Building gLExec from src rpm gLite era

How to build gLExec from a .src.rpm

• Platform: Centos-4

• Installed extra packages

vdt_globus_essentials-VDT1.6.0x86_rhas_4-1
org.glite.build.common-cpp-3.2.1-2
glite-security-voms-api-c-1.8.12-1.slc4
glite-security-voms-api-cpp-1.8.12-1
glite-security-lcas-interface-1.3.6-3.slc4
[http://eticssoft.web.cern.ch/eticssoft/repository/org.glite/org.glite.security.lcas/1.3.7/slc4_ia32_gcc346/glite-security-lcas-1.3.7-2.slc4.i386.rpm
glite-security-lcas-1.3.7-2.slc4]
glite-security-lcmaps-1.4.3-4.slc4