I did the steps : 1:install libunwind lib. (version is : libunwind-1.1) 2:install google-perftools (version is : gperftools-2.0) 3:download squid-3.2.5.tar.gz & extract , then configure , then modify /src/Makefile follow the article : # vi src/Makefile squid_LDADD = \ -L../lib \ -ltcmalloc_minimal \ \ .. data_DATA = \ mib.txt LDADD = -L../lib -lmiscutil -lpthread -lm -ltcmalloc_minimal i did not find the string " -L../lib \" . please help me , how to do that . thank u very much .