[MacPorts] #59345: R @3.5.1 configure failure

[MacPorts]

#59345: R @3.5.1 configure failure
---------------------+---------------------
 Reporter:  VBoudry  |      Owner:  (none)
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.6.1
 Keywords:           |       Port:  R 3.5.1
---------------------+---------------------
 Trying to install R ends-up in a configuration error:

 {{{
 configure:7937: /lib/cpp -I/opt/local/include
 -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk
 conftest.cpp
 ./configure: line 2412: /lib/cpp: No such file or directory
 configure:7937: $? = 127
 configure: failed program was:
 | /* confdefs.h */
 | #define PACKAGE_NAME "R"
 | #define PACKAGE_TARNAME "R"
 | #define PACKAGE_VERSION "3.5.1"
 | #define PACKAGE_STRING "R 3.5.1"
 | #define PACKAGE_BUGREPORT "https://bugs.r-project.org"
 | #define PACKAGE_URL "https://www.r-project.org"
 | #define PACKAGE "R"
 | #define VERSION "3.5.1"
 | #define R_PLATFORM "x86_64-apple-darwin18.7.0"
 | #define R_CPU "x86_64"
 | #define R_VENDOR "apple"
 | #define R_OS "darwin18.7.0"
 |
 }}}

 OSX 10.14.6 (18G95), Xcode Version 11.1 (11A1027)

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Ticket URL: <https://trac.macports.org/ticket/59345>
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