c - linker can't find libraries -

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i can't link program "set-manipulation" libraries needs.

here message: 

gcc -l/home/jenia/learn-c-the-hard-way/lib -lset_theory -g -wall -i/home/jenia/learn-c-the-hard-way/lib/include -o "set-manipulation" main.o /usr/bin/ld: cannot find -lset_theory collect2: error: ld returned 1 exit status makefile:9: recipe target 'set-manipulation' failed make: *** [set-manipulation] error 1

here content of -l/home/jenia/learn-c-the-hard-way/lib: 

  /home/jenia/learn-c-the-hard-way/lib:   total used in directory 29 available 216513716   drwxr-xr-x  3 jenia jenia 4096 nov  1 12:47 .   drwxr-xr-x  8 jenia jenia 4096 oct 31 11:44 ..   drwxr-xr-x  2 jenia jenia 4096 nov  1 12:47 include   -rwxr-xr-x  1 jenia jenia 6804 nov  1 12:47 set_theory.a -- 50   -rwxr-xr-x  1 jenia jenia 9664 nov  1 12:47 set_theory.so -- 11

here makefile give error (the makefile of set-manipulation program):

prefix?=/home/jenia/learn-c-the-hard-way cflags=-g -wall -i${prefix}/lib/include ldflags=-l${prefix}/lib install_dir=${prefix}/apps  all: set-manipulation  set-manipulation: main.o     gcc $(ldflags) -lset_theory $(cflags) -o "$@" main.o   install:     install -d $(install_dir)/set-manipulation     install set-manipulation $(install_dir)/set-manipulation  clean:     rm -f *.o     rm -f set-manipulation     rm -rf *.dsym

can please tell me how link program it's library?

-l../../patch_to_library.a/set_theory.a

the library must named libname.a/.so

example : g++ set.cpp -l../../libset_theory.a -lset_theory

if don't have named library libname.a dont't link lib.

libtest.a

an corect link syntax :

g++ (link) -ltest

you see ? -l test don't include lib. l - lib

g++ -g -wall -l/lib_dir/xx foo.o test.o -lset_theory -o test

name of lib must libset_theory.a


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