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I'm trying to install the devtools package for R (v3.6.1) with install.package("devtools"). The install fails when openssl cannot be found, although openssl version -a indicates that LibreSSL 2.8.3 is installed. The OS is macOS 10.15.1.

Here is the console log:

* installing *source* package ‘openssl’ ... ** package ‘openssl’ successfully unpacked and MD5 sums checked ** using staged installation Homebrew 2.2.0 Homebrew/homebrew-core (git revision 434f; last commit 2019-12-03) Homebrew/homebrew-cask (git revision deedf; last commit 2019-12-03) Using PKG_CFLAGS=-I/usr/local/opt/[email protected]/include -I/usr/local/opt/openssl/include ------------------------- ANTICONF ERROR --------------------------- Configuration failed because openssl was not found. Try installing: * deb: libssl-dev (Debian, Ubuntu, etc) * rpm: openssl-devel (Fedora, CentOS, RHEL) * csw: libssl_dev (Solaris) * brew: [email protected] (Mac OSX) If openssl is already installed, check that 'pkg-config' is in your PATH and PKG_CONFIG_PATH contains a openssl.pc file. If pkg-config is unavailable you can set INCLUDE_DIR and LIB_DIR manually via: R CMD INSTALL --configure-vars='INCLUDE_DIR=... LIB_DIR=...' -------------------------------------------------------------------- ERROR: configuration failed for package ‘openssl’ * removing ‘/usr/local/lib/R/3.6/site-library/openssl’ Warning in install.packages : installation of package ‘openssl’ had non-zero exit status

How do I exactly do that PATH stuff the error message suggests? Or is there any other remedy you could suggest? Both the r and macOS installations are fresh, so there shouldn't be anything out of the ordinary messing this up.

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    As LibreSSL is a fork of OpenSSL, I presume they are different enough to not be recognized by devtools package as Openssl. You should try to install [email protected] as suggested by the console log. Commented Dec 4, 2019 at 13:40
  • This solves the problem, thank you very much! I didn't initially want to try this over concerns that the native ssl would get replaced. However, brew install openssl left the original intact and devtools installation finished successfully. @dc37 if you wanna write up an answer, I'll make sure to accept it. Commented Dec 4, 2019 at 15:53
  • Glad that you get it worked. Commented Dec 4, 2019 at 15:55

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As LibreSSL is a fork of OpenSSL, I presume they are different enough to not be recognized by devtools package as Openssl. You should try to install [email protected] as suggested by the console log.

brew install openssl
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