Hi everyone, I am using R-3.6.0 on CentOS 7.7. I got the following error message when I typed ?curl::curl_download(url,tempfile())?: Error in new_handle() : An unknown option was passed in to libcurl Because of this error, I cannot use devtools::install_github. The version of curl is the one that comes with CentOS 7.7: curl 7.29.0. My R session info: R version 3.6.0 (2019-04-26) Platform: x86_64-pc-linux-gnu (64-bit) Running under: CentOS Linux 7 (Core) Matrix products: default BLAS: /home/opt/software/R-3.6.0/lib64/R/lib/libRblas.so LAPACK: /home/opt/software/R-3.6.0/lib64/R/lib/libRlapack.so locale: [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C [3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8 [5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 [7] LC_PAPER=en_US.UTF-8 LC_NAME=C [9] LC_ADDRESS=C LC_TELEPHONE=C [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C attached base packages: [1] stats graphics grDevices utils datasets methods base other attached packages: [1] curl_4.1 RCurl_1.95-4.12 bitops_1.0-6 loaded via a namespace (and not attached): [1] compiler_3.6.0 How can I deal with this error? Regards, Degang [[alternative HTML version deleted]]