Combining C and C++ libraries

I'm a novice with STM32 and Keil.  I'd like to use a BMP280 C library and a RFM69 C++ library.  I wasn't able to understand how to use both in the same project.  Can someone share some advice/guidance?  The C++ library uses .hpp files and they were not recognized.  I was probably making a mistake.  Thank you in advance for any help.

Frank

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