILD_ROOT%{l_prefix} \
+        --prefix=%{l_prefix} \
         --with-ssl=%{l_prefix} \
         --disable-shared
     %{l_make} %{l_mflags -O}
 
 %install
     rm -rf $RPM_BUILD_ROOT
-    %{l_make} %{l_mflags} install
+    %{l_make} %{l_mflags} install AM_MAKEFLAGS="DESTDIR=$RPM_BUILD_ROOT"
     strip $RPM_BUILD_ROOT%{l_prefix}/bin/* >/dev/null 2>&1 || true
     %{l_rpmtool} files -v -ofiles -r$RPM_BUILD_ROOT %{l_files_std}