R: ensure correct gcc is picked when gcc used as a primary compiler

math/R/Portfile

@@ -48,14 +48,19 @@ compiler.blacklist-append   {macports-clang-1[7-9]}
 # Similarly, for gcc select the gcc13 variant of the compilers PG.
 # This setting should also be kept in sync with that in the R Portgroup.
 # Updates should be coordinated with the R maintainers.
-# NOTE: upon the update to gcc14, please add a blacklist of newer gccs,
+compiler.blacklist-append   {macports-gcc-1[4-9]}
+# NOTE: upon the update to gcc14, please update the blacklist accordingly,
 # like it is done for clangs. We would prefer using the same version of gcc and gfortran.
 if {${os.platform} eq "darwin" && ${os.major} < 10} {
     # Until old platforms are switched to the new libgcc.
     default_variants-append +gcc7
 } else {
     default_variants-append +gcc13
 }
+# When switching to gcc14, make sure to add this flag when gcc is used
+# as the primary compiler: -Wno-error=incompatible-pointer-types
+# devQuartz.c:3049:35: error: passing argument 2 of 'CGContextSetFont'
+# from incompatible pointer type [-Wincompatible-pointer-types]
 
 compilers.choose            fc f77
 compilers.setup             require_fortran