g77 errors

[Attila Horvath]

Can anyone offer some help with Fortran compilation...

Am trying to compile a very simple fortran program but I'm getting
compiler errors on every single line:

   'Invalid first character at (^) [info -f g77 M LEX]'

Does g77 invoke LEX? Is this something else I need in addition to the
standard gcc installed package?

If anyone can compile the file successfully, can you send me the exact
acommand line?

Thx in adavnce
Attila

PS: have attached the sample file


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-------------- next part --------------
PROGRAM JCB003
C
C Written by James Craig Burley 1997-02-23.
C
C Determine how compilers handle non-standard REAL
C and AIMAG on DOUBLE COMPLEX operands.
C

DOUBLE COMPLEX Z
REAL R
Z = (3.3D0, 4.4D0)
R = Z
CALL DUMDUM(Z, R)
R = REAL(Z) - R
IF (R .NE. 0.) PRINT *, ’REAL() is Fortran 90’
IF (R .EQ. 0.) PRINT *, ’REAL() is not Fortran 90’
R = 4.4D0
CALL DUMDUM(Z, R)
R = AIMAG(Z) - R
IF (R .NE. 0.) PRINT *, ’AIMAG() is Fortran 90’
IF (R .EQ. 0.) PRINT *, ’AIMAG() is not Fortran 90’
END

C
C Just to make sure compiler doesn’t use naive flow
C analysis to optimize away careful work above,
C which might invalidate results....
C
SUBROUTINE DUMDUM(Z, R)
DOUBLE COMPLEX Z
REAL R
END