kumofs : build with our own gcc, because it cannot be built with GCC 6.

component/kumo/buildout.cfg

 [buildout]
 extends =
+  ../gcc/buildout.cfg
   ../tokyocabinet/buildout.cfg
   ../messagepack/buildout.cfg
   ../openssl/buildout.cfg
@@ -24,5 +25,6 @@ configure-options =
 
 environment =
   CPPFLAGS=-I${zlib:location}/include -I${openssl:location}/include
-  LDFLAGS=-L${zlib:location}/lib -L${openssl:location}/lib -Wl,-rpath=${tokyocabinet:location}/lib -Wl,-rpath=${messagepack:location}/lib -Wl,-rpath=${zlib:location}/lib -Wl,-rpath=${openssl:location}/lib
-  PATH=${patch:location}/bin:%(PATH)s
+  LD_LIBRARY_PATH=${gcc-fortran:location}/lib:${gcc-fortran:location}/lib64
+  LDFLAGS=-Wl,-rpath=${gcc-fortran:location}/lib -Wl,-rpath=${gcc-fortran:location}/lib64 -L${zlib:location}/lib -L${openssl:location}/lib -Wl,-rpath=${tokyocabinet:location}/lib -Wl,-rpath=${messagepack:location}/lib -Wl,-rpath=${zlib:location}/lib -Wl,-rpath=${openssl:location}/lib
+  PATH=${gcc-fortran:location}/bin:${patch:location}/bin:%(PATH)s