[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
 Keywords:  Leopard    |       Port:  guile
-----------------------+-------------------
 {{{
 checking dependency style of /usr/bin/gcc-4.2... gcc3
 checking how to enable C11 support... -std=gnu11
 checking how to run the C preprocessor... /lib/cpp
 configure: error: in
 `/opt/local/var/macports/build/_opt_local_var_macports_sources_nue.de.rsync.macports.org_macports_release_tarballs_ports_lang_guile/guile/work/guile-2.2.2':
 configure: error: C preprocessor "/lib/cpp" fails sanity check
 See `config.log' for more details
 Command failed:  cd
 "/opt/local/var/macports/build/_opt_local_var_macports_sources_nue.de.rsync.macports.org_macports_release_tarballs_ports_lang_guile/guile/work/guile-2.2.2"
 && ./configure --prefix=/opt/local CPPFLAGS="-I/opt/local/include"
 LDFLAGS="-L/opt/local/lib" --infodir="/opt/local/share/info"
 --mandir="/opt/local/share/man" --enable-regex --disable-error-on-warning
 --disable-silent-rules --host=powerpc-apple-darwin9 --build=powerpc-apple-
 darwin9
 Exit code: 1
 Error: Failed to configure guile, consult
 /opt/local/var/macports/build/_opt_local_var_macports_sources_nue.de.rsync.macports.org_macports_release_tarballs_ports_lang_guile/guile/work/guile-2.2.2/config.log
 Error: Failed to configure guile: configure failure: command execution
 failed
 DEBUG: Error code: NONE
 DEBUG: Backtrace: configure failure: command execution failed
 }}}

 In `config.log` one can find:

 {{{
 configure:6228: /lib/cpp -I/opt/local/include conftest.c
 ./configure: line 3037: /lib/cpp: No such file or directory
 }}}

 `configure` knows this `influential environment variable`:

 {{{
   CPP         C preprocessor
 }}}

 This can be fixed in Portfile, see attached patch file.

--
Ticket URL: <https://trac.macports.org/ticket/54124>
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