lang/g95 fails on Mac OS X 10.10.5

[Hubert Feyrer <hubert%feyrer.de@localhost>]

unfortunately this blocks out more packages like math/R.
Any ideas how to fix?


 - Hubert


clang    -DIN_GCC   -W -Wall -Wwrite-strings -Wstrict-prototypes 
-Wmissing-prototypes -pedantic -Wno-long-long -Wno-variadic-macros 
-Wold-style-definition -Wmissing-format-attribute    -DHAVE_CONFIG_H  -o 
cc1-dummy c-lang.o stub-objc.o attribs.o c-errors.o c-lex.o c-pragma.o 
c-decl.o c-typeck.o c-convert.o c-aux-info.o c-common.o c-opts.o 
c-format.o c-semantics.o c-incpath.o cppdefault.o c-ppoutput.o 
c-cppbuiltin.o prefix.o c-objc-common.o c-dump.o c-pch.o c-parser.o 
darwin-c.o c-gimplify.o tree-mudflap.o c-pretty-print.o dummy-checksum.o \
          main.o  libbackend.a ../libcpp/libcpp.a ../libcpp/libcpp.a 
./../intl/libintl.a -liconv  ../libiberty/libiberty.a
Undefined symbols for architecture x86_64:
  "_host_hooks", referenced from:
      _c_common_no_more_pch in c-pch.o
      _general_init in libbackend.a(toplev.o)
      _gt_pch_save in libbackend.a(ggc-common.o)
      _gt_pch_restore in libbackend.a(ggc-common.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see 
invocation)
gnumake[2]: *** [cc1-dummy] Error 1
gnumake[1]: *** [all-gcc] Error 2
gnumake: *** [all] Error 2
*** Error code 2

Stop.
bmake[3]: stopped in /usr/pkgsrc/lang/g95
*** Error code 1