Makefile.am error(unused variables)!

[Cliff Tsai]

Hi:     I write a simple program and using autoconf,automake,but     have following automake problem.     my Makefile.am is         bin_PROGRAMS = test     test_SOURCES = main.c help.c help.h         but encounter a error->     Makefile.am:2 invalid unused variable name:test_SOURCES       Please tell me how to solve this problem,thanks!