The /usr/lib/64/R/include/R_ext/Print.h makes the assumption that
__SUNPRO_CC == stlport which is incorrect in the way we deliver R in
the version that's in Solaris.

This problem has been reported upstream at:
https://bugs.r-project.org/bugzilla/show_bug.cgi?id=16767

--- R-3.2.3/src/include/R_ext/Print.h.orig	2016-03-16 06:31:42.210416076 -0700
+++ R-3.2.3/src/include/R_ext/Print.h	2016-03-16 06:52:39.625133958 -0700
@@ -27,7 +27,7 @@
    defined in namespace std. */
 # ifdef R_USE_C99_IN_CXX
 #  include <cstdarg>
-#  ifdef __SUNPRO_CC
+#  if defined(__SUNPRO_CC) && defined(_STLP_VENDOR_CSTD)
 using _STLP_VENDOR_CSTD::va_list;
 #  endif
 # endif