.TH CPPHEAD "" "" "Environmental Variable"
.PC "Append options to beginning of cpp command line"
\fBexport CPPHEAD=\fIoptions\fR
.PP
The \*(CO C preprocessor
.B cpp
reads the environmental variables
.B CPPHEAD
and
.B CPPTAIL
before it begins its work.
You can set these variables to hold the default options that you want the
preprocessor always to use.
.PP
.B cpp
appends the options in
.B CPPHEAD
to the beginning of its command line.
.SH "See Also"
.Xr "cpp," cpp
.Xr "CPPTAIL," cpptail
.Xr "environmental variables" environva
