error during 'make bootstrap' step of brew install gfortran

[gunshi]

Error:

==> Installing gfortran from ros/deps
==> Downloading http://ftpmirror.gnu.org/gcc/gcc-4.8.2/gcc-4.8.2.tar.bz2
Already downloaded: /Library/Caches/Homebrew/gfortran-4.8.2.tar.bz2
Warning: SHA1 support is deprecated and will be removed in a future version.
Please switch this formula to SHA256.
==> ../configure --prefix=/usr/local/Cellar/gfortran/4.8.2/gfortran --datarootdi
==> make bootstrap
Last 15 lines from /Users/gunshigupta/Library/Logs/Homebrew/gfortran/02.make:
c = isl_constraint_set_coefficient_si (c, isl_dim_out, time_depth, 1);
^
../../gcc/graphite-interchange.c:199:3: error: use of undeclared identifier 'c'
c = isl_constraint_set_coefficient_si (c, il_dim_out,

^
../../gcc/graphite-interchange.c:199:42: error: use of undeclared identifier 'c'
c = isl_constraint_set_coefficient_si (c, il_dim_out,
^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
make[3]: *** [graphite-interchange.o] Error 1
rm gcc.pod
make[2]: *** [all-stage1-gcc] Error 2
make[1]: *** [stage1-bubble] Error 2
make: *** [bootstrap] Error 2

READ THIS: https://git.io/brew-troubleshooting
If reporting this issue please do so at (not Homebrew/brew):
https://github.com/ros/homebrew-deps/issues

Thanks!

[daravi]

I am getting a similar error:

==> make bootstrap
Last 15 lines from /Users/daravi/Library/Logs/Homebrew/gfortran/02.make:
/usr/local/opt/isl/include/isl/union_map.h:225:10: note: candidate function not viable: no known conversion from 'int (isl_map *, void *)' to 'isl_stat (*)(isl_map *, void *)' for 2nd argument
isl_stat isl_union_map_foreach_map(__isl_keep isl_union_map *umap,
         ^
../../gcc/graphite-dependences.c:235:9: error: no matching function for call to 'isl_union_map_foreach_map'
  res = isl_union_map_foreach_map (x, extend_schedule_1, (void *) &str);
        ^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/local/opt/isl/include/isl/union_map.h:225:10: note: candidate function not viable: no known conversion from 'int (isl_map *, void *)' to 'isl_stat (*)(isl_map *, void *)' for 2nd argument
isl_stat isl_union_map_foreach_map(__isl_keep isl_union_map *umap,
         ^
2 errors generated.
make[3]: *** [graphite-dependences.o] Error 1
rm gcc.pod
make[2]: *** [all-stage1-gcc] Error 2
make[1]: *** [stage1-bubble] Error 2
make: *** [bootstrap] Error 2