XS cannot properly handle typemap with namespace

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namespace geno_eye
{
typedef int64_t PosType;
}

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TYPEMAP
geno_eye::PosType    T_IV

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....

...
    double height
    geno_eye::PosType genome_display_length
    CODE:

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

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