undefined reference to `MAIN__'

[chao sun]

Dear friends
I compiled the Prep_sources_chem_cptec_wrf with the gfortran 4.4.0 and
encountered some error.

After I seted up the Fortran/C compilers and conducted ‘make’ the
error message as follows came out::

gfortran -o prep_chem_sources  \
    prep_chem_sources.a ..//utils/bin/libutils-2.0-opt.a
-I/usr/local/include -L/usr/local/lib -lnetcdf
/usr/lib/gcc/i586-redhat-linux/4.4.0/libgfortranbegin.a(fmain.o): In
function `main':
(.text+0x27): undefined reference to `MAIN__'
collect2: ld returned 1 exit status
make: *** [prep_chem_sources] Error 1



I seted up the gfortran as follows:
F_COMP=gfortran
C_COMP=gcc
LOADER=gfortran
C_LOADER=gcc
LIBS=-L/usr/local/lib -L/usr/lib -L/usr/lib/gcc/i586-redhat-linux/3.4.6
MOD_EXT=mod
# Compiler options
F_OPTS=-fconvert=big-endian -ffree-form $(NCDF_LIBS) -g
C_OPTS=-O2 -DMAIN__=main_
LOADER_OPTS=
C_LOADER_OPTS=-v