Compile error related to a pdfium header

[Ashfaaq18]

I tried compiling this project with my own makefile and got most of the cpps compiled except for one, This cpp produces the following errors

//------------------------------------ERRORS------------------------------------------//
g++ -g -Wall -I"C:\DevLibs\wxWidgets\include\wx-3.1" -I"C:\DevLibs\wxWidgets\lib\wx\include\msw-unicode-static-3.1" -I"Include" -I"C:\DevLibs\pdfium-windows-x64-v8\include" -c -o obj/PDFViewImpl.o src/PDFViewImpl.cpp
In file included from C:\DevLibs\pdfium-windows-x64-v8\include/fpdf_dataavail.h:13,
from Include/private/PDFViewImpl.h:20,
from src/PDFViewImpl.cpp:10:
C:\DevLibs\pdfium-windows-x64-v8\include/fpdfview.h:803:32: error: variable or field 'FPDF_RenderPage' declared void
803 | FPDF_EXPORT void FPDF_CALLCONV FPDF_RenderPage(HDC dc,
| ^~~~~~~~~~~~~~~
C:\DevLibs\pdfium-windows-x64-v8\include/fpdfview.h:803:48: error: 'HDC' was not declared in this scope
803 | FPDF_EXPORT void FPDF_CALLCONV FPDF_RenderPage(HDC dc,
| ^~~
C:\DevLibs\pdfium-windows-x64-v8\include/fpdfview.h:804:58: error: expected primary-expression before 'page'
804 | FPDF_PAGE page,
| ^~~~
C:\DevLibs\pdfium-windows-x64-v8\include/fpdfview.h:805:48: error: expected primary-expression before 'int'
805 | int start_x,
| ^~~
C:\DevLibs\pdfium-windows-x64-v8\include/fpdfview.h:806:48: error: expected primary-expression before 'int'
806 | int start_y,
| ^~~
C:\DevLibs\pdfium-windows-x64-v8\include/fpdfview.h:807:48: error: expected primary-expression before 'int'
807 | int size_x,
| ^~~
C:\DevLibs\pdfium-windows-x64-v8\include/fpdfview.h:808:48: error: expected primary-expression before 'int'
808 | int size_y,
| ^~~
C:\DevLibs\pdfium-windows-x64-v8\include/fpdfview.h:809:48: error: expected primary-expression before 'int'
809 | int rotate,
| ^~~
C:\DevLibs\pdfium-windows-x64-v8\include/fpdfview.h:810:48: error: expected primary-expression before 'int'
810 | int flags);
| ^~~
mingw32-make: *** [Makefile:48: obj/PDFViewImpl.o] Error 1
//------------------------------------ERRORS------------------------------------------//

The errors are under the pdfium header fpdfview.h. The pdfium binaries I used are the chromium/4194 version from the pdfium binaries you've linked. Any idea on what to do? happy to give more info on request