This package is interesting to package developers only, and provides a compiled HTSlib for developers to use in their own packages. See the vignette for instructions on use.
pkgconfig
(Package: Rhtslib) :
Compiler configuration arguments for use of Rhtslib
This function returns values for PKG_LIBS and PKG_CPPFLAGS variables for use in Makevars files. See vignette("Rhtslib", "Rhtslib") for details. Only PKG_LIBS should be needed in most cases.
providing 
.