namespace geno_eye
{
typedef int64_t PosType;
}

##</code><code>##

TYPEMAP
geno_eye::PosType    T_IV

##</code><code>##

....

MODULE = GenoEye		PACKAGE = GenoEye::Page

geno_eye::Page*
Page::new(format, file, width, height, genome_display_length)
    SV* format
    SV* file
    double width
    double height
    geno_eye::PosType genome_display_length
    CODE:

##</code><code>##

GenoEye.c:196:2: error: ‘geno_eye__PosType’ was not declared in this scope
  geno_eye__PosType genome_display_length = (geno_eye__PosType)SvIV(ST(5))