[MacPorts] #54124: guile @2.2.2 won't build on PPC Leopard, Mac OS X 10.5.8, because is uses non-existing /lib/cpp as C preprocessor

[MacPorts]

#54124: guile @2.2.2 won't build on PPC Leopard, Mac OS X 10.5.8, because is uses
non-existing /lib/cpp as C preprocessor
------------------------+---------------------------------------
  Reporter:  ballapete  |      Owner:
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.1
Resolution:             |   Keywords:  tiger leopard snowleopard
      Port:  guile      |
------------------------+---------------------------------------

Comment (by ballapete):

 Replying to [comment:3 ryandesign]:
 > That reason appears to be that this build system is trying to make
 Apple's gcc 4.2.1 use C11, which it does not support. If this build system
 requires C11 support, old compilers will have to be blacklisted.

 Indeed! From `config.log` (on Snow Leopard):

 {{{
 configure:6180: checking how to enable C11 support
 configure:6183: result: -std=gnu11
 configure:6197: checking how to run the C preprocessor
 configure:6228: /usr/bin/llvm-gcc-4.2 -std=gnu11 -E -I/opt/local/include
 conftest.c
 cc1: error: unrecognized command line option "-std=gnu11"
 configure:6228: $? = 1
 configure: failed program was:
 | /* confdefs.h */
 | #define PACKAGE_NAME "GNU Guile"
 | #define PACKAGE_TARNAME "guile"
 | #define PACKAGE_VERSION "2.2.2"
 | #define PACKAGE_STRING "GNU Guile 2.2.2"
 | #define PACKAGE_BUGREPORT "bug-guile at gnu.org"
 | #define PACKAGE_URL "http://www.gnu.org/software/guile/"
 | /* end confdefs.h.  */
 | #ifdef __STDC__
 | # include <limits.h>
 | #else
 | # include <assert.h>
 | #endif
 |                    Syntax error
 configure:6228: /usr/bin/llvm-gcc-4.2 -std=gnu11 -E -I/opt/local/include
 conftest.c
 cc1: error: unrecognized command line option "-std=gnu11"
 }}}

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Ticket URL: <https://trac.macports.org/ticket/54124#comment:4>
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