--- rpm-5.4.10/macros/macros.rpmbuild.in.old	2012-09-15 19:31:55.178325519 +0200
+++ rpm-5.4.10/macros/macros.rpmbuild.in	2012-09-15 19:32:37.158324039 +0200
@@ -324,8 +324,18 @@
 %___build_args		-e
 %___build_cmd		%{?_sudo:%{_sudo} }%{?_remsh:%{_remsh} %{_remhost} }%{?_remsudo:%{_remsudo} }%{?_remchroot:%{_remchroot} %{_remroot} }%{___build_shell} %{___build_args}
 %___build_pre	\
+  RPM_SOURCE_DIR=\"%{u2p:%{_sourcedir}}\"\
+  RPM_BUILD_DIR=\"%{u2p:%{_builddir}}\"\
   RPM_OPT_FLAGS=\"%{optflags}\"\
-  export RPM_OPT_FLAGS\
+  RPM_ARCH=\"%{_arch}\"\
+  RPM_OS=\"%{_os}\"\
+  export RPM_SOURCE_DIR RPM_BUILD_DIR RPM_OPT_FLAGS RPM_ARCH RPM_OS\
+  RPM_DOC_DIR=\"%{_docdir}\"\
+  export RPM_DOC_DIR\
+  RPM_PACKAGE_NAME=\"%{name}\"\
+  RPM_PACKAGE_VERSION=\"%{version}\"\
+  RPM_PACKAGE_RELEASE=\"%{release}\"\
+  export RPM_PACKAGE_NAME RPM_PACKAGE_VERSION RPM_PACKAGE_RELEASE\
   %{?buildroot:RPM_BUILD_ROOT=\"%{u2p:%{buildroot}}\"\
   export RPM_BUILD_ROOT}\
   %{?_javaclasspath:CLASSPATH=\"%{_javaclasspath}\"\