ghostscript install problem

[Fred]

Hello,

I am trying to install ghostscript8 from ports on 8.0-RELEASE-p4.  The
build stops when
/usr/ports/print/ghostscript8/work/ghostscript-8.64/epag-3.09/ert is to
be installed in /usr/local/bin.  The error is file not found.  Error
code 71.  I tried going to the epag-3.09 directory:
make clean
make
The following warnings are produced:
ert.c:  In function 'printUsageAndExit':
ert.c:34: warning: incompatible implicit declaration of built-in
function 'exit'
ert.c: In function 'main':
ert.c:52: warning: incompatible implicit declaration of built-in function
'malloc'
ert.c:55: warning: incompatible implicit declaration of built-in function
'exit'
ert.c:63: warning: incompatible implicit declaration of built-in function
'strlen'
ert.c:73: warning: incompatible implicit declaration of built-in function
'exit'
ert.c:82: warning: incompatible implicit declaration of built-in function
'exit'
ert.c:87: warning: incompatible implicit declaration of built-in function
'exit'
ert.c:116: warning: incompatible implicit declaration of built-in function
'exit'

What can I do to resolve this problem?

Best regards,
Fred