QMake: filename with "_literal_", "_internal_" causes Extra Characters after expression.

[PolywickStudio]

Hi,
I am trying to compile Hyperscan.io using QMake.

$$PWD/src/rose/rosebuildadd_internal.h
will cause "Extra Characters after expression".

$$PWD/src/nfagraph/ng_literal_analysis.h
will cause "Extra Characters after expression".

You can get the repo here, specifically nfagraph:
https://github.com/intel/hyperscan/tree/master/src/nfagraph

adding files from nfagraph will cause QMake compile failure with "Extra Characters after expression". when adding filenames.

How do I solve this issue?

[jsulm]

@PolywickStudio You should ask nfagraph project.
Or at least post the content of the header files which cause this errors.