"Invalid declaration of or reference to symbol ..." errors - fortran

Question

I want to compile a makefile containing the following command on ubuntu 32 bit machine.
g77 -Wall -c -x f77-cpp-input -Wall
But I have some problems I cannot resolve.
[gustep.f][1] : In subroutine `gustep':
gustep.f:21:
INCLUDE 'gcblocks.inc'
^
Unable to open INCLUDE file `[gcblocks.inc][2]' at (^)
gustep.f:122:
CUTNEU = 1.0e-8
^
Invalid declaration of or reference to symbol `cutneu' at (^) [initially seen at (^)]
gustep.f:123:
IHADR = 5
^
Invalid declaration of or reference to symbol `ihadr' at (^) [initially seen at (^)]
gustep.f:125:
IF(NGKINE.GT.0) CALL GSKING(0)
^
Invalid declaration of or reference to symbol `ngkine' at (^) [initially seen at (^)]
gustep.f:129:
IF(GKIN(5,I).EQ.13) THEN
^
Invalid declaration of or reference to symbol `gkin' at (^) [initially seen at (^)]
gustep.f:140:
IF(INWVOL.EQ.1) THEN
^
Invalid declaration of or reference to symbol `inwvol' at (^) [initially seen at (^)]
gustep.f:141:
CALL GMEDIA(VECT,NUMED)
^
Invalid declaration of or reference to symbol `vect' at (^) [initially seen at (^)]
gustep.f:141:
CALL GMEDIA(VECT,NUMED)
^
Invalid declaration of or reference to symbol `numed' at (^) [initially seen at (^)]
gustep.f:144:
CALL UHTOC(NAMES(NLEVEL),4,NAME,4)
^
Invalid declaration of or reference to symbol `names' at (^) [initially seen at (^)]
gustep.f:144:
CALL UHTOC(NAMES(NLEVEL),4,NAME,4)
^
Invalid declaration of or reference to symbol `nlevel' at (^) [initially seen at (^)]
gustep.f:152:
IF(ITRA.EQ.TRAK_P) THEN
^
Invalid declaration of or reference to symbol `itra' at (^) [initially seen at (^)]
gustep.f:173:
COPY_NO = NUMBER(NLEVEL-2)
^
Invalid declaration of or reference to symbol `number' at (^) [initially seen at (^)]
gustep.f:177:
DE_P_DEL(M) = DE_P_DEL(M)+DESTEP*1000.
^
Invalid declaration of or reference to symbol `destep' at (^) [initially seen at (^)]
In file included from gustep.f:0:
Why this declaration is invalid? And how to solve the problem? May
someone explain it?

Answer 1

It's just what the compiler tells you:
Unable to open INCLUDE file `[gcblocks.inc][2]'
It can't find the file gcblocks.inc. The other errors are about missing variable declarations. Probably, these are declared in the missing file. Is gcblocks.inc in the current directory? If not, you will need to specify its directory with -I/path/to/include/dir/.