Following warning message was received by me while installing XCMS
In fun(libname, pkgname) :
mzR has been built against a different Rcpp version (0.12.7)
than is installed on your system (0.12.8). This might lead to errors
when loading mzR. If you encounter such issues, please send a report,
including the output of sessionInfo() to the Bioc support forum at
https://support.bioconductor.org/. For details see also
Please help me to sort this out.